6/4/2014. Murweh Shire, Queensland CHARLEVILLE FLOOD MANAGEMENT MOVING BEYOND MITIGATION

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1 Neil Polglase David Murray Murweh Shire, Queensland May 2014 CHARLEVILLE FLOOD MANAGEMENT MOVING BEYOND MITIGATION Emergency Management System Land area of 43,905 km2 Population Murweh Shire 4,910 Town of Charleville 3,278 Town of Augathella Temperatures 15oC to 37oC during the summer months 3oC to 25oC during the winter months Wet season is typically January through April Town of Charleville, Murweh Shire, Queensland Australia The Warrego River Overtopped its Banks in April 1990 and February 1997 with Little Warning In Response to 1990 and the 1997 Flooding, a Levee along Warrego River was Constructed In March 2010 the Town Floods Again via Bradley s Gully Tributary 1

2 Following the 2010 Flood, Queensland Government Funded Two Additional Flood Mitigation Projects In February 2012 Levee Saves Charleville From Second Biggest Flood of Record Construction of a second levee along Bradley s Gully Project for flood and fire response planning Warrego River Bradley s Gully Five Major Floods were Recorded Since 1990 Location Warrego River at Charleville Bradley s Gully at Charleville Event Estimated Peak Flood Mechanism (year) Discharge (m3/s) No Levee Major Warrego River Flooding No Levee Repeat of significant Warrego River Flooding Levee Complete, minor River Flooding Levee Complete Peaked at Crest of Levee, No River Flooding No significant flooding Levee complete, but major flooding from behind levee due to Bradleys Gully Levee holds, minor flooding from Bradleys Gully CDM Smith Worked with the Local Disaster Management Group (LDMG) on Flood Response Emergency Management System CDM Smith was selected to meet with Stakeholders and develop approach to meet their needs First task order included: November 2012 February 2013 Onsite visit to review historical data & meet with stakeholders Collect relevant data from local and state agencies Develop scope of services to meet defined expectations and be compliant with grant funding requirements Second task order included: February 2013 May 2014 Develop stormwater model for pilot area Develop Emergency Management System (EMS) flood tool Develop fire modeling plan Roles and Responsibilities for Disaster Management Local Disaster Management Group (LDMG) Assist in the development of a local disaster management plan Assist with community outreach associated with preparing for an event Identification and coordination of resources for disaster recovery operations District Management Group (DMG) Ensure disaster management operations are consistent with Queensland disaster management policies Develop and review disaster management policies and procedures State Disaster Management Group (SDMG) Develop a strategic policy framework for disaster management Develop and maintain protocols for effective disaster management arrangements between Queensland and the Australian Government Identify resources available within and outside of the State Provide recommendations to the Minister regarding matters related to disaster management operations Prepare and maintain the State Disaster Management Plan 2

3 Selected LDMG Flood Response Components Develop stormwater model covering the 47,000 km 2 Warrego River Catchment Develop Geographic Information System (GIS) based decision support system Leverage predicted and real time rainfall and flood level data ArcMapdocument and geodatabase platform Use LDMG protocols for emergency response Stormwater Model Framework XP-SWMM 2012 XP Rafts commonly used in Australia for flood studies Model resolution 107 subcatchments 242 model links 20 rainfall stations Model calibration & validation 2010, 2012 calibration 1997 validation storm Identified 15 key decision locations Simulation goal < 15 minutes Stormwater Model Calibration Peak Stage Stormwater Model Calibration Peak Flow Station Observed Model Delta (m) Observed Model Delta (m) Augathella Charleville Wyandra Wallen Cunnamulla Raceview Charleville (BG) Binnowee Station Observed Model Delta (%) Observed Model Delta (%) Augathella Charleville Wyandra Wallen Cunnamulla Raceview Charleville (BG) Binnowee Flood Timing is Critical for Decision Making - Stage Flood Timing is Critical for Decision Making - Flow 3

4 Stormwater Model Validation Results 1997 Stage (m AHD) Model Calibration Summary 1997 Flow (cms) Station Observed Model Delta (m) Observed Model Augathella Delta (%) -2.4 Charleville Wyandra Cunnamulla Model calibrated well to measured data at eight locations throughout basin for flow, stage, and time Model verification of 1997 storm event also compared well to measured data As a result, Murweh Shire staffs and the LDMG had confidence in the model in predicting flood timing and extent Flood Response Planning Identified Emergency Response Activities Mission is to make proactive emergency preparedness decisions Leverage rainfall and stage monitors Identify critical decision points for LDMG Early warning systems Time Location Response action Protocols Maximize use of limited resources Emergency Management System (EMS) Tool Sirens, radio, and television Evacuations Land, air, and boat Road closures Sandbag support Police, fire, and rescue assistance Air support supplies Request for additional assistance from state and federal resources Analyze Storm Conditions Link to Weather Stations: Bureau of Meteorology South West NRM Use hyperlink tool for gagespecific readings 4

5 Building a Storm Event Process Storm Data Leverage rainfall predictions from Bureau of Meteorology Define hydrologic conditions Aerial reduction Individual rain gauge EMS tool builds XP- SWMM runoff data set Antecedent moisture condition Storm duration Storm center Storm volume Apply aerial reduction Storm direction and speed The Process Storm Data button will write the results to the gage feature class Export XPX File Modeling the Storm The Export Storm to XPX will write the output file to be read by XP-SWMM Load Rainfall Data Import Model Results Import Model Results Extract the node elevation data from XP-SWMM Import results to geodatabase Generates hydrograph tables Analyzes Critical Locations 5

6 Analyzing the Results Critical Locations Report Using ESRI Report Engine and XP-SWMM Model Results Options for viewing results Generate critical locations report Built-in standard ESRI ArcMap functions Individual critical locations report View hydrograph Actions Dashboard Defined by BOM Viewing Results with Standard ESRI ArcMap Tools Flood Hydrographs Can Be Viewed for the Selected Locations Individual Critical Locations Report The EMS Dashboard Stores Pre-filled Forms Necessary for Approval and Reimbursements Subset of each key location defined for the Warrego River Cachment Decision points defined by LDMG 6

7 Closing Remarks Acknowledgment of Key Team Members Proactive response planning tool when manpower resources are limited Estimated time available to respond to a flood threat Integrated into LDMG annual training held in November 2013 Future discussions Additional decision support management Refinement of aerial reduction methods Integration into the QitPlus Guardian emergency management system used throughout Australia Digital integration of live rainfall data Mr. Neil Polglase Murweh Shire Mr. Allan Pemberton Murweh Shire Mr. Brian Mack CDM Smith Mr. Evan O Brien CDM Smith Australia Mr. Tom Nye, Ph.D, P.E. CDM Smith Mr. Mark Zito, GISP CDM Smith Mr. SeenuAnandam, P.E. CDM Smith Mr. Mike Schmidt. P.E. CDM Smith DISCUSSION AND QUESTIONS 7