Parent Layer: Macquarie Valley FMP 2020 DRAFT

Name: Macquarie_Valley_FMP_Peak_discharge_calculation_locations

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Description: Peak discharge of the August 1990 large design flood (2.9% AEP at the Macquarie River at Narromine gauging station – 421006) under modelled existing development conditions in the Macquarie Valley Floodplain. The locations are the four transects running in a general east west direction across the floodplain. Each location is split into several sections running generally perpendicular to the direction of flow and/or followinga road. The peak discharge (‘Q_value’) occurring in each section of the floodplain is reported as a total flow in cubic metres per second. The total flow typically includes flow within the river, as well as across the floodplain areas adjacent to the river.For flood work applications that require a supporting Flood Study Report, the rural Floodplain Management Plan for the Macquarie Valley Floodplain 2020 typically requires consideration of the changes to peak flood flow distribution at a regional/floodplain scale. This is calculated as the percentage redistribution potentially caused by a proposed flood work. This information is used to ensure any redistribution of peak flood flows at a regional/floodplain scale is within acceptable limits (as specified in cumulative impact assessment criteria in the rural Floodplain Management Plan for the Macquarie Valley Floodplain 2020).

Copyright Text: The Environment, Energy and Science Group (Healthy Floodplains Team) in conjunction with the Water Group within the Department of Planning, Industry and Environment.

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Fields:

• OBJECTID ( type: esriFieldTypeOID, alias: OBJECTID )
• Location ( type: esriFieldTypeString, alias: Location, length: 50 )
• Floodplain_model ( type: esriFieldTypeString, alias: Floodplain_model, length: 50 )
• Section_reference ( type: esriFieldTypeString, alias: Section_reference, length: 5 )
• Q_value ( type: esriFieldTypeDouble, alias: Q_value )
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