Charlton Flood and Drainage Management Plan Charlton Town Hall 23 - - PowerPoint PPT Presentation

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Charlton Flood and Drainage Management Plan Charlton Town Hall 23 - - PowerPoint PPT Presentation

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Charlton Flood and Drainage Management Plan Charlton Town Hall 23 August 2011 Community Meeting Principles Reflection on the past to better plan for the future CMA and Shire is seeking to understand Wanting to hear all views allow

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Charlton Flood and Drainage Management Plan

Charlton Town Hall 23 August 2011

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Community Meeting Principles

  • Reflection on the past to better plan for the future
  • CMA and Shire is seeking to understand
  • Wanting to hear all views – allow others to contribute
  • All perspectives are valid
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SLIDE 3

North Central CMA role

  • Emergency management support
  • Incident Control Room support
  • Predictions re flood behavior and impacts
  • Community meetings
  • Short term response
  • Priority Flood mitigation works i.e. debris removal etc
  • Flood pegging and mapping
  • Stream gauge reinstatement
  • Longer term recovery
  • Flood studies, Floodplain Plans etc
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SLIDE 4

Buloke Shire Council role

  • Leads the development and implementation of local

stormwater management plans

  • Manages local urban drainage systems
  • Responsible for incorporating best practice guidelines in

local planning policies

  • Works with communities to ensuring adequate urban

drainage systems are put in place

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SLIDE 5

Overview

  • Charlton Flooding – Historic and Recent
  • Flood and Drainage Management Plan
  • Where to from here and meeting close
  • Community knowledge session
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SLIDE 6

Charlton Flooding – Historic Flooding

  • Charlton has had a history of flooding, incl.1893, 1909,

1939, 1956, 1983, 1992

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SLIDE 7

Charlton Flooding – 1973

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SLIDE 8

Charlton Flooding – 1983

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Recent Charlton Flooding

September 2010

  • Up to 100mm in Western/Central Victoria
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Recent Charlton Flooding

September 2010

  • Up to 100mm in Western/Central Victoria

October, November & December 2010

  • Further rain events wetting catchments
  • Large scale rural inundation

October, November & December 2010

  • 100 – 300mm across two thirds of Victoria
  • Wettest start to a year since records began
  • Record river heights on Avoca, Loddon & Campaspe catchments
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Summary of Rainfall

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Avoca Catchment

  • ~ 3000 square

kilometres upstream of Charlton

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Avoca Gauging Stations

  • 4 flood warning gauging

stations on Avoca River

  • Archdale Junction
  • Coonooer (Yawong Weir)
  • Charlton D/S
  • Quambatook
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SLIDE 19

Charlton Flooding

  • Key issues to investigate (what we have heard so far)
  • Improved Flood warnings
  • Origin of flood flows – Yeungroon Creek/Avoca River
  • Limited capacity of opening through railway line
  • Obstructions to flood flows incl. roads/culverts
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Response to Flooding

  • Flood mapping – pegging of flood extent, surveys

undertaken

  • Immediate works (debris removal)
  • Charlton Flood and Drainage Management Plan

commissioned

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Plan for the Future

  • Charlton Flood and Drainage Management Plan
  • Aim - identify key flooding issues and assess and recommend flood

mitigation and drainage improvement works

  • Steering Committee and Technical Working Group Established to

Guide Plan development

  • Victorian Flood Review and ENRC– Separate process with focus on

flood warning and short term response

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BMT WBM

  • BMT WBM will be undertaking the Charlton Flood and

Drainage Management Plan

  • Michael Turnley Project Director
  • Philip Pedruco Project Manager
  • Michael South Project Engineer
  • We have completed 100’s of flooding and drainage studies

across Victoria, Australia and internationally

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Development of the Plan

  • The Aim of the Plan

– Identify key flooding issues and assess and recommend flood mitigation and drainage improvement works

  • Collect data and information

– From agencies such as BoM and Council – From the community (Local knowledge and observations are essential to the development of the Plan)

  • Create a flood model

– Calibrate the model so we have confidence in the results

  • Test mitigation options in the model
  • Make recommendations
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Collect data and information

  • Data collection

– Topographic data (digital elevation model) – Historical flow data and flood level data – Flood behaviour – Land uses, aerial photography, infrastructure data, flood photos and videos

  • Local information and input

– Learn from local knowledge, e.g. where did water flow, how fast, how high etc – Invaluable information – Benefits » Community involvement » Confidence in modelling and study outcomes

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Create a flood model

  • Whole of catchment

model

– Calculates how much water and the timing of flow

  • Detailed model

– Calculates the extents and flood heights

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Detailed model

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Model calibration

  • Can a mathematical model

really simulate a flood?

  • The software is well proven
  • n hundreds of catchments

both in Australia and

  • verseas
  • IMPORTANTLY we will

verify the model to local conditions

– Model will be calibrated and validated against the recent events

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Test mitigation options in the model

  • We can test options to

manage flooding

– Modify terrain data to include levees, embankments, etc – Modify drainage structures such as bridges and culverts – Run model with changes and compare flood heights to existing case – Adjust design if required

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Outputs of the Plan

  • An improved understanding of flooding in Charlton

– Return periods

  • Flood maps of Charlton

– Flood depths, velocities and levels – Flood hazard

  • Recommendations on mitigation options

– Structural and non-structural

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Timing of the Plan

  • The Plan has commenced

– We are collecting data and information (including tonight) – We have started building model

  • Flood model completed in November / December
  • Public Meeting in December to discuss flood

mitigation options

  • Completion of options investigations February /

March 2012

  • Plan completion by June 2012
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Charlton Flood and Drainage Management Plan

Key Steps

  • Community Engagement (Through out Plan development)
  • Review flood information (Inc local community information)
  • Develop Models – represent flooding events
  • Assess effectiveness and feasibility of mitigation actions
  • Recommend mitigation actions in Plan
  • Seek community feedback on draft Plan & finalise Plan
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Community Feedback

  • Local knowledge and observations important
  • Flood extent & behavior
  • Localised flooding issues
  • Local rainfall information
  • Historic flooding events
  • Local knowledge will provide a better understanding of

flood behavior and lead to more accurate assessment of Mitigation options

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Next Steps

  • Collate community information
  • Develop Flood Models
  • Keep community informed of progress
  • Develop Draft Plan & seek community feedback on Draft
  • Finalise Plan and seek funding to implement
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Feedback Session

  • Documenting local knowledge important
  • Maps of Charlton – mark on flood information

(extent, flood directions, major issues)

  • Questionnaire – Fill in tonight or Drop off to Council Flood

Recovery Office (copies made available for other community members not at meeting)

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Thank you

  • Reminder – to provide contact details so we can keep you

informed of progress

  • Return Questionnaires