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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