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Rosewood Detention Basin Emergency Action Plan
EMERGENCY ACTION PLAN
ROSEWOOD DETENTION BASIN at
ROBLYN & MATTHEW STREETS, ROSEWOOD
September 2019
This Emergency Action Plan has been prepared to comply with the conditions notified under the Water Supply (Safety and Reliability) Act 2008, Chapter 4.
WIDTJ Text Box
Approved by the delegate of the Chief Executive, Department of Natural Resources, Mines and Energy until 1 May 2022
Emergency Activation Quick Reference
The Emergency Action Plan (EAP) for Rosewood Detention Basin covers four emergency conditions evaluated within this document. Use the following table
to select the relevant section of the EAP that deals with the emergency condition. Note that the Dam Operator is responsible for the decision to activate the
EAP.
Activation Level Alert Lean Forward Stand-Up Stand-Down Decision Authority Dam Duty Officer Dam Operator Dam Operator & Local
Disaster Co-Coordinator Dam Operator
Activation trigger for emergency conditions relating to dam hazards Flood Event with No Structural Issues (Flow Chart A)
Water level = 77.58 mAHD (Automatic Flood Gauge Level = 2.98 m) and rising
EAP activated at water level = 78.50 mAHD (Automatic Flood Gauge Level = 3.9 m)
Water level = 79.90 mAHD (Automatic Flood Gauge Level = 5.3 m)
Water level = 77.50 mAHD (Automatic Flood Gauge Level = 2.9 m) and falling with no more rain
Flood Event with Structural Issues (Flow Chart B)
Water level = 77.58 mAHD (Automatic Flood Gauge Level = 2.98 m) and rising
EAP activated at water level = 78.50 mAHD (Automatic Flood Gauge Level = 3.9 m)
Water level = 79.90 mAHD (Automatic Flood Gauge Level = 5.3 m)
Water level = 77.50 mAHD (Automatic Flood Gauge Level = 2.9 m) and falling with no more rain
Earthquake Event (Flow Chart C) Earthquake occurs of magnitude 4 or greater
Rainfall Event Imminent - No safety issue identified/remaining
Terror Event (Flow Chart D) Terror event occurs Rainfall Event Imminent - No safety issue identified/remaining
Rosewood Detention Basin Emergency Action Plan
Page 4 of 48
TABLE OF CONTENTS
1 Introduction .................................................................................................................................... 6
1.1 Risks and Issues ....................................................................................................................... 8
1.2 Technical Data ......................................................................................................................... 9
1.3 Monitoring Systems ................................................................................................................ 9
1.4 Maintenance and Inspections ................................................................................................. 9
1.5 Glossary ................................................................................................................................. 11
2 Notification Listing Flow Chart ...................................................................................................... 12
2.1 Notification Flow Chart ......................................................................................................... 12
2.2 Emergency Response Notification and Contact List ............................................................. 15
2.3 Impacted Persons / Property ................................................................................................ 16
2.4 Road Inundation and Road Closure ...................................................................................... 17
2.5 Evacuation Routes / Evacuation Centre ................................................................................ 19
2.6 PAR Preparedness Messaging Plans ..................................................................................... 19
3 Roles and Responsibilities ............................................................................................................. 20
4 Emergency Events and Action List ................................................................................................ 22
4.1 Potential Emergency Events and Responses ........................................................................ 22
4.2 Possible Scenarios Leading to Activation of the EAP ............................................................ 24
LIST OF FIGURES
Figure 2-1 – Rosewood EAP Notification Flow Chart ............................................................................ 14
Figure 4-1 – Flow Chart A – Flood Inflow, No Embankment Issues ...................................................... 26
Figure 4-2 – Flow Chart B – Flood Inflow, Embankment Issue Identified ............................................. 33
Figure 4.3 – Flow Chart C – Earthquake Event ...................................................................................... 40
Figure 4.4 – Flow Chart D – Terror Event .............................................................................................. 44
LIST OF TABLES
Table 1-1 – Storm Event Probability versus Storage Level ..................................................................... 7
Table 1-2 – Rosewood Detention Basin Technical Data ......................................................................... 9
Table 1-3 – Rosewood Detention Basin Maintenance & Inspection Schedule ..................................... 10
Table 1-4 – Glossary .............................................................................................................................. 11
Table 2-1 – Alert Level Definitions ........................................................................................................ 12
Table 2-2 - Notification Contact List ..................................................................................................... 15
Rosewood Detention Basin Emergency Action Plan
Page 5 of 48
Table 2-3 – Flood Level Designation ..................................................................................................... 17
Table 2-4 – Road Closures for Different Flood Levels (in priority order) .............................................. 18
Table 3-1 – Roles and Responsibilities .................................................................................................. 20
Table 4-1 – Possible Dam Safety Issues ................................................................................................ 22
Table 4-2 – Flow Chart A – Recommended Actions .............................................................................. 27
Table 4-3 - Flow Chart B – Recommended Actions ............................................................................... 34
Table 4-4 – Modified Mercalli Scale ...................................................................................................... 39
Table 4-5 – Flow Chart C – Recommended Actions .............................................................................. 41
Table 4-6 – Flow Chart D – Recommended Actions .............................................................................. 45
LIST OF APPENDICES
Appendix A – Mapping .......................................................................................................................... 40
Appendix B – Supporting Information .................................................................................................. 44
47
48
Rosewood Detention Basin Emergency Action Plan
Page 6 of 48
1 Introduction
This Emergency Action Plan (EAP) is part of a suite of dam safety and management documents provided by Ipswich City Council (ICC). When using this plan, reference is also to be made to the current version of Ipswich City Council Local Disaster Management Plan (LDMP). ICC is the owner of Rosewood Flood Detention Basin and any emergency response in relation to the basin is to be managed and directed as per this EAP.
The Rosewood Detention Basin is a flood detention structure located on 2 watercourses immediately upstream of the township of Rosewood. The embankment of the detention basin is accessed via parkland off Roslyn and Matthew Streets, Rosewood. The detention basin was constructed to reduce the impact of flooding on the township of Rosewood and downstream areas, by storing runoff from two tributaries upstream of Rosewood and releasing them at a reduced rate, lowering the probability of inundation of properties and infrastructure.
In the case where there is no storm event occurring within the catchment the basin is effectively dry and as such Sunny Day Failure is no considered within this document. The Rosewood Detention Basin was constructed as an earth embankment over 2001 and 2002, with a height of approximately 7 meters and a total length in the order of 420 meters. A spillway located in the embankment towards the left abutment provides the ability to discharge safely when the water level in the basin exceeds capacity.
Two concrete pipes beneath the basin embank