splityard creek dam emergency action plandata.dnrm.qld.gov.au/eap/splityard-creek-eap.pdf ·...

1 SunWater template 2 Monday to Friday

EMERGENCY ACTION PLAN – SPLITYARD CREEK DAM

ISSUE: 12 Date: February 2020 Prepared by CS Energy/GHD Limited 1 Controlled Copy No:

Gated: No Manned: Yes 2

Type: Earth and rock-fill embankment

Project: Splityard Creek Dam EAP File no.: F/19/1991

Rural no.: 683 Wivenhoe Somerset Road (Power Station)

Location: Lat. -27.371944o (27°22'19"S) Lon. 152.640833o (152°38'27"E)

DISCLAIMER: This report has been produced by CS Energy to provide information for client use only. The information contained in this report is limited by the scope and the purpose of the study and should not be regarded as completely exhaustive. This report contains confidential information or information which may be commercially sensitive. If you wish to disclose this report to a third party, rely on any part of this report, use or quote information from this report in studies external to the Corporation, permission must first be obtained from the Chief Executive, CS Energy.

WIDTJ

Text Box

Approved by the delegate of the Chief Executive, Department of Natural Resources, Mines and Energy until 1 September 2021

Splityard Creek Dam - 2019/20 - i12

Splityard Creek Dam - EAP v12 Page ii

Emergency activation quick reference – Dam hazards

The Emergency Action Plan (EAP) for Splityard Creek Dam covers three emergency conditions evaluated within CS Energy’s Dam Safety Management Program. Use Table 1 to select the relevant section of the EAP that deals with the emergency condition. Note: The Incident Coordinator (IC) is responsible for activating the EAP unless otherwise directed by the Dam Safety Technical Decision Maker (DSTDM). Should the IC be unavailable, the Dam Duty Officer (DDO) is responsible.

Table 1: Emergency activation quick reference – Dam hazards

Dam hazards and section numbers

Activation levels for dam hazards

Alert Lean Forward Stand Up Stand Down

Piping: embankment, foundation or abutments See section 5

• Increasing leakage through dam embankment, foundations or abutments

• Increasing leakage through an embankment, the foundations or abutments with cloudy water • EAP activated

1. Piping condition has been established 2. Failure in progress or likely due to piping, and sufficient

water in storage to create a dam failure hazard

• Risk assessment has determined that piping risk has reduced

Earthquake See section 6

• Earthquake reported or felt in the area • Intensity less than 5 MM (using Modified

Mercalli Scale in Appendix H Figure 13

• Earthquake reported or felt in the area • Intensity greater than or equal to 5 MM, or • Intensity less than 5 MM and change

detected during surveillance inspection • EAP activated

1. Earthquake reported or felt in the area, and a possible failure path has been identified

2. Failure in progress or likely due to earthquake, and sufficient water in storage to create a dam failure hazard

• No change detected or no damage found during the inspections, or • Risk assessment has determined that

failure risk has reduced to an acceptable level • Repairs completed as necessary

Terrorist threat / activity or high energy impact See section 7

• Alert/brief received from QPS Security and Counter-Terrorism Command relevant to dam safety

1. Possible terrorist activity or suspicious behaviour noticed at the dam, threat received relevant to dam safety, and EAP activated

2. Large explosion heard/observed at the dam (e.g. bomb explosion, aircraft hit), and damage observed on the dam

3. Failure in progress or likely due to impact or explosion, and sufficient water in storage to create a dam failure hazard

• No damage found during the inspections, or • Risk assessment has determined that

failure risk has reduced • Repairs completed as necessary


Splityard Creek Dam - EAP v12 Page iv

Table of Contents Emergency activation quick reference – Dam hazards .................................................................... ii

Document control ...................................................................................................................... viii

Document revision history ........................................................................................................... ix

Controlled document distribution list ............................................................................................ x

1. References, abbreviations and definitions ........................................................................... 1

1.1 References/associated documents ................................................................................... 1

1.2 Abbreviations and acronyms ............................................................................................ 3

1.3 Business terms and definitions ......................................................................................... 4

2. Introduction ....................................................................................................................... 7

2.1 Context .............................................................................................................................. 7

2.2 Purpose ............................................................................................................................. 8

2.3 Scope ................................................................................................................................. 8

2.4 CS Energy/CleanCo provides training ............................................................................... 8

2.5 Dam emergency organisation within CS Energy/CleanCo ................................................ 9

2.6 Community information ................................................................................................... 9

2.7 Lessons Learnt ................................................................................................................. 10

2.8 Downstream notification lists ......................................................................................... 10

2.9 Comprehensive Risk Assessments .................................................................................. 10

3. Roles and responsibilities .................................................................................................. 11

4. Dam details ...................................................................................................................... 15

4.1 General dam information ............................................................................................... 15

4.2 Population at risk ............................................................................................................ 16

4.3 Spillway adequacy and reservoir water releases ............................................................ 16

4.4 General arrangement ...................................................................................................... 16

4.5 Emergency inspections and monitoring ......................................................................... 17

5. Dam hazard – Piping: embankment, foundation or abutments ........................................... 18

5.1 Overview ......................................................................................................................... 18

5.2 Emergency Actions .......................................................................................................... 18

6. Dam hazard – Earthquake ................................................................................................. 26

6.1 Overview ......................................................................................................................... 26


7. Dam hazard – Terrorist threat/activity or high energy impact ............................................. 34

7.1 Overview ......................................................................................................................... 34



Splityard Creek Dam - EAP v12 Page v

Notifications and communication lists ................................................................. 41

Flood impact downstream and inundation maps ................................................. 55

Routine and emergency access routes ................................................................. 58

Machinery and equipment .................................................................................. 60

Technical information ......................................................................................... 61

Summary of legal requirements .......................................................................... 69

Notices from local government and district groups including responses ............... 70

Emergency action plan – toolkit .......................................................................... 73


Splityard Creek Dam - EAP v12 Page vi

List of Tables Table 1: Emergency activation quick reference – Dam hazards

Table 2: Splityard Creek Dam specifications

Table 3: Piping: Embankment, foundation or abutments – DDO emergency action

Table 4: Piping: Embankment, foundation or abutments – IC emergency action

Table 5: Piping: Embankment, foundation or abutments – IC external communication plan

Table 6: Piping: Embankment, foundation or abutments –DSTDM emergency action

Table 7: Earthquake – DDO emergency action

Table 8: Earthquake – IC emergency action

Table 9: Earthquake – IC external communication plan

Table 10: Earthquake –DSTDM emergency action

Table 11: Terrorist threat/activity or high energy impact – DDO emergency action

Table 12: Terrorist threat/activity or high energy impact – IC emergency action

Table 13: Terrorist threat/activity or high energy impact – IC external communication plan

Table 14: Terrorist threat/activity or high energy impact –DSTDM emergency action

Table 15: List of machinery and equipment available during an emergency


Splityard Creek Dam - EAP v12 Page vii

List of Figures Figure 1: CS Energy / CleanCo emergency response organisation

Figure 2 Plan of the Splityard Creek Dam

Figure 3: Dam hazard – Piping: embankment, foundation or abutments flowchart

Figure 4: Dam hazard – Earthquake flowchart

Figure 5: Terrorist threat/activity or high energy impact

Figure 6: Emergency alert polygon

Figure 7: Sunny Day Failure (SDF) flood extent and PAR property locations

Figure 8 Emergency Alert Request Form

Figure 9: Modelled peak flood velocities

Figure 10: Modelled peak flood depths

Figure 11 Map of emergency access routes

Figure 12: Local Government Notice

Figure 13: Modified Mercalli Scale for earthquake magnitude assessment


Splityard Creek Dam - EAP v12 Page viii

Document control

Authorisation of document This document has been reviewed and accepted by the following:

Name Position/role Signature/date

GHD Technical Director – Prepared for Submission

See B/D/19/21075

GHD Senior Technical Director – Reviewer See B/D/19/21075

CS Energy Site Manager Wivenhoe – Prepared for submission

See B/D/19/21075

CS Energy Lead Hydro Engineer – Reviewer See B/D/19/21075

CS Energy Manager Balance of Plant – Approver

See B/D/19/21075

CS Energy Dam Safety – Approved for submission

See B/D/19/21075

CleanCo Dam Safety – Approved for submission

CleanCo Executive General Manager Transition - Approver

20/01/2020


Splityard Creek Dam - EAP v12 Page ix

Document revision history

Version Date Prepared by Reason for change

1 19/01/2001 SunWater Initial Issue

2 20/02/2002 Revision of Pt 1, Pt 2, Pt 4 and Pt 6

3 26/03/2003 Notification list revised and formatted

4 08/04/2008 Document completely revised and various changes made

5 10/11/2010 Document revised and various changes made

6 20/12/2011 CS Energy

Document substantially revised to incorporate Qld Floods Commission of Inquiry recommendations and to create Part 1 that contains Actions and Technical Data, and Part 2 that contains contact details only.

7 30/09/2013 SunWater

Revised in accordance with amendments to the Water Supply (Safety and Reliability) Act 2008 and provisional guidelines for Emergency Action Planning for Referable Dams, June 2013 as issued by DEWS. [Incorporating Amendment No 1]

8 29/09/2017 SunWater

Revised in accordance with amendments to the Water Supply Act

9 26/07/2019 GHD Document updated to incorporate dam hazard tables, activation triggers, communications plans and better align with the SunWater standard EAP.

9.1 28/11/19 CS Energy Minor updates to include change of ownership details.

10 21/01/20 CleanCo At the request of the Dam Safety Regulators office, a new version has been issued to more clearly identify the latest update to the EAP. Versions 9.1 and 10 comprise non-substantive changes, which primarily include the addition of CleanCo as the new Dam Owner, new contact details for CleanCo personnel roles within the EAP, a new figure for the Emergency Alert Polygon and corrections for minor formatting errors.

11 7/02/20 CleanCo Update the references and contact details for the CleanCo delegated EGMAM to General Manager Asset Operations. Correct email addresses for the CEO and

12 27/02/20 CleanCo Somerset CEO and Local Disaster Coordinator contact details updated.


Splityard Creek Dam - EAP v12 Page x

Controlled document distribution list

Copy no. Position Location

1 Site Manager Wivenhoe CS Energy, Wivenhoe Power Station

2 Civil Engineer - Asset Management CleanCo, Brisbane Office

3 Pool Trading Desk CleanCo, Brisbane Office

4 Director Dam Safety Department of Natural Resources, Mining and Energy, Brisbane

5 Local Disaster Coordinator – Local Disaster Management Group (LDMG)

Somerset Regional Council, Esk

6 Officer in Charge Lowood Police Station

7 District Disaster Coordinator – Ipswich District Disaster Management Group (DDMG)

Ipswich District Police Headquarters

8 Director Disaster Management Services State Disaster Coordination Centre – Queensland Fire and Emergency Services, Brisbane

9 CleanCo General Manager Asset Operations CleanCo, Brisbane Office

Notes: Communication information for each ‘Controlled Copy Holder’ is attached in Appendix A


Splityard Creek Dam - EAP v12 Page 1

1. References, abbreviations and definitions

1.1 References/associated documents

Ref. Document title Reference/location

A Water Supply (Safety and Reliability) Act 2008 https://www.legislation.qld.gov.au/view/pdf/2017-07-03/act-2008-034

B Queensland Disaster Management Act 2003 https://www.legislation.qld.gov.au/view/pdf/inforce/current/act-2003-091

C Queensland Disaster Management Guidelines http://www.disaster.qld.gov.au

D Guidelines on Selection of Acceptable Flood Capacity for Dams (ANCOLD, 2000)

ANCOLD

E Queensland Dam Safety Management Guidelines (DNRME 2002)

https://www.dnrme.qld.gov.au/__data/assets/pdf_file/0007/78838/qnrm02013.pdf

F Australian Rainfall and Runoff (ARR) 2016 http://book.arr.org.au.s3-website-ap-southeast-2.amazonaws.com/

G Emergency action plan for referable dam guideline (DNRME 2017)

https://www.dnrme.qld.gov.au/__data/assets/pdf_file/0018/84015/eap-guideline.pdf

H Queensland State Disaster Management Plan 2016 (Queensland’s Disaster Management Arrangements)

Queensland-State-Disaster-Management-Plan

I Queensland Government arrangements for coordinating public information in a crisis

https://www.disaster.qld.gov.au/dmg/st/Documents/H1159-Public-Information-Crisis-Communication-Document.pdf

J Professional Engineers Act 2002 (RPEQ) https://www.legislation.qld.gov.au/view/pdf/inforce/2013-09-23/act-2002-054

K

Guidelines for the Development of Communication Education, Awareness and Engagement Programs (Australian Institute for Disaster Resilience 2002)

https://knowledge.aidr.org.au/media/1970/manual-45-guidelines-for-the-development-of-communication-education-awareness-and-engagement-programs.pdf

L Queensland Emergency Alert Manual – M.1.174 https://www.disaster.qld.gov.au/dmg/st/Doc

uments/M1174-Queensland-Emergency-Alert-Manual.pdf

M

Business Queensland—Map and list of emergency action plans for referable dams

https://www.business.qld.gov.au/industries/mining-energy-water/water/industry-infrastructure/dams/emergency-action-plans/map

N Procedure – CS-IM-02 - Crisis Management (CS Energy)

B/D/11/43851

O Procedure – CS-IM-03 - Emergency Response Plan (CS Energy)

B/D/12/14048

P Splityard Creek Dam Safety Condition Schedule B/D/15/12897

Q Guidelines on Consequence Categories for Dams (ANCOLD, 2012)

ANCOLD ISBN: 978-0-9808192-5-0

https://www.legislation.qld.gov.au/view/pdf/2017-07-03/act-2008-034


https://www.legislation.qld.gov.au/view/pdf/inforce/current/act-2003-091

https://www.legislation.qld.gov.au/view/pdf/inforce/current/act-2003-091

http://www.disaster.qld.gov.au/



http://book.arr.org.au.s3-website-ap-southeast-2.amazonaws.com/

http://book.arr.org.au.s3-website-ap-southeast-2.amazonaws.com/



https://www.disaster.qld.gov.au/cdmp/Documents/Queensland-State-Disaster-Management-Plan.pdf




https://www.legislation.qld.gov.au/view/pdf/inforce/2013-09-23/act-2002-054

https://www.legislation.qld.gov.au/view/pdf/inforce/2013-09-23/act-2002-054





https://www.disaster.qld.gov.au/dmg/st/Documents/M1174-Queensland-Emergency-Alert-Manual.pdf







trim://B%2fD%2f12%2f14048/?db=10&view



R Guideline for Failure Impact Assessment of Water Dams (DNRME 2018)

https://www.dews.qld.gov.au/__data/assets/pdf_file/0005/78836/guidelines-failure-impact-assessment.pdf

S CS Energy Splityard Creek Dam Failure Impact Assessment August 2017

B/D/19/1591

T CS Energy Splityard Creek Dam Comprehensive Risk Assessment

Scheduled to be carried out in 2020

U Guidelines on Dam Safety Management (ANCOLD, 2003)

ANCOLD ISBN: 0-731027620

V CS Energy Inundation/Flooding of Public Roads Policy

To be developed

W Queensland Rainfall and River Conditions (BOM-Flood Warning)

http://www.bom.gov.au/qld/flood/index.shtml?ref=hdr

X CS Energy Emergency Alert Protocol Appendix A

Y CS Energy – SAP Incident Reporting & Management System

SAP

Z Procedure - WIV-MAN-13 - Incident Response (Wivenhoe Power Station)

W/D/12/1267

AA Procedure - WIV-OPS-15 - High Rainfall High Dam Water Levels (Wivenhoe Power Station)

W/D/11/111

BB Procedure - CS-TRAD-01 - Wivenhoe Power Station Water Movement Notification to SEQWater (CS Energy)

B/D/11/46292

CC Procedure - WIV-COMMS-01 - Communications Protocol with Seqwater - Water Movements (Splityard Creek Dam / Wivenhoe Dam)

B/D/12/79098

DD Standard Operating Procedures (Splityard Creek Dam) F/11/8636 (TRIM RM Folder)

EE Water Act 2000 https://www.legislation.qld.gov.au/view/pdf/2017-07-03/act-2000-034

FF Manual - Operation and Maintenance (Splityard Creek Dam)

W/D/13/644

GG

Somerset Regional Council Local Disaster Management Plan v2 August 2009

http://www.floodcommission.qld.gov.au/__data/assets/pdf_file/0018/7713/QFCI_Exhibit_324_-_Somerset_Regional_Council_Local_Disaster_Management_Plan.pdf

HH Ipswich District Disaster Management Plan v1 January 2019

https://www.police.qld.gov.au/RegionalPolicing/southern/Documents/IpswichDDMP.pdf






trim://W%2fD%2f12%2f1267/?db=10&view
















1.2 Abbreviations and acronyms AEI Asset Engineer infrastructure AEP Annual Exceedance Probability AHD Australian Height Datum AMTD Adopted Mean Thread Distance ANCOLD Australian National Committee on

Large Dams BOM Bureau of Meteorology CEO Chief Executive Officer CRA Comprehensive Risk Assessment CSE CS Energy CSTN Counter Security & Terrorism Network D/S Downstream DCF Dam Crest Flood DCL Dam Crest Level DDC District Disaster Coordinator DDMG District Disaster Management Group DDMP District Disaster Management Plan DDO Dam Duty Officer DDS Director Dam Safety DNRME Department of Natural Resources,

Mines and Energy DSR Dam Safety Regulator DSSP Dam Safety Services Provider DSTDM Dam Safety Technical Decision Maker EAP Emergency Action Plan EA Emergency Alert EER Emergency Event Report EGMAM Executive General Manager Asset

Management (General Manager Asset Operations, CleanCo)

EGMPO Executive General Manager Plant Operations (Executive General Manager Transition, CS Energy)

EL Elevation Level FCL Fixed Crest Level FSL Full Supply Level IC Incident Coordinator IFHC Incremental Flood Hazard Category LB Left Bank LDMG Local Disaster Management Group LDMP Local Disaster Management Plan MBP Manager Balance of Plant (Transitions

Project Manager, CleanCo) Max. OL Maximum Operating Level ME Manager Environment MM Modified Mercalli

O&M Operation & Maintenance OB Observation Bore ORR Owners Regional Representative PAR Population at Risk PFRM Predictive Flood Routing Model PMF Probable Maximum Flood PMP Probable Maximum Precipitation PMPDF Probable Maximum Precipitation

Design Flood PTD Physical Trading Desk QDMC Queensland Disaster Management

Committee QFES Queensland Fire & Emergency Services QPS Queensland Police Service RB Right Bank RDMG Relevant Disaster Management Group RPEQ Registered Professional Engineer of

Queensland RSL Reduced Supply Level SCTN Security & Counter Terrorism Network SDCC State Disaster Coordination Centre SDC State Disaster Coordinator SDCG State Disaster Coordination Group SDF Sunny Day Failure SES State Emergency Service SMS Short Message Service SO Standby Operator SOP Standard Operating Procedure SWL Storage Water Level U/S Upstream WHS Workplace Health & Safety WQ Water Quality Wivenhoe Power Station HDO Hydro Duty Officer LEH Lead Engineer Hydro PS Production Supervisor SMW Site Manager Wivenhoe WAM Wivenhoe Asset Management WWE Wivenhoe Work Execution



1.3 Business terms and definitions Terms used in this section have the meaning as set out in accordance with relevant legislation or as defined by operator requirements.

Term Definition

Dam Hazard Means a reasonably foreseeable situation or condition that may: • cause or contribute to the failure of the dam, if the failure may cause harm to

persons or property

Dam Hazard Event Means an event arising from a dam hazard if: • persons or property may be harmed because of the event, AND • a coordinated response, involving the following relevant entities, is unlikely to be

required; local group and district group for the EAP, local government chief executive, another entity the owner of the dam considers appropriate, AND

• the event is not an emergency event.

Disaster Management Plan (DDMP or LDMP)

Of a district group or local government, means the group’s or local government’s disaster management plan under the Disaster Management Act 2003.

District Group (DDMG) For an emergency action plan (EAP), means a district group established under the Disaster Management Act 2003, section 22 whose disaster district under that Act could, under the plan, be affected by a dam hazard.

Emergency Event Means an event arising from a dam hazard if: • persons or property may be harmed because of the event, AND • any of the following apply:

o a coordinated response, involving the following relevant entities, is likely to be required; local group and district group for the EAP, local government chief executive, another entity the owner of the dam considers appropriate, OR

o the event may arise because of a disaster situation declared under the Disaster Management Act, OR

o an entity performing functions under the State disaster management plan may, under that plan, require the owner of the dam to give the entity information about the event.

Local Group (LDMG) For an EAP, means a local group established under the Disaster Management Act 2003, section 29 whose local government area could, under the plan, be affected by a dam hazard.

Notice Response A dam owner’s written response to a notice following an assessment of an EAP by a local government or district group.

Referable Dam A dam, or a proposed dam after its construction, will be a referable dam if: • a failure impact assessment of the dam, or the proposed dam, is carried out under

the Act, AND • the assessment states the dam has, or the proposed dam after its construction will

have, a category 1 or category 2 failure impact rating, AND • the chief executive has, under section 349 of the Act, accepted the assessment. Also, a dam is a referable dam if: • under section 342B of the Act, the owner of a dam is given a referable dam notice

and, before the effective day for the notice, does not give the chief executive a failure impact assessment for the dam, AND



Term Definition • the chief executive has not, under section 349 of the Act, accepted a failure impact

assessment of the dam.

Relevant Entity Means each of the following under the EAP for the dam: • the persons who may be affected, or whose property may be affected, if a dam

hazard event or emergency event were to happen for the dam, e.g. the owners of parcels of farm land adjacent to the dam or residents of a township

• local group and district group for the EAP • local government whose local government area may be affected if a dam hazard

event or emergency event were to happen • the chief executive • another entity the owner of the dam considers appropriate, e.g. the Queensland

Police Service.

Terms consistent with Queensland Disaster Management Arrangements (reference C)

Activation Levels The four levels of EAP activation are: • Alert – A heightened level of vigilance due to the possibility of an event

occurring. No further action may be required; however, the situation should be monitored by someone capable of assessing the potential of the threat. Moving to an Alert level indicates the dam owner is getting ready to activate the Lean Forward level of the EAP if the situation deteriorates.

• Lean Forward – An operational state characterised by a heightened level of situational awareness of an impending disaster event and a state of operational readiness. Disaster coordination centres are on standby and prepared but not activated.

• Stand Up – The operational state where resources are mobilised, personnel are activated, and operational activities commenced. Disaster coordination centres are activated. The dam owner needs to provide an ‘Emergency Event Report’ (EER) in accordance with the provision of the Act.

• Stand Down – Transition from responding to an event back to normal core business and/or continuance of recovery operations. There is no longer a requirement to respond to the event and the threat is no longer present.

Notes: The movement through these levels of activation is not necessarily sequential. It should be applied with flexibility and adaptability and be tailored to the location and event. Triggering one of these levels of activation may not necessarily mean a similar activation of the LDMG or DDMG.

Dam Crest (reference D)

The lowest elevation of the non-overflow crest section of the dam excluding handrails, parapets or wave walls that have not been designed to store water.

Dam crest flood (reference D)

The lowest elevation of the non-overflow crest section of the dam excluding handrails, parapets or wave walls that have not been designed to store water.

Dam Failure Dam failure is the physical collapse of all or part of a dam or the uncontrolled release of any of its contents.

Downstream releases Downstream releases are outflows from the dam made through appurtenant structures such as spillways or outlet works that are in accordance with the design of the dam.



Term Definition

Earthquake A sudden release of energy in the Earth's crust or upper mantle, usually caused by movement along a fault plane or by volcanic activity, resulting in the generation of seismic waves that can be destructive. The potential consequences of an earthquake include: • settlement, sliding, or overturning of monoliths in the dam wall • initiation of seepage lines in the foundations or abutments that could lead to piping

damage and potential inoperability of appurtenant works.

Flood Release A flood release from a dam occurs when catchment inflows raise the storage level above the Full Supply Level (FSL) resulting in a discharge from the spillway of the dam.

Piping Internal scour caused by the water flow and seepage that occurs through earth dams, dam foundations or dam abutments. The internal scour can lead to the formation of a pipe which can lead to a failure of the dam.

Plane strike or other impact

The impact of a plane, meteor or other high energy item on or in close vicinity of a dam could damage the dam structure or create a wave that could overtop the dam.

Probable maximum flood (reference E)

The flood resulting from the probable maximum precipitation coupled with the worst flood-producing catchment conditions that can be realistically expected in the prevailing meteorological conditions.

Probable maximum precipitation (reference E)

The theoretical greatest depth of precipitation for a given duration that is physically possible over a particular drainage basin.

Probable maximum precipitation design flood (reference F)

The flood resulting from the probable maximum precipitation coupled with typical catchment conditions.

Stability, main embankment dam

High foundation pore pressure peaks may reduce the Factor of Safety against slip circle failure to an unacceptable level.

‘Sunny day’ failure (SDF)

A failure that occurs at the FSL and there is no concurrent rain associated flooding.

Terrorist activity A deliberate attempt to damage, fail or contaminate a dam.



2. Introduction

2.1 Context Under the Water Supply (Safety and Reliability) Act 2008 (the Act), the owner of a referable dam must have an approved EAP for the dam. Referable dams, by definition, would put lives at risk if they were to fail.

This EAP has been prepared in accordance with Chapter 4 of the Act. The content requirements for EAPs are contained in section 352H of the Act.

Summary of legal requirements – Section 352H Section 352H(1) of the Act requires that the EAP must identify each dam hazard for the dam ; and for each of these dam hazard types (e.g., flood operations, or chemical spill/toxic conditions): 1. identify the area likely to be affected by a dam hazard event or emergency event arising from the dam hazard;

and 2. identify each circumstance that indicates a material increase in the likelihood of the dam hazard event or

emergency event happening; and 3. state when and how the owner of the dam plans to warn persons who may be harmed, or whose property

may be harmed by an event caused by the dam hazard, if one happens, and/or there is a material increase in the likelihood of an occurrence, including the order of priority in which the persons or categories of persons are to be warned; and

4. state when and how the owner plans to notify the relevant entities for the dam, if a dam hazard event or emergency event happens or, there is a material increase in the likelihood of such an occurrence, including the order of priority in which the relevant entities are to be notified; and

5. state the actions the owner of the dam plans to take in response to a dam hazard event or emergency event. In accordance with section 352H(2) of the Act, the EAP may provide for the dam owner to make arrangements with a relevant entity for warnings to be given by the relevant entity on behalf of the dam owner in appropriate circumstances. Section 352HA of the Act states that before giving the chief executive an EAP, the owner of the dam must give a copy of the plan to each local government whose area may be affected by a dam hazard identified in the plan; and each district group for the plan. Section 352HB of the Act states that the local government must assess the EAP for consistency with its disaster management plan. In its assessment, the local government must consult with the local district group for the plan. Within 30 business days of receiving the EAP, the local government must give the owner of the dam a notice, which states whether it considers the plan is consistent with its disaster management plan; and if not, give reason why it considers the EAP is not consistent. The EAP must include any such notices, provided to the owner of the dam by a local government (or district group); and any responses which the owner gives to these notices. Section 352H(1) further stipulates that an EAP must include any other relevant matter prescribed by regulation. The local government whose area may be affected by a dam hazard for Splityard Creek Dam has been determined as Somerset Regional Council. CS Energy has provided the Somerset Regional Council with a copy of the draft EAP for assessment. Section 352HC of the Act states that a district group may review the EAP for consistency with its disaster management plan. The district group for Splityard Creek Dam is Ipswich DDMG. CS Energy has provided the DDMG with a copy of the draft EAP for review.

Note: CS Energy has attempted to write the EAP to cope with all reasonably foreseeable emergencies. However, there is considerable uncertainty about how any emergency might develop and progress. Factors such as the weather, the location, the mechanics, and the rate and size of any actual failure can considerably affect any resulting flood discharges. Therefore, a significant number of assumptions have had to be made in compiling sections of the EAP. Some variation in outcome should be expected where the event differs from the assumed behaviour.



2.2 Purpose The purpose of this EAP is -

• to minimise the risk of harm to persons or property if a dam hazard event or emergency event for the dam happens

• to identify dam hazards that could occur at Splityard Creek Dam and the area likely to be affected for each hazard

• to prescribe emergency actions taken by the dam owners and operating personnel in identifying and responding to dam hazards and notifying relevant entities.

It is possible for more than one dam hazard to exist at Splityard Creek Dam at the same time. In such a circumstance, it may be necessary to act on the procedures within separate sections simultaneously.

The focus of this EAP is the management of dam hazards at Splityard Creek Dam by the owner of the dam (CleanCo) and the communication and notification of dam hazards to the LDMG, DDMG and broader community. However, the EAP sits within the broader emergency response framework. This EAP has been assessed and considered to be consistent with a future inclusion in the Somerset LDMP.

2.3 Scope The Splityard Creek Dam EAP covers -

• dam hazards evaluated within CS Energy’s Dam Safety Management Program • details about the dam that are relevant to a dam hazard • identification of circumstances that indicates a material increase in the likelihood of a dam hazard event or

emergency event • triggers for activation of a tiered response to a dam hazard event or emergency event • roles and responsibilities in responding to a dam hazard event or emergency event • notification, warning, and communication protocols • inspection, monitoring, and reporting protocols during emergencies (reference I) • other relevant information that may assist with identifying the area affected by a dam hazard event or

emergency event

2.4 CS Energy/CleanCo provides training Training of the use and implementation of this EAP document is carried out at various times throughout the year, but specific pre-wet season training is undertaken at Wivenhoe Power Station (or convenient location of stakeholders, i.e. Fernvale) in the months leading up to the wet season.

EAP training that is carried out on-site includes walkthroughs of new changes, scenario (role play) and Q & A to check the knowledge and competency of all those who attended. This on-site training is presented to relevant CSE staff (DDOs and ICs) and disaster management stakeholders. DSTDM information sessions are carried out once a year with the same walkthrough of new changes and Q & A. New employees for EAP various roles will also have a walkthrough of the EAP to understand soon after commencing work with CSE/CleanCo.

EAP training includes walkthroughs of new changes, scenario (role play) and Q & A to check the knowledge and competency of all those who attended. This training is presented to relevant CSE/CleanCo staff (DDOs and ICs) and disaster management stakeholders. DSTDM information sessions are carried out once a year with the same walkthrough of new changes and Q & A for the Dam. New employees to the EAP various roles will have a walkthrough and training on the EAP soon after they start work at CSE/CleanCo.

CSE/CleanCo is also working towards carrying out an EAP exercise annually involving each local authority and disaster management stakeholders. This exercise would involve the SDCC and include the (non-live) testing of Emergency Alerts.



2.5 Dam emergency organisation within CS Energy/CleanCo The CS Energy emergency management framework generally utilises the organisation’s hierarchy and in-house experts as illustrated in Figure 1 below.

Figure 1: CS Energy/CleanCo emergency response organisation

Key aspects of the emergency management framework are:

• Central to the framework is the role of IC for any dam hazard at a dam. The IC will maintain overall responsibility for a coordinated response to the dam hazard incident.

• The IC is responsible for activating the EAP when the dam reaches an EAP activation level, unless instructed to activate by the DSTDM who has determined that it is reasonable likely that the dam could reach an EAP activation level. Should the IC be unavailable, the DDO is responsible for the activation. If the IC loses all communications during a dam hazard, then as a fail-safe position, the DDO will assume the duties and responsibilities of the IC. However, loss of communications could result in some communication processes defined in this EAP not being carried out.

• CSE/CleanCo and/or its DSSP (includes DSTDM) and technical staff will provide technical advice to the IC and DDO on an as needs basis. The DSTDM will also make flood and dam engineering decisions during a dam hazard. These roles are filled by RPEQs (or by experienced engineers under the direct supervision of an RPEQ) and are suitably qualified professionals as defined in reference J. Such advice will be provided within an established framework of SOPs, models, standards and manuals.

2.6 Community information Applying reference K, CSE/CleanCo with the assistance of the local council will ensure community education around messaging and impacts of the EAP and its related events is undertaken and continually improved by incorporating actions from lessons learnt (Section 2.7).



CSE/CleanCo provides information externally to customers, D/S residents and the community in a range of methods or channels in relation to Dam hazards and Emergencies. In future, individuals may be able to access information through Facebook, Twitter and the CleanCo web page. Immediately D/S residents are also provided information in text message/phone calls in the event of an activation of this EAP. In the event of an emergency event or when otherwise required, CSE/CleanCo and the affected Local Government will use the National Emergency Alert System to send a voice message and SMS in accordance with reference L. This service is provided by Telstra and managed by QFES at the SDCC. A copy of the CleanCo approved EAP is available to the public on the Business Queensland website, reference M. These copies are redacted to protect people’s personal details.

2.7 Lessons Learnt CSE/CleanCo will carry out Lessons Learnt workshops as part of its post event management. These Lessons Learnt can result in changes to the EAP. These will be captured and, if applicable to this document, will be implemented at the earliest opportunity and are made available in the next EAP update to the DSR as part of CS Energy’s continual improvement of its EAPs. The Lessons Learnt actions, if relevant, will be provided to stakeholders, such as the LDMG, DDMG, other dam owners and DNRME as appropriate. In addition, CSE/CleanCo requests any post event learnings be communicated regarding operational effectiveness and areas for improvement.

2.8 Downstream notification lists CS Energy has compiled the notification lists through an iterative process. At least annually, CS Energy confirms contact details for all landholders that are impacted in the downstream zones.

2.9 Comprehensive Risk Assessments A Comprehensive Risk Assessments (CRA) will be carried out on Splityard Creek Dam in the near future. This is a technical report that is utilised to ascertain risks for the dam as the basis for emergency triggers. The CRA will be made available to disaster management personnel whom require further assurance around the findings. To obtain a copy of a relevant CRA a request should be made in writing to CleanCo General Manager Asset Operations. It should detail the reason for the request and indicate who will be interpreting the data, i.e. engineering capability, for any unqualified personnel.



3. Roles and responsibilities

Roles and responsibilities Position holder 3

Owner (CleanCo, CS Energy interim Operator) • Liaise with the Board and Minister • Activate CSE/CleanCo Crisis Management Procedure (reference N), if required • Ensure necessary resources are available to manage any event • Maintain an up to date list of immediately D/S residents (Appendix A4 and Appendix

A5) of Splityard Creek Dam. The flood extent is indicated in the drawing in Appendix A7 • At all times, aim to provide timely advice and support to the LDMG in the affected local

government area and the DDMG in the affected disaster district • During a dam hazard event that occurs with little or no warning, undertake the

following actions to ensure the community is informed as soon as possible: o notify the residents listed in Appendix A4 and Appendix A5 via SMS o contact SDCC Watch Desk to request an Emergency Alert campaign throughout

the Splityard Creek Dam Emergency polygon o During a dam hazard event that occurs with adequate warning; notify the

residents listed in Appendix A4 and Appendix A5 via SMS, unless otherwise agreed with the LDMG

• Record communications, notifications and observations as required

CEO

EGMAM EGMPO

SMW

Owner’s Head Office Representative • Authorise the issuing of EAP, SOPs and O&M Manual and Amendments • Facilitate Dam Safety Training Courses for CS Energy dam operations staff and other

staff as appropriate, and ensure that all staff required to undertake Dam Safety work are trained and accredited

• Ensure that risks identified in the CRA or other technical reports undertaken in relation to Dam Safety are Included in the EAP

• Ensure visual inspections and instrumentation monitoring frequencies conform to ANCOLD Guidelines

• Ensure all Dam Safety work orders, work instructions and lesson learned outcomes are fully implemented

• Ensure requirements of the Dam Condition Schedule (reference P) are met • Ensure the work instructions are correct and the Log Books, SOPs, Data Books, and

EAPs are reviewed annually as per reference P • Ensure the 5 yearly Comprehensive Inspections and their Reports are completed by

suitably qualified personnel within the time specified in reference P and that work orders are created for recommendations and work is undertaken as required

• Ensure Annual Inspections and their reports are completed by suitably qualified personnel within the time frames specified in reference P and that work orders are created for recommendations and work is undertaken as required

• Ensure the Dam Safety Instrumentation Data is reviewed and evaluated by suitably qualified personnel to verify the structural integrity of the dams on a regular basis and maintain a spread sheet for verification for audit and quality control

MBP AEI

3 May be undertaken by one person, or jointly between the following personnel, depending on availability and/or emergency event




• Record communications, notifications and observations as required

Owners Regional Representative (ORR) • Liaise with the Lead Engineer Hydro and Production Supervisor, WAM, WWE • Arrange dam specific training and accreditation for relevant staff • Ensure competent, trained and accredited personnel operate the storages • Undertake the role of IC as required:

o Liaise with the Local Disaster Coordinator or proxy o Activate the EAP, when necessary o Ensure the EAP is implemented appropriately and carry out the IC role as

required • Ensure all work orders, work instructions and lesson learned outcomes are fully

implemented. • Record communications, notifications and observations as required

SMW LEH PS

Dam Safety Technical Decision Maker (DSTDM) • Analyse the situation and provide expert technical advice in relation to Dam Safety • Discuss Dam Hazard with peers and other technical experts and make sound decisions

to mitigate the risk • Determine response to incidents and emerging issues • Issue warning on dam failure and advise on protective measures • Ensure the EAP is implemented appropriately and carry out the DSTDM role as

required • Liaise with DSR as required • Record communications, notifications and observations as required

Various personnel

as per DSTDM roster

CleanCo Media Team • Analyse sensitive issues, discuss with the Owner and issue media releases • Handle public and customer comments (including social media) and advise the Owner

if necessary • Liaise with the IC and update QDMC of flood events • Record communications, notifications and observations as required

Various personnel

as per Media Team roster

Incident Coordinator (IC) • Notify LDMGs, or councils if LDMGs not Stood Up, of intent to use the Emergency Alert

(EA) • Activate the EAP, when necessary • Ensure the EAP is implemented appropriately and carry out the IC role as required • Arrange Situation Reports and determine frequency, as required • Record communications, notifications and observations as required

SMW LEH PS

Dam Duty Officer (DDO) • Complete accreditation to operate and maintain relevant storage • Ensure the EAP is implemented appropriately and carry out the DDO role as required • Take direction from the DSTDM and IC as requested • Arrange immediate site inspection and make informed assessment of the situation

Various personnel as per DDO roster




• Escalate any issue not covered in the EAP or where actions are not clear • Record communications, notifications and observations as required

Council Councils have legislated local government functions, as per Section 80 of reference B. These include: • Ensure it has a disaster response capability • Approve its local disaster management plan • Ensure information about an event or a disaster in its area is promptly given to the

DDMG for the disaster district in which area it is situated • Perform other functions given to the local government under reference B

Somerset

Regional Council

Queensland Police Service (QPS) Manage the initial situation based on local operational procedures; including but not limited to: • Conduct emergency operations • Coordinate and support CSE/CleanCo during a declared emergency at the dam • Liaise with relevant organisations • Evacuation of persons if required • Control of essential traffic • Security of specific area

Local Police

Disaster Management Groups/Personnel – (In addition to requirements outlined in reference B) LDMG • As per IGEM review recommendation; work together with CSE/CleanCo and the

Council to ensure community education around messaging and impacts of EAP related events is undertaken and continually improves

• Work with the Council and CSE/CleanCo to ensure the EAP is regularly exercised • Identify and coordinate the use of resources and support services that may be required

for an EAP event, noting that for safety events unique to the dam, CSE/CleanCo will approach councils to initiate

• During a dam hazard event, providing they are Stood Up, the LDMG in the affected local government area will take the lead role in notifying the broader community

• Identify and provide advice to the relevant DDMG about support services required by the LDMG to manage an EAP event

• Provide reports and make recommendations to the relevant DDMG about matters relating to EAP events

QFES • Work with dam owner and LDMG to ensure Emergency Alert polygons are prepared,

stored and tested at the State Watch Desk And as per Section 352HC of the Act: DDMG • May review the EAP for consistency with the DDMP

LDMG QFES

DDMG

Dam Safety Regulator (DSR)




• Liaison with relevant Minister on necessary actions • Approve this document as required under legislation • Liaise with chief executive as required in administering (regulating) the Act

DSR



4. Dam details

4.1 General dam information Location: Splityard Creek Dam is located approximately 70 km northwest of Brisbane on the Pryde Creek at a distance of 8.6 km upstream from the confluence of Pryde Creek and the Brisbane River. Purpose: Splityard Creek Dam is owned by CleanCo and operated by CS Energy under a transitional agreement. It is the upper storage pond for a pumped storage hydroelectric facility. Catchment: The catchment and upstream geography is only 3.6 km2 and is stable. Annual average rainfall is 1050 mm. Special consideration of upstream areas is not required.

Construction: The earth and rockfill dam was constructed in 1983 as an off-stream storage. A small saddle dam is located on the northern side of the reservoir rim.

Specification: Table 2 below lists general specifications of Splityard Creek Dam. Table 2: Splityard Creek Dam specifications

Description Specification

Dam type Zoned earth and rockfill embankment with central clay core

Full Supply Level (FSL) EL 166.5 m

Design Operating Range EL 133 m – EL 166.5 m

Dam Crest Level (DCL) EL 168.0 m

Storage capacity at FSL 28,700 ML

Storage area (at FSL) 104 ha

Maximum embankment height 76 m

Total length 1,120 m

Spillway type Open trapezoidal channel with a 1.0 m high concrete sill wall control structure

Spillway crest level EL 166.5 m

Spillway crest width 190.4 m

Spillway Capacity at PMF (EL 167.6 m) 420 m3/s

Outlet works 28 m high intake tower with 900 mm MSCL outlet pipe housed in a reinforced concrete outlet conduit

Outlet control 450 mm & 200 mm butterfly valves housed in the valve house at the toe of main embankment

Minimum draw down level through outlet works

EL 108.5 m

Saddle Dam type Zoned earth and rockfill embankment with central clay core

Saddle Dam Crest Level EL 168.0 M

Saddle Dam length 159 m

Saddle Dam maximum height 10 m

All levels are to Australian Height Datum, AHD. Conversion from State Datum is AHD (in metres) = State Datum RL (in feet) x 0.3048 - 0.03 m



4.2 Population at risk In accordance with references Q, R and S:

• Splityard Creek Dam has a Category 1 Failure Impact Rating • the estimated maximum PAR for a Sunny Day Failure (SDF) of Splityard Creek Dam is 47

4.3 Spillway adequacy and reservoir water releases The spillway is not located near the dam wall. Water released via the spillway would only occur, if the hydroelectric power station control system failed to stop the pumps, or in an extreme rainfall event when water is not released through the Hydro Power Station. In these events, released water would be discharged into a gully that flows via Branch Creek into Wivenhoe Lake, not into the original watercourse. There is a road bridge and property along Branch Creek. However, a preliminary assessment indicated that the waterway area below the bridge contains adequate capacity to pass any discharge from the spillway, either by a Power Station pumping control failure or an extreme rainfall event. There are no buildings close to the waterway of Branch Creek; therefore, there is no population at risk (PAR) for spillway discharge only.

Normal releases of water from the dam are through the power station into Wivenhoe Lake, not down the original watercourse.

The outlet works consist of a 28 m high intake tower with a 900 mm MSCL outlet pipe housed in a reinforced concrete outlet conduit, which passes through the main embankment dam. Water released via the outlet works discharge pipe is not considered to constitute a credible hazard downstream, as the flow level in Pryde Creek would be only marginally increased.

4.4 General arrangement An aerial survey view of the dam is included in Figure 2. The general arrangement and other drawings are in Appendix E.

Figure 2 Plan of the Splityard Creek Dam

Main dam

Spillway

Saddle dam

Wivenhoe Hydro Power Station

Wivenhoe Dam storage

Splityard Creek Dam storage



4.5 Emergency inspections and monitoring The Splityard Creek Dam has been designed to conform to modern design standards, so that its failure is highly unlikely. To maintain the dam in a safe condition and detect any dam hazard, as soon as it begins to develop, or becomes apparent, the following is applicable to the Dam.

4.5.1 Inspections

• Routine Visual Inspection: Conducted as per reference FF or as directed by the DSTDM • Detailed Inspection: Conducted annually • Comprehensive Inspection: Conducted 5-yearly

4.5.2 Instrumentation and monitoring

To confirm the structural behaviour and safety of the embankment, the following Instrumentation was installed, and is monitored, at Splityard Creek Dam:

• Water Level and seepage measurement o 39 hydraulic piezometers to monitor pressure distribution through the embankment dam and its

foundations. o 47 groundwater observation bores to monitor for any variations in the level of the phreatic

surface. o 9 measuring weirs to monitor seepage from the embankment foundations and other parts of the

dam. • Settlement/movement measurement

o 35 movement points used to monitor the embankment surface both vertically (Z direction) and horizontally (X and Y directions).

o 4 inclinometers to monitor any movement within the embankment dam and/or its foundation. o 8 extensometers installed in the core of the embankment where the axis deflects 37 degrees

upstream and passes over a high knob in the topography. The purpose of these extensometers was to detect any movement of the embankment downstream, as well any transverse cracking caused by differential settlement of the embankment across the knob.

The location of instrumentation and monitoring equipment is in the drawing in Appendix E.



5. Dam hazard – Piping: embankment, foundation or abutments

5.1 Overview The emergency action described in this section relates to a potential dam failure hazard due to a piping condition through the main embankment dam, foundations or abutments. An early indicator of a piping condition can be an increase in seepage or a new area of seepage. If the seepage water is cloudy or has become cloudy this may indicate that material is being transported and a pipe is being established.

If a pipe is established and progresses, then a dam failure may result. If a potential pipe is detected early remedial repairs maybe possible in the form of constructing a filter and weighting zone over the pipe exit if safe to do so.

The area likely to be affected by this emergency event is described as:

• if dam failure does not occur then there will not be any area affected • if dam failure does occur then the maximum area affected area is the level shown by the Sunny Day Failure

(SDF) line on the maps in Appendix B.

5.2 Emergency Actions Table 3 to Table 6 specify emergency actions for the following roles:

• DDO • IC • DSTDM



Figure 3: Dam hazard - Piping: embankment, foundation or abutments flowchart



Table 3: Piping: Embankment, foundation or abutments – DDO emergency action

Activation level Alert Lean Forward Stand Up 1 Stand Up 2 Stand Down

Activation trigger • Increasing leakage through dam embankment, foundations, abutments, v-notches and/or any new area

• Increasing leakage through an embankment, the foundations, abutments, v-notches and/or any new area with cloudy water • EAP activated

• Piping condition has been established

• Failure in progress or likely due to piping, and • Sufficient water in storage to create

a dam failure hazard


Actions • Monitor and record flows every 6 hours (or as otherwise instructed by the DSTDM) until a decreasing trend is observable or as directed by the IC • Liaise with the DSTDM following

each inspection • Maintain photographic record and

send to DSTDM following each inspection • Notify SO • Log Book entry

• As per previous activation level, plus: • Complete and send the Inspection

Sheet to DSTDM following each inspection

• As per previous activation level, plus: • Support/supervise remedial works

as required, if safe to do so • Instruct others to lower the storage,

if directed or considered necessary • Consider closing any affected roads,

if not already closed by others

• As per previous activation level, plus: • Vacate the immediate vicinity of the

piping condition • Instruct others to lower the storage,

if not already instructed • Liaise with IC and DSTDM re

potential for evacuations

• Forward information for EER to IC • Log Book is to be updated • Return to routine activities

Internal Notifications

• DSTDM • IC • SO

• As per previous activation level • As per previous activation level • As per previous activation level • As required

External Notifications

• Nil • Nil • Nil • Nil • Nil

ALL ACTION MUST BE TAKEN WHEN IT IS SAFE TO DO SO eg taking photographs/video, dam inspections, instrument readings. ALL PHOTOS MUST BE DATE STAMPED



Table 4: Piping: Embankment, foundation or abutments – IC emergency action


Activation trigger

• Increasing leakage through dam embankment, foundations, abutments, v-notches and/or any new area






Actions • Liaise with DDO and DSTDM re situation

• As per pervious activation level, plus: • Activate EAP • Liaise with the Police and LDMG re

situation • Investigate availability of machinery

and materials (if insufficient stockpiles available) • Place machinery operators on

standby if directed by DSTDM • Complete Situation Report, unless

otherwise directed • Complete Incident and Near Miss

Alert

• As per previous activation level, plus • Mobilise resources to undertake

remedial works, if directed by DSTDM • Liaise with Police and LDMG

regarding potential road/bridge closures, if directed by DSTDM • Send D/S Residents landline voice

and SMS messages • Complete Emergency Alert Request

Form and send to SDCC Watch Desk • Follow up with phone call to SDCC

to ask that Splityard Creek Dam Emergency Polygon is activated

• As per previous activation level, plus • Liaise with DDO, DSTDM, Police

and LDMG re potential for evacuations

• Deactivate EAP • Compile EER and organise delivery

to the Regulator within 30 days of the completion of the event • Complete Situation Report (final) • Return to routine activities


• DDO • DSTDM

• As per previous activation level, plus • Incident and Near Miss Alert • CleanCo Communications Team

• As per previous activation level • As per previous activation level • Inform previous notifications of EAP deactivation and stand down


• As required • Police • LDMG

• As per previous activation level, plus • SDCC Watch Desk • D/S Residents

• As per previous activation level • Inform previous notifications of EAP deactivation and stand down





Activation level

Trigger for communications Group to contact Method Message code

Message text

Alert • Increasing leakage through dam

embankment, foundations, abutments, v-notches and/or any new area

Internal communications only

Lean Forward

• Increasing leakage through an embankment, the foundations or abutments v-notches and/or any new area with cloudy water

• EAP activated

1. Police 2. LDMG

Phone & Email

Piping 1 Describe current situation with Dam: What is the event (Dam safety risk - piping) What is the status (Unconfirmed piping/leakage – Investigation continues) Advise EAP has been activated Advise current storage level Advise any issues you are aware of Police and LDMG to standby for further advice

Incident and Near Miss Alert SAP System Splityard Creek Dam – Unconfirmed piping risk

• Weekly update (if applicable) 1. Police 2. LDMG

Email Piping 1 CLEANCO EMERGENCY NOTIFICATION DAM: SPLITYARD CREEK EVENT: DAM SAFETY RISK – PIPING STATUS: UNCONFIRMED PIPING / LEAKAGE – INVESTIGATION CONTINUES STORAGE WATER LEVEL: XXXX.XX m AHD ACTION: Standby for further advice

Stand Up 1

• Piping condition has been established 1. D/S Residents Landline Voice Message & SMS

Piping 2 CLEANCO EMERGENCY NOTIFICATION DAM: SPLITYARD CREEK EVENT: DAM SAFETY RISK – PIPING STATUS: CONFIRMED PIPING/LEAKAGE ACTION: POSSIBLE ISSUE AT DAM, LISTEN FOR FURTHER ADVICE

• 2. Police 3. LDMG

Phone & Email

Piping 2 Describe current situation with Dam: What is the event (Dam safety risk - piping) What is the status (Confirmed piping/leakage) Advise current storage level and discuss any road/bridge closures Advise any issues you are aware of LDMG and Police to prepare for possible evacuations

4. SDCC Watch Desk Email & Phone

Piping 2 Complete Emergency Alert Request Form and send to SDCC Watch Desk Follow up with phone call to ask that Splityard Creek Dam Emergency Polygon is activated Message as shown above for D/S Residents

Incident and Near Miss Alert SAP System Splityard Creek Dam – Piping established. Failure possible but not in progress




Activation level


Message text

Stand Up 2

• Failure likely due to piping, and • Sufficient water in storage to create a

dam failure hazard

1. D/S Residents Landline Voice Message & SMS

Piping 3 CLEANCO EMERGENCY NOTIFICATION – URGENT DAM: SPLITYARD CREEK EVENT: DAM SAFETY RISK – PIPING STATUS: DAM FAILURE LIKELY ACTION: POSSIBLE EVACUATION, FOLLOW INSTRUCTIONS OF EMERGENCY SERVICES

2. Police 3. LDMG

Phone Piping 3 Describe current situation with Dam: What is the event (Dam safety risk - piping) What is the status (Possible dam failure) Advise current storage level and discuss any road/bridge closures LDMG and Police to prepare coordinated evacuations


Piping 3 Complete Emergency Alert Request Form and send to SDCC Watch Desk Follow up with phone call to ask that Splityard Creek Dam Emergency Polygon is activated Message as shown above for D/S Residents

Incident and Near Miss Alert SAP System Splityard Creek Dam – Piping failure likely

• Dam failure in progress, and • Sufficient water in storage to create a

dam failure hazard


Piping 4 CLEANCO EMERGENCY NOTIFICATION – URGENT DAM: SPLITYARD CREEK EVENT: DAM SAFETY RISK – PIPING STATUS: DAM FAILURE IN PROGRESS ACTION: MOVE TO HIGHER GROUND

2. Police 3. LDMG

Phone Piping 4 Describe current situation with Dam: What is the event (Dam safety risk - piping) What is the status (Dam failure in progress) Advise current storage level LDMG and Police to coordinate evacuations of affected Downstream Residents


Piping 4 Complete Emergency Alert Request Form in and send to SDCC Watch Desk Follow up with phone call to ask that Splityard Creek Dam Emergency Polygon is activated Message as shown above for D/S Residents




Activation level


Message text

Incident and Near Miss Alert SAP System Splityard Creek Dam – Piping failure in progress

Stand Down


1. D/S Residents (If from Stand Up)

Landline Voice Message & SMS

Piping 5 CLEANCO EMERGENCY NOTIFICATION DAM: SPLITYARD CREEK EVENT: DAM SAFETY RISK - PIPING STATUS: EMERGENCY CONDITION STOOD DOWN ACTION: NONE

2. Police 3. LDMG

Phone & Email

Piping 5 Describe current situation with Dam: What is the event (Dam safety risk - piping). What is the status (Emergency condition stood down) Advise risk assessment has determined that piping risk has reduced and EAP has been deactivated.



Table 6: Piping: Embankment, foundation or abutments –DSTDM emergency action


Activation trigger • Increasing leakage through dam embankment, foundations, abutments, v-notches and/or any new area






Action • Arrange an inspection of the dam and assess its condition as soon as possible, when safe to do so. • Determine if piping condition has

been established • Liaise with DDO and IC • Monitor situation and assess risks

• As per previous activation level, plus: • Advise IC on potential machinery

and materials that may be required to affect repairs

• As per previous activation level, plus: • Assess risk and determine if failure

likely or in progress • Determine if risks can be reduced

by lowering storage and advise DDO • Determine if remedial repairs are

practical and advise DDO and IC • Supervise* remedial repairs (if

applicable) • Liaise with IC regarding road/bridge

closures

• As per previous activation level, plus: • Liaise with DDO and advise the IC

on need to recommend evacuations

• Forward information for EER to IC • Return to routine activities


• DDO • IC

• As per previous activation level • As per previous activation level, plus: • CSE/CleanCo Crisis Management

Team

• As per previous activation level, plus: • As required


• Nil • Dam Safety Regulator • As per previous activation level • As per previous activation level • As required


* Supervise means provide technical oversight to the work. It does not necessarily mean onsite supervision.

rd Creek Dam - 2019/20 - i12


6. Dam hazard – Earthquake

6.1 Overview The emergency action described in this section relates to a potential dam failure hazard due to an earthquake causing damage to the main embankment dam, foundations or abutments. Damage could take the form of cracking or slumping of the embankment, deformation or landslip or increased seepage.

If damage does occur then a dam failure may result. If damage is detected early, remedial repairs may be possible depending on the nature of the damage.


• If dam failure does not occur then there will not be any area affected • If dam failure does occur then the maximum area affected area is the level shown by the SDF line on the

maps in Appendix B.



rd Creek Dam - 2019/20 - i12


Figure 4: Dam hazard - Earthquake flowchart



Table 7: Earthquake – DDO emergency action


Activation trigger

• Earthquake reported or felt in the area • Intensity less than 5 MM (using

Modified Mercalli Scale)

• Earthquake reported or felt in the area • Intensity greater than or equal to 5 MM,

or • Intensity less than 5 MM and change


• Earthquake reported or felt in the area, and • A possible failure path has been

identified

• Failure in progress or likely due to earthquake, and • Sufficient water in storage to create a

dam failure hazard

• No change detected or no damage found during the inspections, or • Risk assessment has determined that

failure risk has reduced to an acceptable level • Repairs completed as necessary

Actions • Inspect the Dam wall, spillway structure, and abutments in daylight hours (if safe to do so) • Check for leaks, deformation,

erosion, and concrete damage • Liaise with the DSTDM following the

inspection • Maintain photographic record and

send to DSTDM following the inspection • Notify SO • Log Book entry

• As per previous activation level, plus • Immediately inspect the Dam wall,

spillway structure, and abutments using torches if required (if safe to do so) • Repeat the inspection as directed • Complete and send the Inspection Sheet

to DSTDM following each inspection

• As per previous activation level, plus • Support/supervise remedial works as

required, if safe to do so • Instruct others to lower the storage if

directed or considered necessary • Consider closing any affected roads, if

not already closed by others

• As per previous activation level, plus • Vacate the immediate vicinity of the

earthquake condition • Instruct others to lower the storage, if

not already instructed • Liaise with IC and DSTDM re potential

for evacuations

• Forward information for EER to IC • Log Book is to be updated • Return to routine activities





• Nil • Nil • Nil • Nil • Nil




Table 8: Earthquake – IC emergency action


Activation trigger


Modified Mercalli Scale




• Earthquake reported or felt in the area, and • A possible failure path has been

identified

• Failure in progress or likely due to earthquake, and • Sufficient water in storage to create


• No change detected or no damage found during the inspections, or • Risk assessment has determined

that failure risk has reduced to an acceptable level • Repairs completed as necessary

Actions • Liaise with DDO and DSTDM re situation

• As per pervious activation level, plus: • Activate EAP • Liaise with Police and LDMG re

situation • Investigate availability of machinery and

materials (if insufficient stockpiles available) • Place machinery operators on standby

if directed by DSTDM • Complete Situation Report, unless

otherwise directed • Complete Incident and Near Miss Alert

• As per pervious activation level, plus: • Mobilise resources to undertake

remedial works, if directed by DSTDM • Liaise with Police and LDMG

regarding potential road / bridge closures, if directed by DSTDM • Send D/S Residents landline voice


Form and send to SDCC Watch Desk • Follow up with phone call to SDCC

to ask that Splityard Creek Dam Emergency Polygon is activated

• As per pervious activation level, plus: • Liaise with DDO, DSTDM, Police

and LDMG re potential for evacuations

• Deactivate EAP • Compile EER and organise delivery

to the Regulator within 30 days of the completion of the event • Complete Situation Report (final) • Return to routine activities


• DDO • DSTDM

• As per previous activation level, plus • Incident and Near Miss Alert • CleanCo Communications Team



• Nil • Police • LDMG

• As per previous activation level, plus • D/S Residents • SDCC Watch Desk






Activation level Trigger for communications Group to contact Method Message

code Message text

Alert • Earthquake reported or felt in the area • Intensity less than 5 MM

Internal communications only

Lean Forward




1. Police 2. LDMG

Phone & Email

Quake 1 Describe current situation with Dam: What is the event (Dam safety risk – earthquake) What is the status (Under investigation) Advise EAP has been activated Advise current storage level LDMG and Police to stand by for further information

Incident and Near Miss Alert SAP System Splityard Creek Dam – Earthquake reported in the area

Stand Up 1

• Earthquake reported or felt in the area, and

• A possible failure path has been identified


Quake 2 CLEANCO EMERGENCY NOTIFICATION DAM: SPLITYARD CREEK EVENT: DAM SAFETY RISK – EARTHQUAKE STATUS: CONFIRMED EARTHQUAKE DAMAGE ACTION: POSSIBLE ISSUE AT DAM, LISTEN FOR FURTHER ADVICE

2. Police 3. LDMG

Phone & Email

Quake 2 Describe current situation with Dam: What is the event (Dam safety risk – earthquake felt or reported in area) What is the status (Possible earthquake damage to dam) Advise current storage level and discuss any necessary road/bridge closures LDMG and Police to prepare for possible evacuations


Quake 2 Complete Emergency Alert Request Form and send to SDCC Watch Desk Follow up with phone call to ask that Splityard Creek Dam Emergency Polygon is activated Message as shown above for D/S Residents

Incident and Near Miss Alert SAP System Splityard Creek Dam – Failure possible but not in progress





code Message text

Stand Up 2

• Failure likely due to earthquake, and • Sufficient water in storage to create a

dam failure hazard


Quake 3 CLEANCO EMERGENCY NOTIFICATION – URGENT DAM: SPLITYARD CREEK EVENT: DAM SAFETY RISK – EARTHQUAKE STATUS: DAM FAILURE LIKELY ACTION: POSSIBLE EVACUATION, FOLLOW INSTRUCTIONS OF EMERGENCY SERVICES

2. Police 3. LDMG

Phone Quake 3 Describe current situation with Dam: What is the event (Dam safety risk – earthquake) What is the status (Dam failure likely) Advise current storage level and discuss any road/bridge closures LDMG and Police to prepare coordinated evacuation



Incident and Near Miss Alert Splityard Creek Dam – Earthquake failure likely

• Dam failure in progress, and • Sufficient water in storage to create a

dam failure hazard


Quake 4 CLEANCO EMERGENCY NOTIFICATION – URGENT DAM: SPLITYARD CREEK EVENT: DAM SAFETY RISK – EARTHQUAKE STATUS: DAM FAILURE IN PROGRESS ACTION: MOVE TO HIGHER GROUND

2. Police 3. LDMG

Phone Quake 4 Describe current situation with Dam: What is the event (Dam safety risk – earthquake) What is the status (Dam failure in progress) Advise current storage level LDMG and Police to coordinate evacuation of Downstream Residents



Incident and Near Miss Alert Splityard Creek Dam – Earthquake failure in progress





code Message text

Stand Down

• No change detected or no damage found during the inspections, or

• Risk assessment has determined that failure risk has reduced to an acceptable level

• Repairs completed as necessary

1. D/S Residents (if from Stand Up)

Landline Voice Message & SMS

Quake 5 CLEANCO EMERGENCY NOTIFICATION DAM: SPLITYARD CREEK EVENT: DAM SAFETY RISK - EARTHQUAKE STATUS: EMERGENCY CONDITION STOOD DOWN ACTION: NONE

2. Police 3. LDMG

Phone & Email

Quake 5 Describe current situation with Dam: What is the event (Dam safety risk – earthquake) What is the status (Emergency condition stood down) Advise risk assessment has been determined that failure risk has reduced and that EAP has been deactivated



Table 10: Earthquake –DSTDM emergency action


Activation trigger


Modified Mercalli Scale




• Earthquake reported or felt in the area, and • A possible failure path has been identified

• Failure in progress or likely due to earthquake, and • Sufficient water in storage to

create a dam failure hazard

• No change detected or no damage found during the inspections, or • Risk assessment has determined

that failure risk has reduced to an acceptable level • Repairs completed as necessary

Action • Monitor situation and assess risks • Liaise with DDO and IC • Record all communications NOTE: An earthquake is ‘reported’ when an alert is received from Geoscience Australia or other source.

• As per pervious activation level, plus: • Review DDO surveillance inspection of

the dam and assess its condition as soon as possible • Determine if there are possible failure

paths from reported damage • Advise DDO on frequency of future

inspections • Advise IC on potential machinery and

materials that may be required to affect repairs

• As per pervious activation level, plus: • Arrange an inspection of the dam and

assess its condition as soon as possible, if safe to do so • Assess risk and determine if failure likely

or in progress • Determine if remedial repairs are

practical and advise DDO and IC • Determine if risks can be reduced by

lowering storage • Supervise* remedial repairs (if applicable) • Liaise with IC regarding road/bridge

closures

• As per pervious activation level, plus: • Liaise with DDO and advise the IC


• Forwaed information for EEC to IC • Return to routine activities


• DDO • IC

• As per previous activation level • As per previous activation level, plus • Crisis Management Team

• As per previous activation level • As required




* Supervision means provide technical oversight to the work. It does not necessarily mean onsite supervision

rd Creek Dam - 2019/20 - i12


7. Dam hazard – Terrorist threat/activity or high energy impact

7.1 Overview The emergency action described in this section relates to a potential dam failure hazard due to a terrorist threat or activity or a high energy impact on the dam such as a plane crash or meteor. Advice from authorities of a specific risk to water infrastructure is a circumstance that could indicate increased likelihood a terrorist threat. If this were specific enough to name a dam, this circumstance would trigger Stand Up—1 activation level.

However, the vulnerability of Splityard Creek Dam to a terrorist attack is low.


• if dam failure does not occur then there will not be any area affected • if dam failure does occur then the maximum area affected is the level shown by the SDF line on the maps in

Appendix B.



rd Creek Dam - 2019/20 - i12


Figure 5: Terrorist threat/activity or high energy impact



Table 11: Terrorist threat/activity or high energy impact – DDO emergency action

Activation level Alert Lean Forward Stand Up 1 Stand Up 2 Stand Up 3 Stand Down

Activation trigger


THREAT • Possible terrorist activity or suspicious

behaviour noticed at the dam • Threat received relevant to dam safety • EAP activated

EVENT IN PROGRESS • Large explosion heard/observed at the dam

(e.g. bomb explosion, aircraft hit) • Damage observed on the dam

RESPONSE • Failure in progress or likely due to

impact or explosion, and • Sufficient water in storage to create a

dam failure hazard

• No damage found during the inspections, or • Risk assessment has determined

that failure risk has reduced • Repairs completed as necessary

Actions • Continue routine activities and inspections at the Dam, but with a heightened awareness to look for any unusual activity at the Dam • Liaise with the DSTDM and IC

and respond as directed

• Notify Police on 000 • Inspect dam (if safe) and ensure all

security measures in place (locked gates etc) • Liaise with the DSTDM following the

inspection • Maintain photographic record and send

to DSTDM following the inspection • Complete and send the Inspection

Sheet to DSTDM following each inspection • Notify SO • Log Book entry • If Police appoint incident manager,

support and follow instructions

• As per previous activation level, plus: • Carry out inspections as directed by DSTDM • Support/supervise remedial works as

required, if safe to do so • Instruct others to lower the storage, if

directed or considered necessary • Consider closing any affected roads, if not

already closed by others

• As per previous activation level, plus: • Vacate the immediate vicinity of the

affected area • Instruct others to lower the storage, if

not already instructed • Liaise with IC and DSTDM re potential

evacuations

• Forward information for EER to IC • Log book is to be updated • Return to routine activities


• DSTDM • IC


• As per previous activation level • As per previous activation level • As required


• Nil • Police (000) • Nil • Nil • Nil




Table 12: Terrorist threat/activity or high energy impact – IC emergency action


Activation trigger



behaviour noticed at the dam • Threat received relevant to dam

safety • EAP activated

EVENT IN PROGRESS • Large explosion heard/observed at

the dam (e.g. bomb explosion, aircraft hit) • Damage observed on the dam


impact or explosion, and • Sufficient water in storage to create a

dam failure hazard



Actions • Liaise with DDO and DSTDM re situation • Assess appropriate response with

CSE/CleanCo’s Crisis Management Team

• Notify Police on 000 (if not completed by DDO) • Activate EAP • Liaise with Police and LDMG re

situation • Complete Situation Report, unless

otherwise directed • If Police appoint incident manager,

support and follow instructions • Monitor situation and assess risks • Complete Incident and Near Miss

Alert

• As per previous activation level, plus: • Mobilise resources to undertake

remedial works if directed by DSTDM • Liaise with Police and LDMG

regarding potential road/bridge closures, if directed by DSTDM • Send D/S Residents landline voice


Form and send to SDCC Watch Desk • Follow up with phone call to SDCC to

ask that Splityard Creek Dam Emergency Polygon is activated

• As per previous activation level, plus: • Liaise with DDO, DSTDM, Police and

LDMG re potential for evacuations

• Deactivate EAP • Compile EER and organise delivery to

the Regulator within 30 days of the completion of the event • Complete Situation Report (final) • •Return to routine activities


• DDO • DSTDM • CSE/CleanCo Crisis Management Team

• As per previous activation level, plus: • Incident and Near Miss Alert • CleanCo Communications Team



• Nil • Police, if not completed by DDO • LDMG

• As per previous activation level, plus: • D/S Residents • SDCC Watch Desk







code Message text

Alert • Alert/brief received from QPS Security and Counter-Terrorism Command relevant to dam safety

Internal communications only Lean Forward

Stand Up 1


behaviour noticed at the dam • Threat received relevant to dam safety • EAP activated

1. Police on 000, if not completed by DDO

2. LDMG

1. Phone 2. Phone & email

Emergency 1 Describe current situation with Dam: What is the event (Dam safety risk – suspicious behaviour /security threat, etc) What is the status (Noticed suspicious behaviour at the dam /received terrorist threat) Police to activate emergency response

Incident & Near Miss Alert SAP System Splityard Creek Dam – Possible terrorist activity / security threat

Stand Up 2

EVENT IN PROGRESS • Large explosion heard/observed at the

dam (e.g. bomb explosion, aircraft hit) • Damage observed on the dam


Emergency 2 CLEANCO EMERGENCY NOTIFICATION – URGENT DAM: SPLITYARD CREEK EVENT: DAM SAFETY RISK - SECURITY THREAT STATUS: UNDER INVESTIGATION ACTION: POSSIBLE EVACUATION, FOLLOW INSTRUCTIONS OF EMERGENCY SERVICES

2. Police on 000 (if event commenced at Stand Up 2)

3. LDMG


Emergency 2 Describe current situation with Dam: What is the event (Dam safety risk – security threat /impact /explosion etc) What is the status (Under Investigation) LDMG and Police to prepare coordinated evacuation


Emergency 2 Complete Emergency Alert Request Form and send to SDCC Watch Desk Follow up with phone call to ask that Splityard Creek Emergency Polygon is activated Message as shown above for D/S Residents

Incident and Near Miss Alert SAP System Splityard Creek Dam – Security event in progress





code Message text

Stand Up 3


impact or explosion; and • Sufficient water in storage to create a

dam failure hazard


Emergency 3 CLEANCO EMERGENCY NOTIFICATION – URGENT DAM: SPLITYARD CREEK EVENT: DAM SAFETY RISK - SECURITY THREAT STATUS: DAM FAILURE LIKELY / IN PROGRESS ACTION: MOVE TO HIGHER GROUND

2. Police 3. LDMG


Emergency 3 Describe current situation with Dam: What is the event (Dam safety risk – Security threat/ impact/ explosion etc.). What is the status (Dam failure likely/ in progress) LDMG and Police to initiate evacuations


Emergency 3 Complete Emergency Alert Request Form and send to SDCC Watch Desk Follow up with phone call to ask that Splityard Creek Emergency Polygon is activated Message as shown above for D/S Residents

Incident and Near Miss Alert SAP System Splityard Creek Dam – Security event in progress

Stand Down




Emergency 3 CLEANCO EMERGENCY NOTIFICATION DAM: SPLITYARD CREEK EVENT: DAM SAFETY RISK - SECURITY THREAT STATUS: EMERGENCY CONDITION STOOD DOWN ACTION: NONE

2. Police 3. LDMG

Phone & Email

Describe current situation with Dam: What is the event (Dam safety risk – Security threat/ impact/ explosion etc) What is the status (Emergency condition stood down) Advise that failure risk has been reduced and EAP has been deactivated



Table 14: Terrorist threat/activity or high energy impact –DSTDM emergency action


Activation trigger • Alert/brief received from QPS Security and Counter-Terrorism Command relevant to dam safety

THREAT • Possible terrorist activity or

suspicious behaviour noticed at the dam • Threat received relevant to dam

safety • EAP activated

EVENT IN PROGRESS • Large explosion heard/observed at the

dam (e.g. bomb explosion, aircraft hit) • Damage observed on the dam


impact or explosion, and • Sufficient water in storage to

create a dam failure hazard

• No damage found during the inspections, or • Risk assessment has

determined that failure risk has reduced • Repairs completed as necessary

Action • Liaise with DDO and IC re situation • Assess appropriate response with

CSE/CleanCo’s Crisis Management Team

• As per previous activation level, plus: • Liaise with the Dam Safety

Regulator

• As per previous activation level, plus: • Arrange an inspection of the dam and

assess its condition as soon as possible, if safe to do so • Assess risk and determine if failure likely

or in progress • Determine if risks can be reduced by

lowering storage and advise DDO • Determine if remedial repairs are

practical and advise DDO and IC • Supervise* remedial repairs (if applicable) • Liaise with IC regarding road/bridge

closures • Consider increasing the frequency of

surveillance inspections and advise DDO

• As per previous activation level, plus: • Liaise with DDO and advise the IC


• Forward information for EER to IC • Return to routine activities


• DDO • IC • CSE/CleanCo Crisis Management Team





* Supervision means provide technical oversight to the work. It does not necessarily mean onsite supervision

rd Creek Dam - 2019/20 - i12


Notifications and communication lists

Appendix A1: Wivenhoe Power Station notifications list

Appendix A2: Brisbane notifications list

Appendix A3: External notifications list

Appendix A4: D/S residents notifications list

Appendix A5: Other D/S residents notifications list

Appendix A6: Emergency alert polygon

Appendix A7: Sunny Day Failure (SDF) flood extent and PAR property locations

Appendix A8: Dam failure emergency alert request

Appendix A1 to A5 have been redacted

d Creek Dam - 2019/20 - i12


: Emergency alert polygon Figure 6: Emergency alert polygon

d Creek Dam - 2019/20 - i12


: Sunny Day Failure (SDF) flood extent and PAR property locations Figure 7: Sunny Day Failure (SDF) flood extent and PAR property locations

Dependent upon the progression of the failure mode and activation level, due to the close proximity of the PAR to Splityard Creek Dam and the short ‘travel times’ of a dam breach flood, notifications may be undertaken directly by Wivenhoe Power Station staff. Where there is time, CleanCo will arrange for notifications to be delivered through the SDCC.

20

19 18

17



: Dam failure emergency alert request

Queensland emergency alert request guidelines

An Emergency Alert Request form should be completed, if required (see Sections 5, 6 and 7 for actions), and sent to the SDCC Watch Desk in order to activate the Splityard Creek Dam Emergency Alert Polygon.

Instructions

• This form is not to be used for Flood UNLESS a flood has triggered a dam hazard. • Print off the following QFES Emergency Alert Request form. • Telephone the SDCC Watch Desk on 07 3635 2387 or 0408 190 872 and tell them your intention to use the

Emergency Alert for a dam hazard for Splityard Creek Dam. • A KML Polygon for this dam is stored in the “Splityard Creek Dam” area of the “Referable Dams” Folder. Ask

the SDCC operative to locate the polygon. It is a KML file called “SplityardCkDam_Downstream.kml” Emergency Polygon.

• Give them your phone number, confirm their name, and end the call after advising the form will be sent shortly.

• IC and DSTDM will work together to craft a message relevant to the hazard and discuss with the LDMG (Council), if there is time.

• Fill in the form and send to SDCC watch desk email: [email protected]. This form must come from the IC, DSTDM, or member of the Executive.

• Phone back to check the message has been sent and ask for an email to confirm. • Send an internal Incident Alert to advise of completion. • This form MUST be sent from a CS Energy email address. If CS Energy email is not functional, they can

confirm identification through the Regulator, if required. • Where relevant, use the text in the IC Communication Plans in the relevant dam hazard tables in Sections 5, 6

and 7 to complete the emergency alert request.



Sample only, create a new file using template W/D/20/54

Figure 8 Emergency Alert Request form

EMERGENCY ALERT REQUEST Location: Ipswich & Somerset LGAs Date: xx / xx / xx20

Time: xxxx hrs

Requesting Officer: Name Telephone: 24/7 available mobile no.

Agency/Position: CS Energy on behalf of CleanCo Email: email address

Event

Type

Cyclone Storm Surge Flash Flood Flood

Bushfire Fire Incident Smoke or Toxic Plume Chemical Spill

Tsunami (NOTE Tsunami EA campaigns will be sent as Location Based Text Message ONLY) Other (please specify): Dam Emergency

Message Severity Emergency Warning (NOTE activates the SEWS) Watch & Act Advice

Campaign Mode Voice SMS – Location Based SMS – Service Address Based

LDMG Advised YES NO DDMG Advised YES NO

Threat Direction Required? YES NO Note: Can only be used for Emergency Warnings. Indicate direction on map

STEP 1. EA Polygon Area: Use North Burnett LGA Boundary STEP 2. Filename: Use North Burnett LGA Boundary for EA Campaign

STEP 3. Spatial format: (Indicate the format used) KML *.kml (preferred format as per Spatial guidelines) ESRI *.dbf, *.prj, *.shp, *.shx GML *.gml, *.xsd MapInfo TAB *.dat, *.id, *.map, *.tab MapInfo Mid/Mif *. MIDI Sequence, *.mif OTHER

STEP 4. Messaging/spatial data, is it supplied via DMportal - specify filenames below FTP - specify filenames below Email Other (please specify)

Filename: SplityardCkDam_Downstream.kml (saved in the “Referable Dams” > ”Splityard Creek Dam” folder on the EA Portal

Type (please use capitals for clarity) or handwrite Voice message (Ideally message should be less than 450 characters). This is a Dam Emergency message from Ipswich and Somerset Councils. There is a dam emergency occurring at the split yard creek dam. [more detailed warning information as required]. Residents downstream of the split yard creek dam should [action to take]. For more information, listen to local radio, or visit [website], or call [hotline]. In the case of a life threatening emergency, please dial triple zero immediately.

Type or handwrite SMS below (maximum of 160 characters including spaces) Ipswich / Somerset Councils advise: Dam Emergency at the Splityard Creek Dam. [Action to take]. [Website / Hotline / Radio for more information] SEND TO [email protected] and call 07 36352387 TO CONFIRM

FOR USE BY SDCC

Requesting Officer: Signature / /20 Manual Transmission EMS Transmission

EA Campaign No. ___________ EMS Report ID: _____________

EA User Name: Signature / /20

Authorising Officer Name: Signature / /20

EA Manual and the Emergency Alert Request Form Template are available at: www.disaster.qld.gov.au

mailto:[email protected]

DO NOT SEND THIS PAGE GUIDE TO COMPLETE STEPS 1 – 4

STEP 1.

EA Polygon Area (e.g. detailed description and location reference to allow positive identification of message area, including street names with cross street, areas of interest such as parks, rivers, dams, coastal areas) it is preferable to attach a map identifying the message area. If a Threat Direction has been requested, please clearly indicate it on the map.

STEP 2. Tick applicable box and note the file name.

STEP 3.

Voice Message: type or handwritten the required message. As the message will be translated by a text-to-speech process it is important that words are not unintelligible when translated e.g. “qld” used in a web site address must be entered as “q l d”, similarly the word “dot” must be entered into a web address instead of a full stop.

Voice Message ideally should have no more than 450 characters including spaces. Do not use special characters – refer to EA Manual for details. Warning message must start with “Emergency Emergency”

STEP 4. SMS Is restricted to a maximum of 160 characters including spaces and punctuation. Either type the message or handwrite the characters into the boxes.

Example: SMS Flash Flood Warning from SES for Opal Valley-immediate threat to life/property-Warn others-Leave area/prepare NOW or seek higher ground-Listen to local radio

If using template EA messages, please provide the appropriate variables that are in the template message guides. Refer to the Queensland Emergency Alert Manual for copies of the template message guides.

//RELEVANTAUTHORITY//

//DIRECTIONANDAREA//

//NAME//

//NUMBER//

//TIME//

//TIMEandDAY//

//DIRECTIONandPLACE//

//HOURSMINUTES//

//PLACE//

//PLACEPLACE//

//EXTERNAL/INTERNAL//

//SUBURBS//

//FireIncident//



Flood impact downstream and inundation maps

Appendix B1: Modelled peak flood velocities

Appendix B2: Modelled peak flood depths



: Modelled peak flood velocities

Peak flood velocities are predicted to occur along the length of Pryde Creek with maximum values exceeding 7m/s as shown in Figure 9. Velocities in this order are considered ‘extreme’ and any buildings experiencing velocities in this order are expected to be severely damaged or destroyed.

Figure 9: Modelled peak flood velocities



: Modelled peak flood depths

Peak flood depths are predicted to exceed 4.5 m through much of Pryde Creek as shown in Figure 10. This is due to the ‘incised’ nature of the channel.

Figure 10: Modelled peak flood depths

Note: Actual levels may differ from those shown in flood inundation maps due to variations in assumptions made in the models to actual flood events.



Routine and emergency access routes

Normal access routes

The dam and surrounds are accessed by way of the perimeter gates and the access tracks within the boundary fences. Keys to the gates are held in the key cabinet in the station office. The Wivenhoe 4-wheel drive vehicles are to be used for access to the Splityard Creek Dam tracks for inspections and observations.

The normal access to Wivenhoe Power Station and Splityard Creek Dam is via the Brisbane Valley Highway, then Wivenhoe Somerset Road. Wivenhoe Somerset Road will become hazardous in the event of a catastrophic failure of Splityard Creek Dam.

For levels of severity Stand Up–1 and Stand Up-2, Wivenhoe Somerset Road should only be used on the advice of personnel physically inspecting the condition of the dam for evaluating “possibility of failure” status.

Emergency access routes

In the event of Wivenhoe Somerset Road not being accessible from the Brisbane Valley Highway, other methods of access to Splityard Creek Dam are (not in priority order):

Refer to Figure 11 for a map of the routes with indicative travel times.

Options Alternative Route

1 Boat access from Seqwater information centre at Wivenhoe Dam across the lake to Wivenhoe Power Station, with cooperation from Seqwater personnel. Access from Wivenhoe Power Station to Splityard Creek Dam is unlikely to be restricted.

2 Vehicle access north via Brisbane Valley Highway through Esk, then east via Esk Kilcoy Road to Somerset, then south via Wivenhoe Somerset Road to Splityard Creek Dam.

3 Vehicle access north-west via Samford Road to Samford, then west via Mt Glorious Road to Mt Glorious, then west via Mount Glorious Road continuing onto Northbrook Parkway to a tee intersection with Wivenhoe Somerset Road, then south via Wivenhoe Somerset Road to Splityard Creek Dam.

4 North from Brisbane via Bruce Highway to Caboolture, then west via D’Aguilar Highway to Kilcoy, then south via Esk Kilcoy Road to Somerset, then south via Wivenhoe Somerset Road to Splityard Creek Dam.



Figure 11 Map of emergency access routes



Machinery and equipment

Equipment required for undertaking inspections include:

• Keys for access gates. Keys to the gates are held in the key cabinet in the Wivenhoe Power Station office.

• Measuring tapes for V-notch leakage weirs – carried in the 4-wheel drive vehicles.

• Dam inspection sheet and clipboard

• V-notch spreadsheet located electronically in CS Energy’s record management system

• Torches, if inspections are carried out at night, held in the Wivenhoe Power Station tool store.

• 2-way radios for communications – carried by each individual Wivenhoe Power Station staff member.

• Cameras for images of V-notch weir water colour, and any observed defects at the outlet works, the embankment, the abutments, or any other location – held in Wivenhoe Power Station office.

Table 15: List of machinery and equipment available during an emergency

Name of equipment No Owner Contact number Location

Satellite phone 1 CS Energy 5427 1100 Wivenhoe Power Station

Small front-end loader 1 CS Energy 5427 1100 Wivenhoe Power Station

4-wheel drive vehicles 3 CS Energy 5427 1100 Wivenhoe Power Station

First aid & rope rescue access equipment CS Energy 5427 1100 Wivenhoe Power Station

Office space for coordination of emergency 2 CS Energy 5427 1100 Wivenhoe Power Station



Technical information

Appendix E1: DRAWING A3-73669 – SPLITYARD CREEK DAM – OPERATIONAL CURVES FOR MAXIMUM DRAWDOWN RATES

Appendix E2: DRAWING A4-83876 – SPLITYARD CREEK DAM – SPILLWAY DISCHARGE CURVE

Appendix E3: DRAWING S 46966 – SPLITYARD CREEK DAM – RESERVOIR STORAGE CURVES

Appendix E4: MAP – SPILTYARD CREEK DAM – CATCHMENT AREA

Appendix E5: DRAWING A1-48283E – SHEET 1 OF 2 – SPLITYARD CREEK DAM – EMBANKMENT, SECTION AND DETAILS

Appendix E6: DRAWING A1-48284C – SHEET 2 OF 2 – SPLITYARD CREEK DAM – EMBANKMENT, SECTION AND DETAILS

Appendix E7: DRAWING A3-243211B – SPLITYARD CREEK DAM – INSTRUMENTATION GROUNDWATER OBSERVATION HOLES AND MEASURING WEIRS



: DRAWING A3-73669 – SPLITYARD CREEK DAM – OPERATIONAL CURVES FOR MAXIMUM DRAWDOWN RATES



: DRAWING A4-83876 – SPLITYARD CREEK DAM – SPILLWAY DISCHARGE CURVE

NOTE: Spillway discharges flow north into Branch Creek and return to Wivenhoe Lake. Spillway discharges do not enter the original watercourse south into Pryde Creek



: DRAWING S 46966 – SPLITYARD CREEK DAM – RESERVOIR STORAGE CURVES



: MAP – SPILTYARD CREEK DAM – CATCHMENT AREA



: DRAWING A1-48283E – SHEET 1 OF 2 – SPLITYARD CREEK DAM – EMBANKMENT, SECTION AND DETAILS



: DRAWING A1-48284C – SHEET 2 OF 2 – SPLITYARD CREEK DAM – EMBANKMENT, SECTION AND DETAILS



: DRAWING A3-243211B – SPLITYARD CREEK DAM – INSTRUMENTATION GROUNDWATER OBSERVATION HOLES AND MEASURING WEIRS



Summary of legal requirements

SUMMARY OF LEGAL REQUIREMENTS – SECTION 352H

Section 352H(1) of the Act requires that the EAP must identify each dam hazard for the dam;

and for each of these dam hazard types (e.g., flood operations, or chemical spill/toxic conditions):

1. identify the area likely to be affected by a dam hazard event or emergency event arising from the dam hazard; and

2. identify each circumstance that indicates a material increase in the likelihood of the dam hazard event or emergency event happening; and

3. state when and how the owner of the dam plans to warn persons who may be harmed, or whose property may be harmed by an event caused by the dam hazard, if one happens, and/or there is a material increase in the likelihood of an occurrence, including the order of priority in which the persons or categories of persons are to be warned; and

4. state when and how the owner plans to notify the relevant entities for the dam, if a dam hazard event or emergency event happens or, there is a material increase in the likelihood of such an occurrence, including the order of priority in which the relevant entities are to be notified; and

5. state the actions the owner of the dam plans to take in response to a dam hazard event or emergency event.

In accordance with section 352H(2) of the Act, the EAP may provide for the dam owner to make arrangements with a relevant entity for warnings to be given by the relevant entity on behalf of the dam owner in appropriate circumstances.

Section 352HA of the Act states that before giving the chief executive an EAP, the owner of the dam must give a copy of the plan to each local government whose area may be affected by a dam hazard identified in the plan; and each district group for the plan.

Section 352HB of the Act states that the local government must assess the EAP for consistency with its disaster management plan. In its assessment, the local government must consult with the local district group for the plan.

Within 30 business days of receiving the EAP, the local government must give the owner of the dam a notice, which states whether it considers the plan is consistent with its disaster management plan; and if not, give reason why it considers the EAP is not consistent. The EAP must include any such notices, provided to the owner of the dam by a local government (or district group); and any responses which the owner gives to these notices. Section 352H(1) further stipulates that an EAP must include any other relevant matter prescribed by regulation.

The local government whose area may be affected by a dam hazard for Splityard Creek Dam has been assessed as Somerset Regional Council (SRC). CS Energy has provided the SRC with a copy of the draft EAP for assessment.

Section 352HC of the Act states that a district group may review the EAP for consistency with its disaster management plan. The district group for Splityard Creek Dam is Ipswich District Disaster Management Group (DDMG). CS Energy has provided the DDMG with a copy of the draft EAP for review.



Notices from local government and district groups including responses

Appendix G1: Local government consultation and interaction

Appendix G2: District groups consultation and interaction



: Local government consultation and interaction

Workshops

In preparation of this EAP version 9, workshops were undertaken as follows, with representatives from Local Government including the Local District Coordinator and the Disaster Management Officer from Somerset Regional Council.

1. Workshop to test the EAP version 8 on 21 May 2019. 2. Workshop to review a first draft of the EAP version 9 on 18 June 2019.

Notices

Figure 12: Local Government Notice

Responses

No response required – not applicable.



: District groups consultation and interaction

Workshops

In preparation of this EAP version 9, workshops were undertaken as follows, with representatives from the District Group including the DDMG, QPS (Ipswich District Police and Lowood Police Station), QFES and the Dam Safety Regulator.

1. Workshop to test the EAP version 8 on 21 May 2019. 2. Workshop to review a first draft of the EAP version 9 on 18 June 2019.

Notices

An email was received on Tuesday 16 July 2019, but no formal notice was provided.

Responses

No response required – not applicable.



Emergency action plan – Toolkit

Appendix H1: Dam hazard emergency event recording sheets

Appendix H2: Dam hazard specific forms



: Dam hazard emergency event recording sheets

Dam Hazard Emergency Event Recording Sheets

This sub-appendix includes the following recording sheets: • Dam Hazard Emergency Event Record sheet • Record of Communication and Log of Events / Actions sheet

** NOTE: These sheets must be completed for all Dam Hazard Emergency Event Scenarios, and included in the Emergency Event Report.

NOTE: The following sheets must be photocopied and completed during Dam Hazard Emergency Event

Scenarios and be included in the Emergency Event Report (EER). This Report is to be completed within 30

business days following an event as specified in Clauses 352T, 352U and 352V of the Water Supply (Safety

and Reliability) Act 2008.

1. Sheets filled in by hand are to be scanned and included in the final PDF copy of the completed Emergency Event Report.

2. Electronic data recording sheets may be compiled and used, and templates set up in relevant TRIM file location for EAP correspondence – TRIM folder F/14/1763

3. Once completed with data relating to the Emergency Event Report (EER) these sheets are to be saved in the above EAP correspondence location.



DAM HAZARD EMERGENCY EVENT RECORD

COMPLETE THIS COVER SHEET AND ATTACH RELEVANT RECORDING SHEETS

1. NATURE OF THE EVENT (circle the event)

Earthquake Piping Terrorist Activity/Hoax/Other Commencing: Time ___:___am/pm; Date ___/___/______ Finishing: Time ___:___am/pm; Date ___/___/______

2. DESCIPTION OF THE EVENT

Attach relevant sheets from Appendix D

3. NOTIFICATION & STATISTICS

External entities to be notified, as per the EAP:

Actual notification provided:

Local Disaster Coordinator – Somerset Council Phone Date:

District Disaster Coordinator – Ipswich Police Phone Date:

Queensland Fire and Emergency Service – SDDC Phone Date:

Queensland Police Service - Lowood Phone Date:

Dam Safety Regulator Phone Date:

4. EVENT PROGRESS

Attach copies of the Dam Water Level versus Time Graph, the Record of Communication, the Log of Events / Actions, and Rainfall during a Flood Event (Appendix D).

5. GENERAL COMMENTS Include in this section any observations or comments regarding the Event, such as equipment malfunctions, improved reporting, safety issues, or any suggestions which may improve monitoring of the Event.

6. DAMAGE REPORT Detail any damage to the Dam wall, Spillway, Abutments or Stream bank in the downstream area of the Dam. Attach photos.

Name: Signed: Designation: Date:



SPLITYARD CREEK DAM – EMERGENCY ACTION PLAN

RECORD OF COMMUNICATION AND LOG OF EVENTS / ACTIONS Date Time Contact Person Phone No. Action Taken / Event Recorded / Message Sent or Received Call Sent By / Received By

Splityard Creek Dam - 2019/20 – i12


: Dam hazard specific forms

This sub-appendix includes the following forms:

• Piping Inspection Sheet

• Earthquake Inspection sheet

• Terrorist Activity/ Threat/ Other Inspection Sheet

For condition specific forms shown in bold above, Show results of inspections as follows:-

• New NEW

• Significant increase (> 30%) or change in condition SG-INC

• Slight increase (> 10%) or change in condition INC

• NIL change of condition NIL

• Slight decrease (< 10%) or change in condition DEC

Significant Changes:

Any changes which, in the opinion of the inspecting officer, are more than just slight changes must be advised to the DSTDM. The degree of urgency of this advice varies with the nature of the issue. Mark changes on a plan if appropriate.



SPLITYARD CREEK DAM EAP Piping Inspection Sheet Visual Inspection and Storage Report - REMEMBER: TAKE PHOTOS AND DATE STAMP THEM Date…………………..………..

Tick Day of the Week SUN MON TUE WED THU FRI SAT

VISUAL INSPECTION (Inspections should only be undertaken if / when it is safe to do so)

First Inspection

(As directed)

Second Inspection

(As directed)

Third Inspection

(As directed)

Fourth Inspection

(As directed)

(Walk or Drive at 10 km/hour. Write 'W' for walk and 'D' for Drive)

Time Water Level – Max OL 166.5 m AHD (Spillway Level) Rainfall (mm) Location of new seepage point Describe approximate location in words New seepage point Estimated flow L/s L/s L/s L/s

Clear or turbid (tick for clear)

Old seepage points Complete measuring weir sheet

Main Embankment

General condition/ Cracking

Upstream Face (Use binoculars) General condition

Displacement of riprap material

Subsidence/ Slides/ Erosion

Sign of seepage

Downstream Face General condition

Displacement of riprap material

Subsidence/ Slides/ Erosion

Sign of seepage

Saddle Dam

General condition

Subsidence/ Slides/ Scouring/ Signs of seepage Details of significant changes. New occurrences and issues warranting further attention, Source of seepage (if known) Sketch, locate, measure and photograph if possible. (sketch the problem area on the General Arrangement Plan)

Inspecting Officer's initials

* Fax/Email to (tick if Faxed or Emailed)

See Part 2 for Fax Number

Dam Safety Technical Decision Maker Incident Coordinator

* Original to be retained on site or in Area Office if no facility to store documents on site



SPLITYARD CREEK DAM EAP Piping

** INSTRUCTIONS FOR COMPLETING SHEET - Piping

VISUAL INSPECTION (To be carried out when/if safe to do so)

Frequency of visual inspection required is indicated by STAGE 1

As directed

STAGE 2 As directed

STAGE 3

As directed

Additional Inspections should be made when:

• New seepage which requires further action

• When specifically requested

Show results of inspections as follows:-

• New seepage appeared NEW





Significant Changes




SPLITYARD CREEK DAM EAP Earthquake Inspection Sheet Visual Inspection and Storage Report - REMEMBER: TAKE PHOTOS AND THE DATE STAMP THEM Date…………………..………..

Tick Day of the Week SUN MON TUE WED THU FRI SAT Earthquake Intensity felt: ………………….MM

VISUAL INSPECTION (Inspection to be undertaken only when safe to do so)

First Inspection

(As directed)

Second Inspection

(As directed)

Third Inspection

(As directed)

Fourth Inspection

(As directed)

(Walk OR Drive at 10 km/hour. Write 'W' for walk and 'D' for Drive)

Time Water Level – Max OL 166.5 m AHD (Spillway Level) Rainfall (mm) Main Embankment Upstream Face (Use binoculars) General condition

Displacement of riprap material Subsidence/ Slides/ Erosion

Sign of seepage Downstream Face General condition


Sign of seepage Spillway General condition Damage to concrete/ Movement/ Cracks Saddle Dam Upstream Face (Use binoculars) General condition


Sign of seepage Downstream Face General condition


Sign of seepage Spillway Channel General condition

Scouring/ Damage to concrete structure Inlet Structure/ Outlet Works General condition

Cracks/ Concrete deterioration Area Downstream of Dam General condition New seepage point Estimated flow L/s L/s L/s L/s

Clear or turbid (tick for clear) Old seepage points Complete measuring weir sheet Details of significant changes. New occurrences and issues warranting further attention, additional records/inspections New Cracks or Movements: Sketch, measure, photograph, and locate if possible. Sketch on the Plan (see over)

Inspecting Officer's initials Fax/Email to

(tick if Faxed or Emailed) See Part 2 for Fax Number


* Original to be retained on site or in Area Office if no facility to store



SPLITYARD CREEK DAM EAP Earthquake

** INSTRUCTIONS FOR COMPLETING SHEET - Earthquake

VISUAL INSPECTION (To be carried out when/if safe to do so)

Frequency of visual inspection required is indicated by:

Earthquake less than Alert Criteria, but felt at the dam or in the vicinity of the dam:

COMPLETE FIRST VISUAL INSPECTION

ONLY

Earthquake greater than Alert Criteria:

COMPLETE ALL VISUAL INSPECTIONS (AND

INSTRUMENTATION/ SURVEY DATA IF

APPLICABLE AS WELL)

Additional Inspections should be made when:

• New cracks, settlements or sinkholes which requires further action



• New observation NEW





Significant Changes




SPLITYARD CREEK DAM EAP Reported Earthquake

EARTHQUAKE / TREMOR INSTRUCTIONS

The occurrence of a significant seismic event could endanger the integrity of the dam, and requires a specific emergency response. If an earthquake occurs which has a magnitude that meets or exceeds the alert criteria shown below, or has been reported to have occurred, then the Emergency Action Plans in Section 6 should be followed.

REPORTED ALERT CRITERIA - Magnitude (Richter Scale)

Magnitude >4.0 within 25 km radius of the dam





Detailed information on recent earthquakes in Australia and nearby regions is available at the Geoscience Australia website (Ref: http://www.ga.gov.au/earthquakes/). Reference should be made to the Geoscience Australia website to confirm magnitude and location of any earthquakes. The Modified Mercalli Scale is included at Figure 13 for understanding earthquake magnitude and contingency backup, if the Geoscience Australia website not accessible or not operating.



SPLITYARD CREEK DAM EAP Felt Earthquake If any earthquake is felt at the dam or in the vicinity of the dam, which does not exceed the above criteria, then a routine inspection should be carried out by operating staff, and if any damage is observed, then the Emergency Action Plans in Section 6 should be followed.

Figure 13 Modified Mercalli Scale for Felt earthquake magnitude assessment

EARTHQUAKE ASSESSMENT (MODIFIED MERCALLI SCALE) MM 1 Not felt by humans, except in especially favourable circumstances, but birds and animals may

be disturbed. Reported mainly from the upper floors of buildings more than 10 storeys high. Dizziness or nausea may be experienced. Branches of trees, chandeliers, doors and other suspended systems of long natural period may be seen to move slowly. Water in ponds, lakes reservoirs, etc. may be set into wave oscillation of short to long durations.

MM 2 Felt by a few persons at rest indoors, especially by those on upper floors or otherwise favourably placed. The long-period effects listed under MM 1 may be more noticeable.

MM 3 Felt indoors, but not identified as an earthquake by everyone. Vibration may be likened to passing of light traffic. It may be possible to estimate the duration, but not the direction. Hanging objects may swing slightly. Standing motorcars may rock slightly.

MM 4 Generally noticed indoors, but not outside. Very light sleepers may be wakened. Vibration may be likened to the passing of heavy traffic, or to the jolt of a heavy object falling or striking the building. Walls and frame of buildings are heard to creak. Doors and windows rattle. Glassware and crockery rattles. Liquids in open vessels may be slightly disturbed. Standing motorcars may rock, and the shock can be felt by their occupants.

MM 5 Generally felt outside, and by almost everyone indoors. Most sleepers awakened. A few people frightened. Direction of motion can be estimated. Small unstable objects are displaced or upset. Some glassware and crockery may be broken. Some windows cracked. A few earthenware toilet fixtures cracked. Hanging pictures move. Doors and shutters swing. Pendulum clocks stop, start, or change rate.

MM 6 Felt by all. People and animals alarmed. Many run outside. Difficulty experienced in walking steadily. Some plaster cracks or falls. Isolated cases of chimney damage.



EARTHQUAKE ASSESSMENT (MODIFIED MERCALLI SCALE) MM 7 General alarm.

Difficulty experienced in standing. Noticed by drivers of motorcars. Trees and bushes strongly shaken. Large bells ring. A few instances of damage to masonry. Loose brickwork and tiles dislodged. Un-braced parapets and architectural ornaments may fall. Stone walls cracked. Weak chimneys broken, usually at the roof-line. Domestic water tanks burst. Concrete irrigation ditches damaged. Waves seen on ponds and lakes. Water made turbid by stirred-up mud. Small slips and caving-in of sand and gravel banks.

MM 8 Alarm may approach panic. Steering of motorcars affected. Masonry damaged, with partial collapse. Chimneys, factory stacks, monuments, towers, and elevated tanks twisted or brought down. Panel walls thrown out of frame structures. Some brick veneers damaged. Decayed wooden piles broken. Frame houses not secured to the foundation may move. Cracks appear on steep slopes and in wet ground. Landslips in roadside cuttings and unsupported excavations. Some branches may be broken off. Changes in the flow or temperature of springs and wells may occur. Small earthquake fountains.

MM 9 General Panic. Masonry heavily damaged, sometimes collapsing completely. Frame structures racked and distorted. Damage to foundations general. Frame houses not secured to the foundations shifted off. Brick veneers fall and expose frames. Cracking of the ground conspicuous. Minor damage to paths and roadways. Sand and mud ejected in alleviated areas, with the formation of earthquake fountains and sand craters. Underground pipes broken. Serious damage to reservoirs.

MM 10

Most masonry structures destroyed, together with their foundations. Some well built wooden buildings and bridges seriously damaged. Dams, dykes and embankments seriously damaged. Railway lines slightly bent. Concrete and asphalt roads and pavements badly cracked or thrown into waves. Large landslides on river banks and steep coasts. Sand and mud on beaches and flat land moved horizontally. Large and spectacular sand and mud fountains. Water from rivers, lakes, and canals thrown up on the banks.



SPLITYARD CREEK DAM EAP Terrorist Activity/ Threat/ Other Inspection Sheet

Visual Inspection and Storage Report - REMEMBER: TAKE PHOTOS AND THE DATE STAMP THEM Date…………………..………..

Tick Day of the Week SUN MON TUE WED THU FRI SAT

VISUAL INSPECTION Inspections should only be undertaken if / when it is safe to do so.

First Inspection (As directed)

Interim Inspection (As directed)

Final Inspection

(As directed)

(Walk OR Drive at 10 km/hour. Write 'W' for walk and 'D' for Drive)

Time

Water Level – Max OL 166.5 m AHD

Rainfall (mm)

Main Embankment

General condition/ Damage

Upstream Face (use binoculars) Settlement

Displacement of riprap material or sink holes

Downstream Face Sloughing

Sign of seepage/ Subsidence/ Slides/ Erosion

Area Downstream of Dam

New seepage

Increase in seepage

Inlet Structure/ Outlet Works General condition

Damage/ Cracking/ Spalling/ Construction joints

Damage/ Deterioration of valves

Spillway

Channel scouring

Damage to concrete

Saddle Dam

General condition/ Erosion/ Damage

Seepage

New seepage point Estimated flow L/s L/s L/s

Clear or turbid (tick for clear)

Old seepage points Complete measuring weir sheet

Details of significant changes. New occurrences and issues warranting further attention New Cracks or Movements: Sketch, measure, photograph, and locate if possible. Sketch on the Plan (see over)

Inspecting Officer's initials

* Fax/Email to (tick if Faxed or Emailed)

See Part 2 for Fax Number


(Circle Activity)

* Original to be retained on site or in Area Office if no facility to store documents on site



SPLITYARD CREEK DAM EAP Terrorist Activity / Threat / Other

** INSTRUCTIONS FOR COMPLETING SHEET – Terrorist Activity / Threat / Other

VISUAL INSPECTION

Frequency of visual inspection required is determined by the extent of damage AS DIRECTED

Additional Inspections should be made when

• New cracks or breaching of dam is evident which require further action



• New observation NEW





Significant Changes




MEASURING WEIR SEEPAGE MEASUREMENT READINGS SHEET

Date

Time

Storage Level (m)

MW1 (mm) MW2 (mm) MW3 (mm) MW4 (mm) MW5 (mm) MW6 (mm) MW7 (mm) MW8 (mm) MW9 (mm) Clear /

Turbid 4 Clear /

Turbid 2 Clear /

Turbid 2 Clear /

Turbid 2 Clear /

Turbid 2 Clear /

Turbid 2 Clear /

Turbid 2 Clear /

Turbid 2 Clear /

Turbid 2 Clear /

Turbid 2

4 Seepage water – Clear or Turbid (tick for clear)



GROUND WATER BOREHOLE OBSERVATIONS SHEET

Date Observed ……………….. Res. Level at start ……………….. Time ………………..

Borehole No

PH52 ……………….. OH64 ……………….. PH51 ……………….. OH59 ……………….. PH27 ……………….. OH58 ……………….. PH28 ……………….. OH65 ……………….. PH24 ……………….. OH66 ……………….. PH25 ……………….. OH67 ……………….. PH56 ……………….. PH48

……………….. PH57 ……………….. PH31 ………………..

WH143 ……………….. PH49 ……………….. PH33 ……………….. PH50 ……………….. PH34 ……………….. OH70A ……………….. PH46 ……………….. OH71 ……………….. PH47 ……………….. OH78 ……………….. OH62 ……………….. OH79 ……………….. OH63 ……………….. OH83 ……………….. OH61 ……………….. OH84 ……………….. OH60 ……………….. OH85 ……………….. OH74 ……………….. OH86 ……………….. OH73 ……………….. PH87 ……………….. OH75 ……………….. PH89 ……………….. OH72 ……………….. PH90 ……………….. OH76 ……………….. PH91 ……………….. OH69 ……………….. PH92 ……………….. OH68 ………………..

Res. Level at End ……………….. Time ………………..



LOWER HUT PIEZOMETER READINGS SHEET



UPPER HUT PIEZOMETER READINGS SHEET



EXTENSOMETER READINGS SHEET