Emergency Action Plan

Connolly Dam

September 2020

This document is in draft form. The contents, including any opinions, conclusions or recommendations contained in, or which may be implied from, this draft document must not be relied upon. GHD reserves the right, at any time, without notice, to modify or retract any part or all of the draft document. To the maximum extent permitted by law, GHD disclaims any responsibility or liability arising from or in connection with this draft document.

Emergency Activation Quick Reference Guide

The Emergency Action Plan (EAP) for Connolly Dam covers five emergency conditions. Use the following table to select the relevant section of the EAP that deals with the emergency condition:

Emergency Activation Level Water Level Scenario Actions Affected Areas Warning Message Event

Sunny Day ALERT N/A  Increasing flow rate of seepage, new area or seepage areas Section 4.3 Appendix E Appendix C3 Failure contains earth material  Overturning, sliding or cracking identified at dam LEAN FORWARD N/A  Seepage flow rate is increased further and cannot be controlled Section 4.3 Appendix E Appendix C3  Structural movement has increased Table 3 STAND UP N/A  Piping condition has been established. Section 4.3 Appendix E Appendix C3  Dam failure is considered a possibility due to an identified failure Table 4 or following advice Flooding ALERT RL 537.6  Storage at FSL (RL 537.64) Section 5.3 Appendix F Appendix C3  Expected to rise < 1.0 m  Rainfall over all of catchment and forecast to continue LEAN FORWARD RL 538.6  Reservoir Level > 1.0 m above FSL (RL 538.64) Section 5.3 Appendix F Appendix C3  Expected to reach DCL Table 1  Rainfall continuing STAND UP 1 RL 540.5  Reservoir Level at Dam Safe Level (RL 540.58) Section 5.3 Appendix F Appendix C3  Water level > 2.9 m above FSL Table 2  1:2000 AEP flood STAND UP 2 RL 541.4  Storage Level at 1.0 m over Dam Safe Level (RL 541.58) Section 5.3 Appendix F Appendix C3  Depth of water over spillway > 3.8 m and overtopping the dam Table 2 crest by 0.1 m Earthquake ALERT N/A  Any report of seismic activity Section 6.3 Refer to Sunny Day Failure Refer to Sunny Day Failure Terrorism ALERT N/A  Any report of terrorism or High Energy Impact Section 7.3 Refer to Sunny Day Failure Refer to Sunny Day Failure Toxic Spills LEAN FORWARD N/A  Any report of toxic spills Section 8.3 - - STAND UP N/A  Confirmation of report of toxic spill Section 8.3 - -

Southern Downs Regional Council | Emergency Action Plan | Connolly Dam | i Preparation and Approval

Authorisation: The issue of the Connolly Dam EAP is approved by the Director Infrastructure Services, SDRC

Signed: ______

Dated: ______30 September 2020

Revision Date Revision Description Number

1 August 2015 Updated after Regulators commentary and new FIA 2 September 2016 Updated after Regulators commentary 3 November 2017 New Plan required by 1 June 2018 Regulator (condition of Approval) 4 August 2018 Complete update and regulators comments addressed 5 September 2019 Annual review – minor amendments to contact details and organisational structure 6 September 2020 Annual review – minor amendments to contact details and organisational structure

According to the Act, the owner of a referrable dam must, before 1 October each year –

(a) Review the approved emergency action plan for the dam; and

(b) Give the chief executive – i. A notice stating whether or not the owner proposes an amendment of the plan because of the review;

and ii. If the owner proposes an amendment – a copy of the plan including the proposed amendment

Southern Downs Regional Council | Emergency Action Plan | Connolly Dam | i Distribution List

Copy Number Position Location

1 Mayor / Chair LDMG Southern Downs Regional Council 64 Fitzroy Street, Warwick Qld 4370 2 CEO of SDRC/ Local Disaster Southern Downs Regional Council Coordinator of Southern Downs Local 64 Fitzroy Street, Warwick Qld 4370 Disaster Management Group 3 Director of Infrastructure Services / Dam Shared Hard Copy Manager Infrastructure Services Department, Warwick Southern Downs Regional Council 64 Fitzroy Street, Warwick Qld 4370 4 Dam Engineer Infrastructure Services Department, Warwick Southern Downs Regional Council 11 Depot Road, Warwick Qld 4370 5 Dam Supervisor / Dam Operator Infrastructure Services Department, Warwick Southern Downs Regional Council 11 Depot Road, Warwick Qld 4370 6 Operator Assistant Warwick Water Treatment Plant, Southern Downs Regional Council Tooth Street, Warwick Qld 4370 7 Director, Dam Safety Chief Executive Department of Natural Resources, Mines Department of Natural Resources, Mines and Energy and Energy PO Box 15216, City East Qld 4002 8 Officer-in-Charge (Warwick) Police Station, Warwick Queensland Police Service 86 Fitzroy Street, Warwick 9 SDRC Disaster Management Coordinator Infrastructure Services Department, Warwick Southern Downs Regional Council 64 Fitzroy Street, Warwick Qld 4370

Southern Downs Regional Council | Emergency Action Plan| Connolly Dam | ii Telephone and Email Notification List

Authorisation: The issue of the Connolly Dam Telephone and Email Notification List is approved by the Director Infrastructure Services, SDRC

Signed: ______Dated: ______30 September 2020

Revision Revision Description Revision Date Number 1 Telephone and Radio Notification List - updated December 2008 2 - November 2010 3 Telephone and e-mail updated & plan reviewed September 2013 4 Telephone and e-mail updated & plan reviewed May 2014 5 Plan reviewed per OWSR requirements & new FIA July 2015 6 Plan reviewed per Water Planning and Regulation requirements September 2016 7 Full review of document August 2018 8 Plan reviewed per Water Planning and Regulation requirements September 2019 9 Plan reviewed per Water Planning and Regulation requirements September 2020

Position Name Phone Phone A/H Email

Southern Downs Regional Council

Chief Executive Officer Director of Infrastructure Services

Local Disaster Coordinator Dam Manager Dam Engineer Dam Supervisor Dam Compliance Officer Dam Operator Operator assistant DNRME Operations Support 1300 596 709 All events reporting Director Dam Safety (Water Supply) [email protected] Queensland Police Service Officer in Charge (Warwick) 4660 4444 SES Warwick

Nominated Dam Safety Consultant Technical Director Dams, GHD Counter Terrorism National Security Hotline 1800 123 400 000 / 112

A compilation of the properties and sites considered at risk from a Dam Crest Flood Failure (DCFF) has been attached as Appendix F. An Emergency Alert polygon has been lodged with Queensland Fire and Emergency Services to alert properties at risk (Appendix C). The contact details of owners and occupiers of properties likely to be affected within one hour of DCFF are listed in Appendix I.

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Maps showing the population at risk at neighbourhood level are attached as Appendix E (Sunny Day Failure) and Appendix G Probable Maximum Flood Failure.

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Table of contents

1. References, Abbreviations and Definitions ...... 1 1.1 References ...... 1 1.2 Purpose ...... 1 1.3 Updates and Training...... 1 1.4 Abbreviations and Acronyms ...... 2 1.5 Definitions ...... 3 2. Dam Details ...... 6 2.1 Statistical Summary of Dam Features ...... 6 2.2 Dam Access ...... 7 2.3 Monitoring ...... 9 2.4 Critical Infrastructure ...... 12 3. Roles and responsibilities ...... 14 3.1 Local Disaster Management Group ...... 14 3.2 SDRC Organisational Structure & Responsibilities ...... 15 3.3 SDRC Staff ...... 15 3.4 Communication ...... 16 3.5 Issuing Flood Warning and Evacuation Notices ...... 16 4. Emergency Conditions – Sunny Day Failure ...... 17 4.1 Overview ...... 17 4.2 Activation triggers ...... 17 4.3 Actions – Sunny Day Failure ...... 18 5. Emergency Conditions – Flooding ...... 23 5.1 Overview ...... 23 5.2 Activation triggers ...... 23 5.3 Actions - Flooding ...... 25 6. Emergency Conditions – Earthquake ...... 30 6.1 Overview ...... 30 6.2 Activation triggers ...... 30 6.3 Actions - Earthquake...... 31 7. Emergency Conditions – Terrorism or High Energy Impact ...... 33 7.1 Overview ...... 33 7.2 Activation triggers ...... 33 7.3 Actions – Terrorism ...... 34 8. Emergency Conditions – Toxic Spills ...... 36 8.1 Overview ...... 36 8.2 Activation triggers ...... 36 8.3 Actions – Toxic Spills ...... 37 Appendix A – Technical Information ...... 40

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Appendix B – Record Sheets ...... 43 Appendix C – Emergency Alert Information ...... 49 Appendix D – Mapping Overview ...... 57 Appendix E – Sunny Day Failure Inundation Maps ...... 59 Appendix F – Dam Crest Flood Failure Inundation Maps ...... 67 Appendix G – Probable Maximum Flood Inundation Maps ...... 70 Appendix H – Checklist for Dam Operators ...... 78 Appendix I – Priority Contact List ...... 79 Appendix J – PAR Contact List ...... 80 Appendix K – LDMG Contact List ...... 96

Table index

Table 1 – Dam Crest Flood Failure Emergency Message Priority PAR ...... 53 Table 2 - Dam Crest Flood Failure Emergency Message for PAR ...... 54 Table 3 - Sunny Day Failure Emergency Message for Priority PAR ...... 55 Table 4 – Sunny Day Failure Emergency Message for PAR ...... 56

Figure index

Figure 1 Connolly Dam levels ...... 7 Figure 2 Connolly Dam site ...... 7 Figure 3 Access routes to Connolly Dam ...... 8 Figure 4 Monitoring Locations ...... 11 Figure 5 Catchment Boundary ...... 12

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1. References, Abbreviations and Definitions

1.1 References

This EAP forms part of the overall Dam Safety Documents for Connolly Dam. Reference documents include:

 Dam Safety Condition Schedule (ID # 0252)

 Connolly Dam Data Book

 Connolly Dam Operation and Maintenance Manual  SDRC Standard Operating Procedures

 DNRME Emergency Action Plan Referable Dam Guideline

 Queensland Weather Information (Flood Warning) http://www.bom.gov.au/qld/flood/index.shtml?ref=hdr

1.2 Purpose

The purpose of this EAP is:

 to identify emergency conditions that could occur at Connolly Dam and the area likely to be affected for each condition

 to prescribe emergency actions taken by the dam owners and operating personnel in identifying and responding to emergency conditions and notifying relevant entities. It is possible for more than one emergency condition to exist at Connolly Dam at the one 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 emergency conditions at Connolly Dam by SDRC and the communication and notification of emergency conditions to the LDMGs and broader community. However, the EAP sits within the broader emergency response framework. This EAP has been developed to be consistent with and support the objectives of the SDRC’s LDMP.

1.3 Updates and Training

Under the Act, the owner of a referable dam must have an approved Emergency Action Plan (EAP) for the dam. This EAP for Connolly Dam is to be reviewed by SDRC and the LDMG on an annual basis. This EAP for Connolly Dam is to be included in annual training for dam operators, key council staff involved in the management / operation of the dam and any response agencies.

A dam safety exercise shall be conducted every two years (prior to wet season) as part of the EAP review process. The exercise may be undertaken as a “Desk Top” exercise or alternatively as a field exercise where the lines of communication and the responses of the different agencies is tested.

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1.4 Abbreviations and Acronyms

Acronym Term

AEP Annual Exceedance Probability AHD Australian Height Datum BOM Bureau of Meteorology CEO SDRC Chief Executive Officer cm centimetre DCF Dam Crest Flood DCFF Dam Crest Flood Failure DCL Dam Crest Level DDMG District Disaster Management Group DE SDRC Dam Engineer DIS SDRC Director Infrastructure Services DM SDRC Dam Manager DNRME Queensland Department of Natural Resources, Mines and Energy DO SDRC Dam Operator DS SDRC Dam Supervisor EAP Emergency Action Plan EER Emergency Event Report EL Elevation Level FIA Failure Impact Assessment FSL Full Supply Level ICC Incident Control Centre LDC Local Disaster Coordinator LDCC Local Disaster Coordination Centre LDMG Local Disaster Management Group LDMP Local Disaster Management Plan m metre ML Mega litre mm millimetre N/A Not Applicable OA SDRC Operator Assistant PAR Population at Risk PMF Probable Maximum Flood PMFDF Probable Maximum Precipitation Design Flood QAS Queensland Ambulance Service QFES Queensland Fire and Emergency Services QPS Queensland Police Services Qld Queensland RL Reduced Level SDF Sunny Day Failure SDRC Southern Downs Regional Council SES State Emergency Services SMS Short message service

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1.5 Definitions

The meaning of terms used in this section are set out in accordance with the relevant legislation or as defined by operator requirements

Terms set out in section 352A of the Water Supply (Safety and Reliability) Act (QLD, 2008) Dam hazard For a dam, means a reasonably foreseeable situation or condition that may: (a) cause or contribute to the failure of the dam, if the failure may cause harm to persons or property; or (b) require an automatic or controlled release of water from the dam, if the release of the water may cause harm to persons or property. Dam hazard event For a dam, means an event arising from a dam hazard if: (a) persons or property may be harmed because of the event; and (b) a coordinated response involving 2 or more of the relevant entities mentioned in paragraphs (b) to (d) of the definition relevant entity is unlikely to be required to respond to the event; and (c) the event is not an emergency event. Emergency event For a dam, means an event arising from a dam hazard if: (a) persons or property may be harmed because of the event; and (b) any of the following apply (i) a coordinated response involving 2 or more of the relevant entities mentioned in paragraphs (b) to (d) of the definition relevant entity is likely to be required to respond to the event; (ii) the event may arise because of a disaster situation declared under the Disaster Management Act; (iii) 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 Relevant entity For a dam, means each of the following under the emergency action plan for the dam: (a) 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; Examples for paragraph (a)  the owners of parcels of farm land adjacent to the dam  residents of a township (b) each local group and district group for the emergency action plan; (c) each local government whose local government area may be affected if a dam hazard event or emergency event were to happen for the dam; (d) the chief executive; (e) another entity the owner of the dam considers appropriate. Example for paragraph (e) - the Queensland Police Service Terms consistent with Queensland disaster management arrangements 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.

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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.  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 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. 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 LDMG. BOM flood level The three levels of flooding are: classifications  Minor flooding: This causes inconvenience such as closing of minor roads and the submergence of low-level bridges and makes the removal of pumps located adjacent to the river necessary  Moderate flooding: This causes the inundation of low-lying areas requiring the removal of stock and / or the evacuation of some houses. Main traffic bridges may be closed by flood waters  Major flooding: This causes inundation of large areas, isolating towns and cities. Major disruptions occur to road and rail links. Evacuation of many houses and business premises may be required. In rural areas, widespread flooding of farmland is likely. Chemical spill / The contamination of water in the storage of the dam that could create a public toxic condition safety or downstream release hazard. Earthquake A sudden release of energy in the Earth’s crust or upper mantle, usually caused by a 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, longitudinal or traverse cracking in an embankment dam that could lead to piping or overtopping if the settlement is greater than the available freeboard  Initiation of seepage lines in the foundations or abutments that could lead to piping  Liquefaction of foundation sands leading to slope failure and loss of freeboard causing overtopping if the settlement is greater than the available freeboard  Damage and potential inoperability of appurtenant works. Flood release A flood release from a dam occurs when catchment inflows raise the storage level above 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

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Plane strike or The impact of a plane, meteorite, or other high-energy item on or in close vicinity other impact of a dam that could damage the dam structure or create a wave that could overtop the dam. Vandalism or A deliberate attempt to damage or fail a dam Terrorist Activity

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2. Dam Details

Connolly Dam is located on Rosenthal Creek, approximately 16 km south of Warwick. Construction was completed in 1927. The dam is owned and operated by SDRC.

The purpose of the dam is to supplement the Leslie Dam water supply for Warwick. Water is drawn from the storage through variable level inlets on the Intake Tower, through pipeline in the Outlet Tunnel under the right abutment of the dam, to the Valve House at the toe of the embankment. Valves in the Valve House control the flow in a gravity pipeline to Warwick. The layout of the dam is shown in Figure 2.

2.1 Statistical Summary of Dam Features

Dam Name Connolly Dam (also known as Silverwood Dam) Type of Dam Zoned embankment with puddle clay core backed by concrete core wall Dam Owner Southern Downs Regional Council Construction Completed 1927 Co-ordinates Latitude 28° 21' 35.97" S Longitude 152° 0'9.42" E Property Description Lots 1 and 2 RP47924

Watercourse Rosenthal Creek Catchment area 134 km2 Length of spillway 73.5 m Maximum height of dam 21 m Spillway level (Full Supply Level) RL 537.68 m Dam Crest Level (non overflow section) RL 541.87 m Storage capacity at FSL 2,157 ML Outlet Works Dry well intake tower with three intake levels, RC pipe through the embankment and a valve house at the toe of the embankment Maximum historical flood level (2011) RL 538.78 m Maximum Incremental PAR 136 Dam Crest Flood Failure Failure Impact Rating Category 2

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Figure 1 Connolly Dam levels

Figure 2 Connolly Dam site

2.2 Dam Access

Access routes to the dam are shown in Figure 3 and are described below based on the colour- coding included in the figure.

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Figure 3 Access routes to Connolly Dam

2.2.1 Normal Route from Warwick (Blue)

Travel south from Warwick on the New England Highway. After 5.7 km, turn left onto Rosenthal Road and after travelling 290 m turn right into Connolly Dam Road.

Travel 10.1 km along Connolly Dam Road and turn right into the dam access road.

Proceed another 300 m along the gravel road to picnic area. This brings you to the right abutment of the spillway.

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2.2.2 Alternative Route from Warwick (Green)

Travel south east from Warwick via Old Stanthorpe Road for 14.5 km.

Turn right into Blake Road and travel for 6.6 km. Turn right at end of road and travel for 750 m along Connolly Dam Road and turn right into the dam access road, there is a padlocked gate.

Proceed another 300 m along the gravel road to picnic area. This brings you to the right abutment of the spillway.

2.3 Monitoring

The monitoring stations are shown in Figure 4 and the catchment boundary is shown in Figure 5.

2.3.1 BOM website

Rainfall data are located on the webpage (under the Upper Condamine section): http://www.bom.gov.au/cgi-bin/wrap_fwo.pl?IDQ60367.html

Relevant stations are:

 ‘Connolly Dam AL’ (station 041477)

 ‘Dalveen’ (station 41022)

 ‘Warwick AL’ (station 041534)

 ‘Warwick (Scots College) TM’ (station 041534) To determine flood levels in Warwick, the ‘Condamine River at Warwick’ station is used (located on McCahon Bridge).

Reservoir levels are located on the webpage: http://www.bom.gov.au/fwo/IDQ65396/IDQ65396.041532.tbl.shtml

The relevant station is ‘Rosenthal Ck at Connolly Dam’ (Station 041532).

2.3.2 Enviromon

These are automatic monitoring stations and may be remotely monitored in real time using the BOM "Enviromon" software which is installed on a number of SDRC computers. A list of Council Officers having access to Enviromon is listed below. Various Council Officers are also on a 24 hour SMS communication protocol enabled by this system list to facilitate continuous monitoring.

The following users have login access to Enviromon:

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Figure 4 Monitoring Locations

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Figure 5 Catchment Boundary

2.4 Critical Infrastructure

Critical infrastructure impacted by flooding downstream of Connolly Dam includes:

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Stream Name & Location Type Rosenthal Creek New England Highway (152.013811, -28.244804) Rosenthal Creek Bracker Road (152.028417, - Two-span RC Bridge 28.239519 Bracker Creek McEvoy Street (152.039304, -28,225714 Rosenthal Creek McEvoy Street, (152.039088, 5 span timber bridge -28.227579) Condamine River OO Madsen Bridge, Helene Road Bridge Street, (152.037871, - 28.208851 Condamine River (152.042041, -28.211093) Rail Bridge Condamine River McCahon Bridge, Victoria Road bridge Street (152.025435, - 28.208813) Condamine River Cox’s Bridge, Victoria Street, Road bridge (152.011279, -28.206763) The OO Madsen Bridge is closed at approximately 6.6 m and the McCahon Bridge is closed at approximately 6.7 - 6.8 m on the gauge ‘Condamine River at Warwick’ which is located at the McCahon Bridge.

Other bridge closures are Cox’s Bridge at 2.2 m, Wallace St Bridge at 5.5 m, Junabee Bridge at < 6 m and Park Road at the weir at 2.2 m. A SDF is less than a flood event of 6.0 m on the gauge (minor flood) and a DCFF is similar to 8.5 m on the gauge at PMF is higher than a 9.5 m flood on the gauge.

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3. Roles and responsibilities

3.1 Local Disaster Management Group

The Southern Downs Local Disaster Management Group (LDMG) is established in accordance with Section 29 of Disaster Management Act 2003 to ensure safety for the regional community.

As part of its role, the LDMG develops, reviews and implements a Local Disaster Management Plan (LDMP). This Emergency Action Plan (EAP) fits under the Southern Downs LDMP and should be used in conjunction with the LDMP.

The current membership of the Local Disaster Management Group, with contact details, is listed in Appendix K of this Plan. Southern Downs Regional Council (SDRC) is the lead agency for any Flood Disaster. Refer to the LDMP for a full listing of all agencies and their responsibilities.

Role Responsibilities

Southern Downs Local Disaster Management Group (LDMG) Local Disaster  Undertake functions as identified in the Southern Downs Local Disaster Management Group Management Plan (LDMP), Section 3.4 Roles and responsibilities  Coordination of responses if the event escalates to include a wider area  Review the data and information received  Issuing of warnings / evacuation notice to residents at risk, and evacuating residents  Coordinate disaster operations including external response agencies  Assign resources as required to support the Dam Operator  Issue media alerts and information  Maintain a log of the event, actions taken and all communications  Issue media alerts and information.  Issue emergency alerts and warnings to the population at risk.  Assist police and SES to evacuate residents at risk. Southern Downs Local Disaster Coordinator (LDC) Regional Council  Review the data and information received  Advise the LDMG of the developing issue or the event  Alert / Advise the emergency response agencies to a developing situation and the possible need to mobilise and implement emergency actions  Implement the local disaster management plan as required  Coordinate the response and establish a Local Disaster Coordination Centre (LDCC) including provision of resources  Convene the LDMG  Assign resources as required to support the Dam Operator  Issue media alerts and information  Issue warning and evacuation messages  Assist police and SES to evacuate residents at risk Any actions taken under this Emergency Action Plan must be consistent with the intent of the Disaster Management Plan and follow the stipulated roles and responsibilities.

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3.2 SDRC Organisational Structure & Responsibilities

Chief Executive Officer

Director of Infrastructure Services

Manager Water (Dam Manager)

Treatment Plant Network Senior Water Regulatory Principal Engineer (Dam Coordinator Officer Engineer) (Dam Supervisor) (Dam Compliance Officer)

Water Treatment Supervisor (Dam Operator)

Water Treatment Plant Officer (Operator Assistants)

3.3 SDRC Staff

Role Responsibility

Dam Supervisor / Dam Operator /  To monitor and record conditions at the dam during an event, Operator Assistants (DS/DO/OA) (either remotely via the BOM website or at the dam itself if safe), and record relevant information in the record sheets included in this EAP. Dam Engineer / Dam Manager  To analyse and respond to information from the Dam Supervisor / (DM/DE) Dam Operator / Operator Assistants and keep the Director of Engineering Services informed of the status of the emergency.  Initiate the actions for the various activity levels and notifications.  After a STAND UP Flood event, an earthquake event or Sunny Day Failure event where damage to the dam is evident, engage nominated dam safety consultant to undertake a dam safety inspection and submit the report to the DIS for review. Director of Infrastructure Services  Receive information on emergency situations and liaise with the (DIS) LDC and Director Dam Safety.  Notification to the LDC and CEO.  Report to SDRC and DNRME after emergency events if any damage to the dam occurred.  Submit an EER to the Director Dam Safety. Chief Executive Officer (CEO)  Keep the media and the public informed as necessary.

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3.4 Communication

The means of communication to be engaged for this EAP shall include:-

 Landline Telephone

 Mobile Telephone (including text messaging)

 Satellite Telephone (where mobile phone coverage is not available or unreliable)  Police radio

 Email

 UHF Radio Transceiver  Facsimile

Note that both Satellite Telephone and Mobile Phone systems can be impacted by adverse weather conditions. Where possible, backup communications are to be provided.

All persons engaged in this plan shall maintain a log of any communications sent or received together with any corresponding actions taken, observations and other relevant notes (see Appendix B2 for communications log template).

3.5 Issuing Flood Warning and Evacuation Notices

The following methods of issuing flood warnings and evacuation notices (refer Appendix C3 for message templates) are to be used for Connolly Dam. Flood warnings and evacuation notices are issued by the LDMG once approved by the LDC.

 Use of loud speakers via a vehicle travelling the streets

 Door knocking

 Local emergency response personnel making public broadcasts

 Local media releases (including Radio and Television)

 The sounding of a siren or other audible warning devices to alert both general and transient populations

 Social media

The National Emergency Alert System is also a means of issuing alerts and warnings via SMS (Text) messages through nominated polygons. The Emergency Alert Request for Connolly Dam, along with the nominated polygons are included in Appendix C1 and Appendix C2. The Emergency Alert Request for Connolly Dam should only be used for the STAND-UP alert level. The Emergency Alert Request for Connolly Dam is to be issued by the LDMG at the request of the LDC.

For those on the priority Contact list, contact is made via the subscribed Go Fax SMS service, which is used to send out group SMS to those affected.

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4. Emergency Conditions – Sunny Day Failure

4.1 Overview

The emergency action described in this section relates to a potential dam failure hazard due to either:

 Piping as a result of uncontrolled seepage through either the embankment, foundation or abutments

 Loss of freeboard due to slope failure

If one or more monoliths become unstable, a dam failure may result. If movement is detected early, remedial actions may be possible depending on the nature of the damage.

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 with no concurrent flooding, then the affected area is the level shown by the SDF line on the maps in Appendix E. This extent is less than a minor flood level

4.2 Activation triggers

4.2.1 Seepage Indicators

Seepage Indicators Alert Increasing flow rate of seepage or new area of seepage through the dam wall, foundation or abutments. Lean Forward Seepage flow rate increases further or, new area of seepage is observed through the embankment, foundation or abutments. Seepage water is cloudy and appears to be carrying soil material. Seepage increases cannot be controlled Stand Up Piping condition has been established. Dam failure is considered a possibility due to an identified failure or following advice provided by dam consultant carrying out field inspection Stand Down Seepage through the dam is controlled and there are no indicators of potential dam failure. Risk assessment has determined that failure risk has reduced.

4.2.2 Embankment / abutment slope stability indicators

Embankment / Abutment Slope Stability Indicators Alert Indications of movement of the embankment or abutments noted such as cracking, bulging, or displacement Lean Forward Increase in cracking, bulging, or displacement of embankment or abutments, or seepage Stand Up Obvious displacement of part of the embankment or abutments Stand Down Risk assessment has determined that failure risk has reduced.

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4.3 Actions – Sunny Day Failure

Dam Supervisor / Dam Operator / Operator Dam Manager / Dam Engineer (DM/DE) Director Infrastructure Services (DIS) CEO Assistants (DS/DO/OA)

ALERT 1. Ensure all items listed on checklist (Appendix 1. Observations and reports are to be acted 1. If reports from the DM/DE confirm that an 1. Reply to public / media H) are stowed in vehicle upon when received in order to ensure emergency situation is developing, requests for event 2. Immediately report to the DM/DE any sudden timely recognition of a potential immediately inform: information increases or changes in seepage rates from dangerous situation. o The LDC - Road and Rail lines shall the downstream face or toe of the dam or the 2. Where confirmed by DS/DO/OA, inform be signed for possible closure or foundation / abutments in the immediate Local Disaster Manager and DIS. closed as appropriate. Notify surrounds of the dam OR evidence of 3. Travel to the dam as a matter of urgency. downstream residents at risk by cracking, bulging, or displacement of the Measure and review the rate of seepage telephone / SMS. Evacuate embankment or abutments. flow OR cracking, bulging, or downstream residents if time allows. 3. Provide information and assist the DM/DE in displacement of the embankment or o The Director Dam Safety monitoring areas of dam safety concern. abutments and if there is an adverse o The CEO 4. If dam failure occurs, immediately report to change in conditions immediately report 2. Initiate an escalation to LEAN FORWARD the DM/DE. to the LDC and DIS and advise to if seepage or movement / cracking is 5. Record the reservoir level at 60 minute escalate to LEAN FORWARD. increased and new areas of seepage, intervals (Appendix B3) and record the rainfall 4. If necessary, obtain specialist technical cracking, bulging, or displacement are (if any) at 30 minute intervals (Appendix B4). advice from one of the nominated dam observed or damage to the dam is 6. At least daily, inspect and take photographs safety consultants. observed (time stamped) of the embankment, spillway 5. If possible, carry out emergency repairs to 3. Maintain contact hourly with DM/DE until and surrounds for any springs, deformations, prevent further adverse conditions the end of the event or until rectified. and cracks. Monitor if increasing. developing which may result in the failure 4. Arrange for any additional steps to be 7. Submit all sheets and photographs to the of the dam. Arrange for construction taken to mitigate the effects of the DM/DE twice daily. details to be recorded damage. The Director Dam Safety may 8. Record data and information and maintain log 6. Obtain prognoses of weather conditions choose to direct emergency activities of all communications (Appendix B1 & B2). from BOM to determine the likelihood of based on the extent and type of the bad weather preventing or hampering damage repairs

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Dam Supervisor / Dam Operator / Operator Dam Manager / Dam Engineer (DM/DE) Director Infrastructure Services (DIS) CEO Assistants (DS/DO/OA)

7. Record data and information and maintain 5. Record data and information and maintain log of all communications (Appendix B1 & log of all communications (Appendix B1 & B2). B2). LEAN 1. Report to the DM/DE any sudden increases or 1. Deploy second DO/OA to site 1. If reports from the DM/DE confirm that an 1. Reply to public / media FORWARD changes in seepage rates from the 2. Request DS/DO/OA to continue emergency situation is developing, requests for event downstream face or toe of the dam or the observations at minimum of three hourly immediately inform: information foundation / abutments in the immediate and inspect the dam and structures for o The LDC - Road and Rail lines shall surrounds of the dam OR evidence of signs of damage where data indicates be signed for possible closure or cracking, bulging, or displacement of the sudden unexplained increases in seepage closed as appropriate. Notify embankment or abutments. or movements / cracking. downstream residents at risk by 2. Inspect (three hourly) and photograph (time 3. Travel to the dam as a matter of urgency. telephone / SMS. Evacuate stamped) the embankment, spillway and Estimate the seepage OR cracking, downstream residents if time allows. surrounds for any springs, deformations, bulging, or displacement of the o The Director Dam Safety. movement and cracks. Monitor if those are embankment or abutments and if there is o The CEO increasing. an adverse change in conditions, 2. Initiate an escalation to STAND UP if 3. Photograph (time stamped) of the dam wall, immediately report the increase to the seepage or movement / cracking is spillway and area downstream of the spillway LDC and DIS and advise to escalate to increased and new areas of seepage, and surrounds if damage is observed at STAND UP cracking, bulging, or displacement are regular intervals. 4. Advise the LDC that the priority list of observed or structural changes are 4. Monitor the situation by estimating the rate of critical PAR (Appendix I) should be reported seepage flow, observing the clarity of contacted with an initial advice message. 3. Advise the LDC to advise QPS to seepage OR amount of movement / cracking. 5. Liaise with SDRC Communications commence evacuation of PAR 5. Provide information and assist the DM/DE in Officer to issue media releases. Ensure 4. Maintain contact hourly with DM/DE until monitoring the seepage and other areas of internal staff also know notifications have the end of the event or until rectified dam safety concern at the dam. been commenced. 5. Arrange for any additional steps to be 6. If dam wall failure occurs, immediately report 6. Advise the DIS the possibility of dam taken to mitigate the effects of the to the DM/DE. failure and need of downstream damage. The Director Dam Safety may 7. Record the rainfall (if any) at 30 minute evacuation. choose to direct emergency activities intervals (Appendix B4) and record the

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Dam Supervisor / Dam Operator / Operator Dam Manager / Dam Engineer (DM/DE) Director Infrastructure Services (DIS) CEO Assistants (DS/DO/OA)

reservoir level at 30 minute intervals 7. If necessary, obtain specialist technical based on the extent and type of the (Appendix B3). advice from one of the nominated dam damage. 8. Submit all sheets and photographs to the safety consultants. 6. Record data and information and maintain DM/DE every three hours. 8. If possible, carry out emergency repairs to log of all communications (Appendix B1 & 9. Record data and information and maintain log prevent the rate of seepage to cause the B2). of all communications (Appendix B1 & B2). failure of the dam. Arrange for construction details to be recorded. NOTE: Two Dam Safety Surveillance Trained 9. Obtain prognoses of weather conditions personnel to be present for any on-site activities from BOM to determine the likelihood of from LEAN-FORWARD onwards bad weather preventing or hampering repairs. 10. Record data and information and maintain log of all communications (Appendix B1 & B2). STAND UP 1. Mobilise to Connolly Dam, and remain on site 1. Advise the LDC that the priority list of  Review all event logs, records and reports  Reply to public / media for the duration of the event (two Dam Safety critical PAR (Appendix I) should be from the DM/DE and forward copies to the requests for event Surveillance Trained personnel to be in contacted with an evacuation message – CEO. information attendance) Warning 1  Inform the Director Dam Safety of the 2. IF SAFE, inspect (every 15 minutes) and 2. Update SDRC Communications Officers situation. photograph (time stamped) of the dam and that evacuation messages have been  Keep in constant contact with the other spillway looking for signs of damage or any issued. member organisations of the LDMG and areas of damage. 3. Advise LDC to complete and submit ensure all are aware that that the dam is 3. If dam wall failure occurs or any new damage Emergency Alert Request Form to QFES at RISK OF FAILURE is apparent or seepage rate changes or (Appendix C1) – Warning 1  Record data and information and maintain cracking, bulging, or displacement changes 4. Monitor water levels in the dam log of all communications (Appendix B1 & immediately report to the DM/DE. continuously B2). 4. Record the reservoir level at 30 minute 5. IF SAFE, travel to the dam as a matter of intervals (Appendix B3) and record the rainfall urgency (if any) at 30 minute intervals (Appendix B4).

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Dam Supervisor / Dam Operator / Operator Dam Manager / Dam Engineer (DM/DE) Director Infrastructure Services (DIS) CEO Assistants (DS/DO/OA)

5. Submit all sheets and photographs to the 6. IF SAFE, remain on site and make DM/DE every hour continuous inspections of the dam and 6. Record data and information and maintain log spillway looking for signs of damage such of all communications (Appendix B1 & B2). as deformation, structural movement or cracking, erosion, springs, slumping. If necessary, obtain specialist technical advice from one of the nominated dam safety consultants. 7. IF DAM IS AT RISK OF FAILURE, advise the LDC that the priority list of critical PAR (Appendix I) should be contacted with an evacuation message – Warning 2 8. IF DAM IS AT RISK OF FAILURE, advise LDC to complete and submit Emergency Alert Request Form to QFES (Appendix C1) – Warning 2 9. If possible, carry out emergency repairs to prevent the rate of seepage to cause the failure of the dam. Arrange for construction details to be recorded 10. Record data and information and maintain log of all communications (Appendix B1 & B2). 11. Provide status reports and records for the LDC to review for each 100 mm change in water level or at hourly intervals. 12. Obtain rainfall forecast from BOM and track progress and effects of rain

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Dam Supervisor / Dam Operator / Operator Dam Manager / Dam Engineer (DM/DE) Director Infrastructure Services (DIS) CEO Assistants (DS/DO/OA)

STAND 1. Return to routine activities and inspections After the event: 1. Initiate de-escalation to STAND DOWN 1. Reply to public / media DOWN  Review and edit EER and submit the as the situation is resolved and the dam requests for event After the event: report to the DIS for review has been inspected and assessed by information  Transfer daily events and actions to the dam  Undertake a dam safety inspection, and nominated dam safety consultants log book submit the report to the DIS for review –  If event reached STAND UP, compile an EER SDRC may engage one of nominated After the event: (Appendix B5) and forward unedited copies to dam safety consultants to do this  Review EER and submit to CEO and the the DM/DE  If dam failure has occurred, make all Director Dam Safety. records of the event available for future  Submit report to SDRC where damage to investigations the dam or potential dam safety issues has occurred  If required, arrange for an investigation

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5. Emergency Conditions – Flooding

5.1 Overview

The emergency action described in this section relates to:

 An emergency condition where natural catchment inflows fill Connolly Dam to FSL and the spillway will then discharge water downstream into Rosenthal Creek. These flood flows can create a downstream release hazard. Inflows will also cause the storage to temporarily rise to above the full supply level of the storage. Note:

o The greater the rate of inflow, the higher the storage will rise.

o The higher the storage level rises, the greater the loads on the dam structure. o Although unlikely, the greater the loading on the structure, the higher the likelihood of a dam failure.

Typically, the level of surveillance is increased during flood operations

 Spillway discharge from the dam where there have been no indications that a dam failure may be initiating or in progress.

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

 For small flows, the water will be contained generally within Rosenthal Creek and will not create a downstream release hazard.

 As the rate of discharge increases, there will be an impact on low-level road crossings of Rosenthal Creek, other infrastructure in and adjacent to the river and residential / commercial / industrial property.

 If dam failure does occur with concurrent flooding, then the maximum possible affected area is the level shown by the PMF line on the maps in Appendix G.

5.2 Activation triggers

Dam Levels Predictive Rainfall Indicators Alert Storage at or near FSL (RL 537.64) Rainfall over all of catchment AND Forecast rainfall to continue Expected to rise to <1.0 m Lean Forward Reservoir Level > 1.0 m above FSL Rainfall continuing (RL 538.64) AND Expected to reach DCL. Stand Up 1 Reservoir Level at Dam Safe Level Rainfall continuing (RL 540.58) AND Water level > 2.9 m above FSL. 1:2000 AEP flood.

NOTE – Dam Safe Level is 0.9 m lower than the DCL, i.e. allows 0.9 m freeboard. NOTE – The dam structure is under significant loading and if overtopped will be at risk of failure. Stand Up 2 Storage Level at 1 m above the Dam Rainfall continuing Safe Level (RL 541.58)

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Dam Levels Predictive Rainfall Indicators AND Depth of water over spillway > 3.8 m and overtopping the dam crest by 0.1 m

NOTE – The dam structure is under significant loading and when overtopped will be at near certain failure condition Stand Down Storage level is at or below 1.0 m No rain in previous 24 hours above FSL (RL 538.64) AND AND No significant rainfall predicted Level falling

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5.3 Actions - Flooding

Dam Supervisor / Dam Operator / Operator Dam Manager / Dam Engineer (DM/DE) Director Infrastructure Services (DIS) CEO Assistants (DS/DO/OA)

ALERT 1. Ensure all items listed on checklist (Appendix 1. Review all event logs, records and reports 1. Initiate an escalation to LEAN FORWARD 1. Reply to public / media H) are stowed in vehicle from the DS/DO/OA when triggers are reached (see Section requests for event 2. Monitor reservoir water levels 2. Inform the LDC of seepage and flood 5.2) information 3. Record the rainfall at 60 minute intervals status after receiving confirmation from 2. Review all event logs, records and reports (Appendix B4) and record the reservoir level at DS/DO/OA from the DM/DE 60 minute intervals (Appendix B3) 3. Estimate the likelihood of dam failure, dam 3. Keep the CEO informed 4. Record and photograph (time stamped) any erosion, or cracking and advise the LDC. 4. Record data and information and maintain signs of seepage downstream of the dam, or 4. Inform the LDC of any embankment log of all communications (Appendix B1 & any embankment erosion due to waves, cracks erosion, cracks, movements of dam or any B2) near the dam or dam wall movements visible changes of the embankment or dam 5. Submit all sheets to the DM/DE daily or at structure. every 250 mm rise in the water level 5. Provide status report and daily records for 6. Record data and information and maintain log the DIS to review of all communications (Appendix B1 & B2) 6. Record data and information and maintain log of all communications (Appendix B1 & B2) LEAN 1. Monitor reservoir water levels every hour. 1. Deploy second DO/OA to site 1. Initiate an escalation to STAND UP 1 when 1. Reply to public / media FORWARD 2. Record the rainfall at 30 minute intervals 2. Advise the LDC that the list of critical PAR triggers are reached (see Section 5.2) or if requests for event (Appendix B4) and record the reservoir level at (Appendix I) should be contacted with the seepage, embankment damage, erosions information 30 minute intervals (Appendix B3). initial advice message or structural changes are reported 3. IF SAFE make twice daily (am and pm) 3. Liaise with SDRC Communications Officer 2. Review all event logs, records and reports inspections and photograph (time stamped) of to issue media releases. Ensure internal from the DM/DE. the dam and spillway looking for signs of staff also know notifications have been 3. Keep CEO Informed damage, deformations, cracks closer to either commenced 4. Advise the LDC to advise QPS of the side of the dam abutment and monitor if those 4. Provide status reports and records to the potential for evacuations if the STAND UP are increasing. LDC to review for each 500 mm rise in activation level is invoked

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Dam Supervisor / Dam Operator / Operator Dam Manager / Dam Engineer (DM/DE) Director Infrastructure Services (DIS) CEO Assistants (DS/DO/OA)

4. Submit sheets to the DM/DE for every 250 mm water level or at least twice daily (8am and 5. Inform the LDC of flood status and critical rise in the water level or at least every six 2pm). events as they occur. hours. 5. Estimate whether seepage is increasing 6. Inform the Director Dam Safety of the 5. Record data and information and maintain log and evaluate the potential dam failure due situation. of all communications (Appendix B1 & B2). to dam erosion, crack expansion or any 7. Record data and information and maintain monolithic damage log of all communications (Appendix B1 & NOTE: Two Dam Safety Surveillance Trained 6. Inform the LDC of flood status and of any B2). personnel to be present for any on-site activities increase in seepage or any embankment from LEAN-FORWARD onwards erosion, cracks movements, visible changes of the dam structure. 7. Obtain rainfall forecast from BOM and track progress and effects of flood and inform the DS/DO/OA of the flood forecast. 8. Record data and information and maintain log of all communications (Appendix B1 & B2). STAND UP 1. IF SAFE, mobilise to Connolly Dam, using 1. Advise the LDC, SES, emergency 1. Initiate an escalation to STAND UP 2 when 1. Reply to public / media 1 preferred route (Section 2.2) and remain on personnel and media / communications triggers are reached (see Section 5.2) or if requests for event site for the duration of the event. personnel that the priority list of critical seepage, groin, embankment damage, information 2. IF SAFE make hourly inspections of the dam PAR (Appendix I) should be contacted with erosions or and structural changes are and spillway looking for signs of damage. an evacuation message – Warning 1 reported Photograph (time stamped) the embankment, 2. Advise LDC to complete and submit 2. Review all event logs, records and reports spillway and area downstream of the spillway. Emergency Alert Request Form to QFES from the DM/DE and forward copies to the Notify the DM/DE immediately if any signs of (Appendix C1) – Warning 1 CEO. damage are apparent 3. Monitor water levels in the dam 3. Inform the Director Dam Safety of the 3. Monitor dam water levels every hour. continuously. situation. 4. Record the rainfall at 30 minute intervals 4. Monitor photographs of embankments, 4. Keep in constant contact with the other (Appendix B4) and record the reservoir level at seepage, groins, dam deformations, member organisations of the LDMG and 30 minute intervals (Appendix B3). erosions, cracks of embankments, sliding

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Dam Supervisor / Dam Operator / Operator Dam Manager / Dam Engineer (DM/DE) Director Infrastructure Services (DIS) CEO Assistants (DS/DO/OA)

5. Submit all sheets to the DM/DE for every 250 of walls and immediately advise the LDC ensure all are aware that THAT THE DAM mm rise in water level or at least every hour. of any changes IS LIKELY TO FAIL. Data may be relayed over the telephone. 5. IF SAFE make twice daily (am and pm) 6. IF SAFE monitor water levels in Rosenthal inspections of the dam and spillway looking Creek downstream of the dam e.g. where for signs of damage such as deformation, Connolly Dam Rd crosses the creek structural movement, erosion, springs, 7. Record data and information and maintain log cracking, slumping or any embankment or of all communications (Appendix B1 & B2). dam structural changes. 6. IF DAM IS AT RISK OF FAILURE, advise the LDC, SES, emergency personnel and media / communications personnel that the priority list of critical PAR (Appendix I) should be contacted with an evacuation message – Warning 2 7. IF DAM IS AT RISK OF FAILURE, advise LDC to complete and submit Emergency Alert Request Form to QFES (Appendix C1) – Warning 2 8. Provide status reports and records for the LDC to review for each 250 mm rise in water level or at 30 minute intervals. 9. Obtain rainfall forecast from BOM and track progress and effects of flood and inform the DS/DO/OA of the flood forecast 10. Record data and information and maintain log of all communications (Appendix B1 & B2).

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Dam Supervisor / Dam Operator / Operator Dam Manager / Dam Engineer (DM/DE) Director Infrastructure Services (DIS) CEO Assistants (DS/DO/OA)

STAND UP 1. Monitor dam water levels every 30 minute 1. IF SAFE should travel to the dam as a 1. Review all event logs, records and reports 1. Reply to public / media 2 2. IF SAFE monitor water levels in Rosenthal matter of urgency. from the DM/DE and forward copies to the requests for event Creek downstream of the dam 2. Monitor water levels in the dam CEO. information 3. Record the rainfall at 15 minute intervals continuously. 2. Inform the Director Dam Safety of the (Appendix B4) and record the reservoir level at 3. IF SAFE, photograph any damage to the situation. 15 minute intervals (Appendix B3). dam embankment, spillway, area 3. Keep in constant contact with the other 4. Submit all sheets to the DM/DE every 30 downstream of the spillway and areas member organisations of the LDMG and minute or at every 250 mm rise in water level. upstream and downstream of the dam ensure all are aware that that the dam is at Data may be relayed over the telephone. 4. IF SAFE, remain on site and make RISK OF FAILURE 5. IF SAFE make hourly inspections of the dam continuous inspections of the dam and and spillway looking for signs of damage. spillway looking for signs of damage such Photograph (time stamped) the embankment, as deformation, structural movement, spillway and area downstream of the spillway. erosion, springs, cracking, slumping Notify the DM/DE immediately if any signs of 5. IF DAM IS AT RISK OF FAILURE, advise damage are apparent the LDC, SES, emergency personnel and 6. Record data and information and maintain log media / communications personnel that the of all communications (Appendix B1 & B2). priority list of critical PAR (Appendix I) should be contacted with an evacuation message – Warning 2 6. IF DAM IS AT RISK OF FAILURE, advise LDC to complete and submit Emergency Alert Request Form to QFES (Appendix C1) – Warning 2 7. Provide status reports and records for the LDC to review for each 50 mm rise in water level or at 30 minute intervals. 8. Obtain rainfall forecast from BOM and track progress and effects of flood and inform the DS/DO/OA of the flood forecast

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Dam Supervisor / Dam Operator / Operator Dam Manager / Dam Engineer (DM/DE) Director Infrastructure Services (DIS) CEO Assistants (DS/DO/OA)

9. Record data and information and maintain log of all communications (Appendix B1 & B2). STAND 1. Return to routine activities and inspections After the event: 1. Initiate de- escalation down through to 1. Reply to public / media DOWN  Review and edit EER and submit the report ALERT and STAND DOWN as the requests for event After the event: to the DIS for review situation is resolved and the triggers in information  Transfer daily events and actions to the dam  After the event undertake a dam safety reverse order are met (see Section 5.2) log book inspection, and submit the report to the DIS  Compile an EER (Appendix B5) and forward for review – SDRC may engage one of After the event: unedited copies to the DM/DE nominated dam safety consultants to do  Submit report to SDRC where damage to this the dam or potential dam safety issues has occurred  Review the EER and submit to CEO and to the Director Dam Safety.

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6. Emergency Conditions – 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 dam embankment, foundations, or dam abutment. Damage could take the form of cracking or slumping of the embankment, concrete structure movement, deformation or land slip, 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.

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 affected area is the level shown by the SDF line on the maps in Appendix E.

6.2 Activation triggers

Refer to the “Section 4 – Emergency Condition - Sunny Day Failure”, if any damage to the dam or associated structures has been noted.

Earthquake Indicators Alert Any report of seismic activity Lean Forward - Stand Up - Stand Down Risk assessment has determined that failure risk has reduced.

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6.3 Actions - Earthquake

Dam Supervisor / Dam Operator / Operator Dam Manager / Dam Engineer (DM/DE) Director Infrastructure Services (DIS) CEO Assistants (DS/DO/OA)

ALERT 1. Ensure all items listed on checklist (Appendix 1. Respond to any information of an 1. If reports from the DM/DE confirm that 1. Reply to public / media H) are stowed in vehicle earthquake in the area from the DS/DO/OA significant damage has occurred or an requests for event 2. Following any report of seismic activity inform or local residents and inform the LDC & emergency situation is developing, information the DM/DE DIS that an earthquake was felt in the area. immediately follow the SDF procedure 3. Immediately inspect the dam wall, outlet pipe, 2. Immediately perform a dam safety procedures as presented in “Section 4 – spillway, intake tower and pipeline for springs, inspection to confirm any damage identified Emergency Conditions – Sunny Day deformation, slumps, sinkholes, cracking, by DS/DO/OA. During the inspection, note FailureError! Reference source not erosion, concrete damage, etc. especially near signs of erosion, springs, cracks, high found.”. the spillway and the pipe outlets. seepage flows or any deformations. 2. Immediately inform: 4. On detection of springs, seepage or damage, 3. Review seepage records and where data o The LDC - Road and Rail lines shall be inform the DM/DE of the number, size and indicates a sudden increase in seepage signed for possible closure or closed as location. Photograph (time stamped) and request the DS/DO/OA to inspect the dam appropriate. Particular attention should monitor development IF SAFE. and structures for signs of damage be paid to the Creek parkway footpaths 5. Record data and information and maintain log 4. If a new area of seepage or movement / and pedestrian bridges. of all communications (Appendix B1 & B2). cracking of the structure is identified, carry o The Director Dam Safety out emergency repairs to prevent further o The CEO adverse conditions developing which may 3. Record data and information and maintain result in the failure of the dam. Arrange for log of all communications (Appendix B1 & construction details to be recorded. B2). 5. On detection of leakage, springs, movement , cracking or other adverse conditions which may affect the integrity of the structure proceed with the emergency actions for SDF in Section 4.3 6. Record data and information and maintain log of all communications (Appendix B1 & B2).

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Dam Supervisor / Dam Operator / Operator Dam Manager / Dam Engineer (DM/DE) Director Infrastructure Services (DIS) CEO Assistants (DS/DO/OA)

LEAN  Refer to Section 4.3  Refer to Section 4.3  Refer to Section 4.3  Refer to Section 4.3 FORWARD STAND UP  Refer to Section 4.3  Refer to Section 4.3  Refer to Section 4.3  Refer to Section 4.3 STAND 1. Return to routine activities and inspections After the event, 1. Initiate de-escalation to STAND DOWN as 1. Reply to public / media DOWN  Review and edit EER and submit the report the situation is resolved and the dam has requests for event After the event: to the DIS for review. been inspected and assessed by Dam information  Transfer daily events and actions to the dam  Undertake a dam safety inspection if Safety Consultant log book required, and submit the report to the DIS  If event has reached STAND UP, compile an for review – SDRC may engage one of After the event: EER (Appendix B5) and forward unedited nominated dam safety consultants to do  Review EER and submit to CEO and the copies to the DM/DE this Director Dam Safety.  Submit damage report to the DIS for action  Submit report to SDRC where damage to  If dam failure has occurred, make all the dam or potential dam safety issues has records of the event available for future occurred investigation  If required, arrange for an investigation

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7. Emergency Conditions – Terrorism 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 meteorite.

The vulnerability of Connolly Dam to a terrorist attack is low. 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 area affected is the level shown by the SDF line on the maps in Appendix E.

7.2 Activation triggers

Refer to the “Section 4 – Emergency Condition - Sunny Day Failure”, if any damage to the dam or associated structures has been noted.

Terrorism Indicators Alert Any report of terrorism activity or a high energy impact at the site Lean Forward - Stand Up - Stand Down Risk assessment has determined that failure risk has reduced.

Refer to the Emergency Condition - Sunny Day Failure, if any damage has been noted.

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7.3 Actions – Terrorism

Dam Supervisor / Dam Operator / Operator Dam Manager / Dam Engineer (DM/DE) Director Infrastructure Services (DIS) CEO Assistants (DS/DO/OA)

ALERT 1. Following any report of terrorist activity or a 1. In the event of suspected terrorist activity, 1. If reports from the DM/DE confirm that 1. Reply to public / media high energy impact at the site inform the notify the National Security Hotline or 000 / significant damage has occurred or an requests for event DM/DE 112 emergency situation is developing, information 2. Immediately inspect the dam (if safe) and 2. If Police appoint an Incident Manager, immediately follow the SDF procedures as ensure all security measures are in place support and follow their instructions presented in “Section 4 –Emergency (locked gates etc.). 3. Immediately perform a dam safety Conditions – Sunny Day Failure”. 3. Photograph / video any damage from a safe inspection to confirm damage identified by 2. Immediately inform location (time stamped). DS/DO/OA. If necessary, obtain specialist o The LDC - Road and Rail lines shall be 4. Record data and information and maintain log technical advice from one of the nominated signed for possible closure or closed as of all communications (Appendix B1 & B2). dam safety consultants appropriate. Particular attention should 4. Record data and information and maintain be paid to the Creek parkway footpaths log of all communications (Appendix B1 & and pedestrian bridges. B2). o The Director Dam Safety. o The CEO 3. Record data and information and maintain log of all communications (Appendix B1 & B2). LEAN  Refer to Section 4.3  Refer to Section 4.3  Refer to Section 4.3  Refer to Section 4.3 FORWARD STAND UP  Refer to Section 4.3  Refer to Section 4.3  Refer to Section 4.3  Refer to Section 4.3 STAND 1. Return to routine activities and inspections After the event: 1. Initiate de-escalation to STAND DOWN as 1. Reply to public / media DOWN  Review and edit EER and submit the report the situation is resolved and the dam has requests for event After the event: to the DIS for review been inspected and assessed by Dam information  Transfer daily events and actions to the dam  Undertake a dam safety inspection if Safety Consultant log book required, and submit the report to the DIS  Compile an EER (Appendix B5) and forward for review – SDRC may engage one of After the event: unedited copies to the DM/DE

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Dam Supervisor / Dam Operator / Operator Dam Manager / Dam Engineer (DM/DE) Director Infrastructure Services (DIS) CEO Assistants (DS/DO/OA)

nominated dam safety consultants to do  Review EER and submit to CEO and the this Director Dam Safety.  Submit damage report to the DIS for action  Submit report to SDRC where damage to  If dam failure has occurred, make all the dam or potential dam safety issues records of the event available for future have occurred investigation  If required, arrange for an investigation

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8. Emergency Conditions – Toxic Spills

8.1 Overview

The emergency action described in this section relates to:

 the presence of substantial volumes of chemicals or other potentially toxic contaminants can create a downstream release hazard

 the emergency condition can occur due to a traffic or industrial accident, a flood event transporting chemical drums into the storage, or an activity on or near the storage

 the emergency condition can impact urban, domestic, or stock users of water either within or downstream of the storage, or on recreational users

 During periods of dry weather (no discharges from Connolly Dam), any contamination will be fully contained within the dam.

 the maximum area affected by any spill will depend on whether the river is in flood and / or the spillway is discharging. The possible area of any spill would be the PMF map as an upper limit.

8.2 Activation triggers

Terrorism Indicators Alert Any report of contamination or potential contamination in the catchment area of the storage Lean Forward - Stand Up Confirmation of or highly likely probability of a large amount of chemical spill / toxic conditions found in the storage / catchment Stand Down Risk assessment has determined that failure risk has reduced. Confirmation that significant contamination has not occurred All clear Water Quality test result

No structural damage is expected from this emergency condition.

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8.3 Actions – Toxic Spills

Dam Supervisor / Dam Operator / Operator Dam Manager / Dam Engineer (DM/DE) Director Infrastructure Services (DIS) CEO Assistants (DS/DO/OA)

ALERT Following any report of toxic spills DS/DO/OA 1. Where confirmed by DS/DO/OA, inform 1. Monitor situation and assess risks 1. Reply to public / media shall: DIS and Environmental Health Officer that 2. Assess situation and determine need to requests for event 1. Inform the DM/DE a toxic spill has occurred. move to STAND UP information 2. Undertake investigations to ascertain the 2. Monitor situation and assess risks veracity and details of any reports 3. IF SAFE, photograph / video any evidence of the spill (time stamped). Ensure that a risk assessment has been completed. 4. Record data and information and maintain log of all communications (Appendix B1 & B2). STAND 1. Update warning signage, if relevant 1. Monitor situation and assess risks 1. If reports from the DM/DE confirm that an 1. Reply to public / media UP 2. Collect water samples, if directed 2. Coordinate with the DIS and the emergency situation is developing, requests for event 3. Close all outlet works, if directed Environmental Health Officer to determine immediately inform: information 4. Record data and information and maintain log need for Water Quality testing and o The LDC. of all communications (Appendix B1 & B2). precautionary closure of outlet works o The Director Dam Safety. 3. Record data and information and maintain o The CEO log of all communications (Appendix B1 & 2. Assess risks and determine actions B2). including need for Water Quality testing, and precautionary closure of outlet works 3. Advise Water Treatment Plant of issues 4. Record data and information and maintain log of all communications (Appendix B1 & B2). STAND 1. Return to routine activities and inspections After the event: 1. Initiate de-escalation to STAND DOWN as 1. Reply to public / media DOWN  Review and edit EER and submit the report the situation is resolved and water testing requests for event After the event: to the DIS for review is all clear. information

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Dam Supervisor / Dam Operator / Operator Dam Manager / Dam Engineer (DM/DE) Director Infrastructure Services (DIS) CEO Assistants (DS/DO/OA)

 Transfer daily events and actions to the dam After the event: log book  Review EER and submit to CEO and the  If event reached STAND UP, compile an EER Director Dam Safety. (Appendix B5) and forward unedited copies to  If required, arrange for an investigation the DM/DE

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Appendices

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Appendix A – Technical Information

Appendix A1 – Spillway Capacity Curve Appendix A2 – Storage Capacity Curve

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Appendix A1 – Spillway Capacity Curve

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Appendix A2 – Storage Capacity Curve

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Appendix B – Record Sheets

Appendix B1 – Event Log Sheet Appendix B2 – Record of Communication Sheet

Appendix B3 – Reservoir Level Graph Sheet

Appendix B4 – Flood Rainfall Record Sheet Appendix B5 – EER template

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Appendix B1 – Event Log Sheet

Date Time Event Description / Action Carried Out Record Entered By

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Appendix B2 – Record of Communication Sheet

Date Time Phone Contact Message sent / received Call Sent / person Received By

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Appendix B3 – Reservoir Level Graph Sheet

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Appendix B4 – Flood Rainfall Record Sheet

Record of Rainfall during a flood commencing ……./……./……..

Date Time Rainfall Daily Comments (mm) Total

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Appendix B5 – EER template

EVENT REPORT

NATURE OF THE EVENT

Describe the event (e.g. spillway discharge, earthquake, chemical spill, etc.)

Commencing Time……..….Date……/……../……..

Finishing Time………....Date……./………/……...

DESCRIPTION OF THE EVENT

Describe in your own words the lead up to and progress of the event (e.g. a spillway discharge)

Include such information as listed below:

 Weather conditions and rainfall in the catchment

 The rate of rise of the storage

 When the spillway was overtopped

 Date and time of highest level

 Briefly describe any immediate downstream damage caused by the discharge

 Include any other information considered relevant

STATISTICS

 Total inflow ………………………………………ML

 Total discharge ………………………………....ML

 Capacity of storage prior to inflow……………..%

 Volume prior to inflow…………………………..ML

 Maximum inflow…………………………………ML per day

 Maximum discharge………………………...….ML per day

EVENT PROGRESS

Briefly describe the daily rate of storage rise, time to peak level, and weather conditions.

Attach copies of the Spillway Level Versus Time Graph, the Communications Record Sheet, and the Log of Events / Actions Sheet (Appendix B)

GENERAL COMMENTS

Include in this section any observations or comments regarding the event, such as equipment malfunctions, safety issues or any suggestions which may improve monitoring and reporting of the event

DAMAGE REPORT

Detail any tailwater damage to the embankment or stream bank in the immediate area of the dam. Attach photos

ATTACHMENTS

 Photos / video of the event

 Spillway Level versus Time Graph

 Communications Record Sheet

 Log of Events / Action Sheet

Signed…………………………………Designation……………………………...Date………./…..…/…..…

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Appendix C – Emergency Alert Information

Appendix C1 – Emergency Alert Request Form Appendix C2 – Emergency Alert Polygons

Rosenthal Creek

Warwick Town Appendix C3 – Emergency Messages

Flood Failure message for Priority PAR

Flood Failure message for PAR Sunny Day Failure message for Priority PAR

Sunny Day Failure message for PAR

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Appendix C1 – Emergency Alert Request Form

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Appendix C2 – Emergency Alert Polygons

Flood_SDRC_RosenthallCk

AllHazards_SDRC_WarwickTown

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Appendix C3 – Emergency Messages

Table 1 – Dam Crest Flood Failure Emergency Message Priority PAR

Flood Trigger Severity Polygon Voice Message Text Message Scenario Dam LEAN Watch and Nil (This message will This is a Flood Watch and Act from the Southern Downs Flood Watch & Act message from Crest FORWARD Act be sent by SDRC Regional Council. Connolly Dam is full and likely to Council for Connolly Dam to Connolly Flood directly to subscribed overflow. Properties between Connolly Dam and Connolly Dam Road Bridge - possible threat to Failure priority PAR) Dam Road Bridge are likely to experience rapidly rising life/property-Warn others/prepare to water levels and possible property inundation over the next leave NOW-Listen to radio X hours. You should warn neighbours, secure your belongings and prepare to evacuate your home at short notice. For more information listen to local radio. For flood assistance contact Council on 1 300 6 9 7 3 7 2. STAND UP 1 Warning Nil (This message will Emergency Emergency. This is a Flood Warning from the Flood Warning from Council for be sent by SDRC Southern Downs Regional Council. Connolly Dam is at risk Connolly Dam to Connolly Dam Road directly to subscribed of failure. Flood waters will affect homes south of the Bridge - possible threat to life/property- priority PAR) Connolly Dam Road Bridge at Silverwood within one hour. Evacuate to XXX NOW-Listen to radio You should evacuate to XXXX now. For more information listen to local radio. For flood assistance contact Council on 1 300 6 9 7 3 7 2. STAND UP 2 Warning Nil (This message will Emergency Emergency. This is a Flood Warning from the Flood Warning from Council for be sent by SDRC Southern Downs Regional Council. Connolly Dam is highly Connolly Dam to Connolly Dam Road directly to subscribed likely to fail. Flood waters up to 5 metres deep can impact Bridge - urgent threat to life/property priority PAR) homes south of Connolly Dam Road Bridge at Silverwood within one hour-Evacuate to XXX within one hour. You should evacuate to XXXX NOW-Listen to radio immediately. For more information listen to local radio. For flood assistance contact Council on 1 300 6 9 7 3 7 2.

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Table 2 - Dam Crest Flood Failure Emergency Message for PAR

Flood Trigger Severity Polygon Voice Message Text Message Scenario Dam LEAN Watch Flood_SDRC_RosenthallCk This is a Flood Watch and Act from the Southern Downs Flood Watch & Act message Crest FORWARD and Act Regional Council. Connolly Dam is full and likely to from Council for Connolly Dam Flood overflow. Properties between Connolly Dam and XXX are to XXX - possible threat to Failure likely to experience rapidly rising water levels and life/property-Warn AllHazards_SDRC_WarwickTown possible property inundation over the next X hours. You others/prepare to leave NOW- should warn neighbours, secure your belongings and Listen to radio prepare to evacuate your home at short notice. For more information listen to local radio. For flood assistance contact Council on 1 300 6 9 7 3 7 2. STAND UP 1 Warning Flood_SDRC_RosenthallCk Emergency Emergency. This is a Flood Warning from the Flood Warning from Council for Southern Downs Regional Council. Connolly Dam is at Connolly Dam to XXX - possible risk of failure. Flood waters will affect homes from threat to life/property-Evacuate Connolly Dam to XXX within the next X hours. You should to XXX NOW-Listen to radio AllHazards_SDRC_WarwickTown evacuate to XXXX now. For more information listen to local radio. For flood assistance contact Council on 1 300 6 9 7 3 7 2. STAND UP 2 Warning Flood_SDRC_RosenthallCk Emergency Emergency. This is a Flood Warning from the Flood Warning from Council for Southern Downs Regional Council. Connolly Dam is Connolly Dam to XXX - urgent highly likely to fail. Flood waters up to 5 metres deep can threat to life/property within X impact homes from Connolly Dam to XXX within the next hours-Evacuate to XXX NOW- AllHazards_SDRC_WarwickTown X hours. You should evacuate to XXXX immediately. For Listen to radio more information listen to local radio. For flood assistance contact Council on 1 300 6 9 7 3 7 2.

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Table 3 - Sunny Day Failure Emergency Message for Priority PAR

Flood Trigger Severity Polygon Voice Message Text Message Scenario Sunny STAND UP 1 Warning Nil (This message will be Emergency Emergency. This is a Flood Warning from the Flood Warning from Council for Day sent by SDRC directly to Southern Downs Regional Council. Connolly Dam is at risk of Connolly Dam to XXX - possible Failure subscribed priority PAR) failure. Flood waters will affect homes from Connolly Dam to threat to life/property- Evacuate XXX within the next X hours. You should evacuate to XXXX to XXX NOW-Listen to radio now. For more information listen to local radio. For flood assistance contact Council on 1 300 6 9 7 3 7 2. STAND UP 2 Warning Nil (This message will be Emergency Emergency. This is a Flood Warning from the Flood Warning from Council for sent by SDRC directly to Southern Downs Regional Council. Connolly Dam is highly Connolly Dam to XXX - urgent subscribed priority PAR) likely to fail. Flood waters up to 5 metres deep can impact threat to life/property with X homes from Connolly Dam to XXX within the next X hours. You hours-Evacuate to XXX NOW- should evacuate to XXXX immediately. For more information Listen to radio listen to local radio. For flood assistance contact Council on 1 300 6 9 7 3 7 2.

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Table 4 – Sunny Day Failure Emergency Message for PAR

Flood Trigger Severity Polygon Voice Message Text Message Scenario Sunny STAND UP 1 Warning Flood_SDRC_RosenthallCk Emergency Emergency. This is a Flood Warning from the Flood Warning from Council for Day Southern Downs Regional Council. Connolly Dam is at Connolly Dam to Smelter Failure risk of failure. Flood waters will affect homes from Rd/Homestead Rd - possible AllHazards_SDRC_WarwickTown Connolly Dam to Smelter Road and Homestead Road threat to life/property- Evacuate within the next two hours. You should evacuate to XXXX to XXX NOW-Listen to radio now. For more information listen to local radio. For flood assistance contact Council on 1 300 6 9 7 3 7 2. STAND UP 2 Warning Flood_SDRC_RosenthallCk Emergency Emergency. This is a Flood Warning from the Flood Warning from Council for Southern Downs Regional Council. Connolly Dam is Connolly Dam to Smelter highly likely to fail. Flood waters will affect homes from Rd/Homestead Rd - urgent AllHazards_SDRC_WarwickTown Connolly Dam to Smelter Road and Homestead Road threat to life/property within two within the next two hours. You should evacuate to XXXX hours-Evacuate to XXX NOW- immediately. For more information listen to local radio. Listen to radio For flood assistance contact Council on 1 300 6 9 7 3 7 2.

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Appendix D – Mapping Overview

Appendix D1 – Failure Impact Zone - comparison

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Appendix D1 – Failure Impact Zone - comparison

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Appendix E – Sunny Day Failure Inundation Maps

Appendix E1 – SDF Peak Flood Depth Appendix E2 – SDF Peak Flood Depth – Warwick – Maps 1 to 5

Appendix E3 – SDF Travel Times

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Appendix E1 – SDF Peak Flood Depth

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Appendix E2 – SDF Peak Flood Depth – Warwick – Map 1

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Appendix E2 – SDF Peak Flood Depth – Warwick – Map 2

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Appendix E2 – SDF Peak Flood Depth – Warwick – Map 3

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Appendix E2 – SDF Peak Flood Depth – Warwick – Map 4

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Appendix E2 – SDF Peak Flood Depth – Warwick – Map 5

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Appendix E3 – SDF Travel Times

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Appendix F – Dam Crest Flood Failure Inundation Maps

Appendix F1 – DCFF Peak Flood Depth

Appendix F2 – DCFF Travel Times

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Appendix F1 – DCFF Peak Flood Depth

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Appendix F2 – DCFF Travel Times

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Appendix G – Probable Maximum Flood Inundation Maps

Appendix G1 – PMF Peak Flood Depth

Appendix G2 – PMF Peak Flood Depth – Warwick – Maps 1 to 5

Appendix G3 – PMF Travel Times

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Appendix G1 – PMF Peak Flood Depth

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Appendix G2 – PMF Peak Flood Depth – Warwick – Map 1

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Appendix G2 – PMF Peak Flood Depth – Warwick – Map 2

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Appendix G2 – PMF Peak Flood Depth – Warwick – Map 3

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Appendix G2 – PMF Peak Flood Depth – Warwick – Map 4

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Appendix G2 – PMF Peak Flood Depth – Warwick – Map 5

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Appendix G3 – PMF Travel Times

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Appendix H – Checklist for Dam Operators

Item Location / Details

Satellite Phone Location – see Warwick Depot Key to gate to dam Camera Ensure has time and date stamp mode Tablet / smart phone Food and drinking water Enough for 6 hours Emergency Action Plan Water Treatment Plant

Appendix I to K have been redacted

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sdrc.qld.gov.au