approved by the delegate of the chief executive

banksm

Stamp

WIDTJ

Text Box

Approved by the delegate of the Chief Executive, Department of Natural Resources, Mines and Energy until 1 September 2023.

Haven Property Dam Rev D - November 2020

Contents

Emergency Action Plan 1

PREPARATION AND AUTHORISATION 2

Introduction 4

Dam Information 4

Dam location 4

Distribution of emergency action plan 5

Notification listing 6

Downstream affected properties 8

Dam owner responsibilities 9

Emergency events 10

EAP activation 10

Emergency management 10

Event escalation tables 11

Plan for damage control 15

Personnel sources 15

Plant and equipment sources 15

Material sources 15

Location maps 17

Downstream Points of Interest 18


Introduction

Haven Property Dam 1007 is located on Range Creek upstream of the Timber Gully junction. It is for the purpose of livestock watering, Homestead lawns and gardens, irrigation and any other purposes as per the water allocation agreement. The dam has a homogeneous earth fill embankment with a spillway on the left abutment. An auxiliary spillway is located on the right abutment. The crest length of the dam is approximately 170 meters.

Dam Information

Dam name: Haven Property Dam

Dam ID: 1007

Owners name:

Owners phone no.:

Standby operator:

Standby operator phone no.:

Stream name: Range Creek

Reservoir name: N/A

Dam location

Latitude: 26042’46.75’’ SOUTH

Longitude: 149055’24.95’’ EAST

Physical address:

Lot and plan numbers: Lot 167 on Plan BWR476


Distribution of emergency action plan

Distributed to Name and postal address Distribution

copy no.

Dam owner

1

Standby Operator

2

Dam Safety Regulator, DNRME

Director, Dam Safety Department of Natural Resources, Mines and Energy (DNRME) 1 William Street, Brisbane

PO Box 15218, City East

Queensland 4002 Australia

3

Local Disaster Management Group

Executive Officer

Western Downs LDMG PO Box 551 Dalby Qld 4405

4

QPS Dalby DDMG Executive Officer

c/o Queensland Police Service PO Box 420 Dalby Qld 4450

E: [email protected]

5

Dam personnel n/a

Others n/a

mailto:[email protected]


Notification listing

Relevant agencies Priority order

Name Location Contact details Notification requirement Flood failure

Sunny day

failure

Emergency Services

Miles 000 • If a serious or life threating injury has occurred than Emergency Services (000) is the first point of call, otherwise continue down the list

1 1

Standby Operator

PO 33655 Leichhardt Highway Guluguba 4418

• Provide necessary information regarding the developing emergency condition at regular interval

• Immediately request to evacuate if the dam is likely to fail

2 2

Local Disaster Management Group

Western Downs LDMG LDMG Executive Officer

LDMG Coordinator

• Keep the LDMG informed as the emergency situation develops as stated in Table 1 and 2.

• Immediately notify of any incidents or failures

3 3

Dam Safety Regulator, DNRME

Brisbane 1300 596 709 • Keep the Dam Safety Regulator informed as the emergency situation develops as stated in Table 1 and 2.

• Immediately notify of any incidents or failures

4 4

Local Police Station

Miles Police Station 32 Constance Street Miles Qld 4415

Local number:

(07) 4622 9797

Sargent / Disaster

• The local police only needs to be contacted during an event where an evacuation is required


Relevant agencies Priority order

Name Location Contact details Notification requirement Flood failure

Sunny day

failure

Management Support Officer

State Emergency Service (SES) (if relevant)

Miles SES Regional Local Controller

Miles/Wandoan SES

Consulting Engineer

Brandon and Associates

8 Colamba St

Chinchilla

(07) 4668 9351 • No notification for failure but only to examine possible failure.

• Contact Engineers if any evidence of Dam wall failure is apparent.

o Examples ▪ Dam Wall leaks ▪ Dam Wall Cracks ▪ Wet areas below dam wall in

dry period (not from a rain event)

Bureau of Meteorology

Weather radar

Rainfall and river conditions forecasts

www.bom.gov.au/qld • No notification requirements

• Website to be used during a rainfall event to predict the impact of flows from the catchment into the dam

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

HAVEN PROPERTY DAM EMERGENCY ACTION PAN


Downstream affected properties

Name Location Contact details Notification requirement

Affected house 1 (main house)

Affected house 2 (cottage)

As per table 1 and 2


Dam owner responsibilities

• Develop and maintain an emergency action plan (EAP).

• Respond in accordance with the approved EAP in all dam related emergencies.

• Review and seek approval for updated EAPs as required, to ensure it is always up to date and includes current contact details for relevant parties. (must review before 1 October each year)

• Distribution of current approved EAP to all parties listed in the distribution list.

• Regular on-site monitoring and visual inspection of the conditions at the dam. The dam owner is responsible for conducting a safety evaluation of the dam and to identify any deficiency in the dam’s safety. Where deficiencies exist, the dam owner is required to take appropriate steps to minimise the potential risk of dam failure from these deficiencies.

• Provide timely and accurate notifications to all relevant parties mentioned in the notification list in the event of a dam emergency. The dam owner shall be responsible for continuously reporting the status of the dam and the event in accordance with the EAP.

• Make appropriate dam safety related decisions based on advice from a consulting engineer where appropriate. The dam owner is also responsible for authorising immediate expenditure so that urgent repair work will not be delayed.

• Report incidents and failures at the dam to the dam safety regulator in accordance with the EAP.

• Activate the EAP and maintain an incident log when emergency condition is identified at the dam.

• Periodic testing of EAP.

• Prepare Emergency Event Report (EER) and submit to the dam safety regulator within 30 business days after the end of the emergency event.

• The dam owner, has nominated as the Standby Operator, who will undertake all the roles and responsibility of this EAP in the absence of

.


Emergency events

The emergency event is a dam failure hazard or downstream release hazard that has happened. The events that will initiate emergency conditions at the dam are floods, seismic, landslide, seepage etc. The following events are defined as emergency events:

• Dam flooding

o Significant rainfall in the dam catchment with storage level rising rapidly and abnormally high spillway discharge expected

• Embankment stability issues

o Signs of distress or abnormalities in embankment such as cracking or deformation / sliding or any structural damage due to an earthquake event.

• Seepage events

o Detection of new seepage or increase in observed seepage, not due to storage rise.

EAP activation

This EAP will be activated when an emergency condition happens at the dam. There may be no need to activate this EAP if minor incidents happen (cracking, small slips, sinkholes) which will not endanger the integrity of the dam. If the incidents deteriorate to a dam failure hazard the EAP is activated. However, such minor incidents must be investigated, monitored and adequate works completed to prevent further deterioration.

Emergency management

• be alert to potential developments and maintain close vigilance during extreme events or perceived abnormal behaviour of the dam

• maintain safety requirements at all times during response actions

• take actions as outlined in the event escalation tables

• maintain communication equipment in working order



Event escalation tables

Table 1: Flood / flooding failure notification and actions

Emergency condition

level

Developing flood in the dam catchment

Potential notifications (as pre-determined with the relevant disaster group)

ALERT

Significant rainfall in catchment with lake levels rising rapidly towards Full Supply Level (FSL) and an abnormally high spillway discharge expected.

• Dam owner to undertake visual inspection of dam and recording of water level of the dam. If possible also monitor rainfall activity on the BOM radar

• Dam inspection and recording of water level at regular intervals

• Notify downstream Population at Risk (PAR)

LEAN FORWARD

Spillway flows increasing but as yet are unlikely to impact on downstream PAR and infrastructure.

• Dam owner to continue dam inspections, monitoring and recording of water level of the dam

• Dam Inspections and recording of water level at regular intervals

• Update notifications to those who received previous notifications plus notifications to those who might be impacted by increasing spillway discharges

• Update expected every 4 hour or when deemed appropriate

STAND-UP

Spillway discharge increasing with flows that are likely to impact on downstream PAR and infrastructure.

If flood activity continues a dam failure may occur due to overtopping.

Dam failure is initiated.

• Dam owner to continue dam inspections, monitoring and recording of water level of the dam if safe to do so

• Dam inspections and recording of water level at increased regular intervals

• Evacuate to high ground to avoid any impending flood / dam failure flows

• Notifications to all relevant entities including PAR, Western Downs Local Disaster Management Group and Dam Safety Regulator. Updates to be provided at least every 2 hours but also when ‘benchmark’ lake levels or discharge are being reached such as:

o discharges likely to close critical roads and other infrastructure

o record flood levels are occurring in the dam

o dam crest is being reached or is being overtopped

• Immediately notify PAR, Western Downs Local Disaster Management Group, Dam Safety Regulator and other relevant entities when the dam failure initiates


Emergency condition

level

Developing flood in the dam catchment


STAND-DOWN

Flood levels receding with lake levels dropping back towards FSL and dam releases are unlikely to impact on PAR and downstream infrastructure.

• Issue a final notification advising the end of the emergency event to previously notified entities

• Prepare Emergency Event Report (EER) and submit to Dam Safety Regulator, DNRME within 30 business days after the end of the emergency event


Table 2: Sunny day failure and seepage events notification and actions

• Identification of new seepage area

• Increase in seepage not due to storage rise

• Embankment Stability Issues

• Earthquakes

• Structural damage

Emergency condition

level Characteristics


ALERT

Identification during routine inspection of initial signs of embankment distress such as cracks.

Identification of new areas of seepage or increase in existing seepage.

• Dam owner shall inspect affected area of embankment and look for source of seepage

• Monitor the seepage and determine whether the seepage rate is increasing or monitor sign of cracks progressing or monitor identified dam issues


• Contact a suitably qualified dam engineer for advice and if necessary employ a contractor to perform adequate remedial works

LEAN

FORWARD

Cracking becoming more significant to the point where dam stability may be starting to be impaired.

Detection of signs of cloudy water in seepage - look for the source of cloudy water.

• Continue monitoring the issue

• Upgrade efforts at remedial works or load reduction if practical


• Updates expected every 4 hours or when deemed appropriate

STAND-UP

Increasing in cracking to a state where the safety of the dam is significantly impaired.

Increasing seepage discharge rate and clouding. Piping failure has initiated.

Progressive internal erosion of the embankment or foundation to form an open conduit or a pipe and the dam failure is likely.

• Continue monitoring the condition of the dam and the issue if safe to do so

• Continue remedial work or load reduction if safe to do so

• Evacuate to the high ground if dam failure is anticipated

• Notify downstream Population at Risk (PAR), Western Downs Local Disaster Management Group and the Dam Safety Regulator that the dam is likely to fail

• Updates expected every 2 hours or when deemed appropriate

STAND-DOWN

Remedial works completed and there’s no risk of failure or it is determined that the issue is

• Issue a final notification advising the end of the emergency event to previously notified entities


Emergency condition

level Characteristics


manageable and is not going to develop into a failure condition.

Failure occurs and the reservoir drains.

• Complete the remedial works and confirm that there’s no risk of dam failure

• Prepare Emergency Event Report (EER) and submit to Dam Safety Regulator, DNRME within 30 business days after the end of the emergency event



Plan for damage control

Assess the severity of the dam defect requiring damage control resulting from storm, flood or any other factor

Is notification required?

*If unable to secure repair services, notify emergency contacts. Remember that once started, progress to failure may be rapid

Enact emergency action plan

Select the personnel, plant, equipment and materials to assist in damage mitigation repair from the listing below

Personnel sources Plant and equipment

sources Materials sources

Personnel sources

Name Phone Address

Consulting engineer

Brandon and Associates

(07) 4668 9351 8 Colamba St

Chinchilla

Labour Ison Contracting or Zeller Earthmoving

0427 628 107 0427 628 494

Chinchilla Chinchilla

Labour Western Downs Regional Council

1300 268 624 Miles (In case of an emergency WDRC may be able to offer a service closer than Chinchilla)

Plant and equipment sources

Name Phone Address

Equipment Ison Contracting or Zeller Earthmoving

0427 628 107 0427 628 494


Plant Ison Contracting or Zeller Earthmoving

0427 628 107 0427 628 494


Equipment and Plant

Western Downs Regional Council


Material sources

Name Phone Address


Clay Ison Contracting or Zeller Earthmoving

0427 628 107 0427 628 494


Sand, gravel or rock

Ison Contracting or Zeller Earthmoving

0427 628 107 0427 628 494


Geofabric sheet, plastic sandbags

Keith Crawleys Industrial and Rural Supplies

07 4662 7415 Crawley Lane Chinchilla

Materials Western Downs Regional Council




Location maps

Haven Property Dam is approximately 15.5km or 30 mins from Drillham (currency of Google imagery: 2015)

Dashwood Dam – Dam ID 1007

Haven Property


Downstream Points of Interest

The two PAR dwellings are approximately 530 m downstream of the dam embankment (currency of Google imagery: 2015)

Dashwood Dam – Dam ID 1007

Auxiliary SpillwayPrimary Spillway

Direction of Flow

Tributary

Haven Property

approved by the delegate of the chief executive

Documents