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When good rivers turn bad: Extreme flooding
Case study - The Johnstone River, Far North Queensland

Objectives and key stages

The key objectives of the study were as follows:

  1. develop a state-of-the-art computer model of the Johnstone Rivers System within the study area to define the nature and extent of the flood hazard;
  2. model the effects of existing developments and existing flood mitigation measures to determine their impact on flooding, including community concerns raised during the resident survey and community open sessions;
  3. propose, assess and recommend possible flood mitigation measures with consideration given to social, ecological and economic factors;
  4. prepare a report detailing the development of the model, the assessment of the effect of existing development and flood mitigation measures, addressing community concerns and detailing proposed flood mitigation measures;
  5. prepare a Floodplain Management Plan.

There were seven key stages in the study.

  1. Data Collection
  2. Flood Model Development and Calibration
  3. Design Flood Analysis and Existing Flood Damage Assessment
  4. Historical Floodplain Works Assessment
  5. Floodplain Management Measures Assessment
  6. Recommendation of Management Measures
  7. Reporting
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1. Origins of extreme weather | 2. Finding hidden treasure | 3. Streams and mass wasting
4. The Johnstone River, FNQ


The resources contained in this unit are courtesy of Earth Science Australia http://earthsci.org/