Layer: Surface Depression Ponding Areas 2021 (ID: 3)

Name: Surface Depression Ponding Areas 2021

Display Field: SURFACE_AREA

Type: Feature Layer

Geometry Type: esriGeometryPolygon

Description: <DIV STYLE="text-align:Left;"><DIV><DIV>Surface depressions are defined as areas on the DEM that are surrounded by cells of higher elevation and which could therefore potentially fill if their outlets were blocked. The extent to which depressions are formed on the DEM surface therefore depends on the degree to which the DEM has been corrected. To map surface depressions for this project, the supplied OLFP network was analysed to identify areas where surface pooling of water may result in localised flooding. Many surface depressions are either artefacts of the DEM or so shallow as to be of little interest from a flood hazard perspective. In order to refine the depressions dataset to those of potential interest from a management perspective, all cells of less than 50 mm depth were therefore removed, and the remaining areas were required to meet all the following criteria to qualify as a depression:<UL STYLE="margin:0 0 0 0;padding:0 0 0 0;"><LI>Surface area > 100 m2 </LI><LI>Maximum depth > 0.20 m </LI><LI>Volume > 20 m3</LI></UL>Surface depressions matching the above criteria have been converted into polygon features and attributed with the following fields<UL STYLE="margin:0 0 0 0;padding:0 0 0 0;"><LI>SURFACE_ARA: Area (m2) of surface depression</LI><LI>VOLUME: Estimated volume of the surface depression (m3)</LI><LI>MIN_DEPTH: Minimum estimated depression depth within the surface depression</LI><LI>MAX_DEPTH: Maximum estimated depression depth within the surface depression</LI></UL></DIV></DIV></DIV>

Service Item Id: 7a9fc3d738ea4b5a9611e1b7ca8170e8

Copyright Text: Morphum Environmental, July 2021

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Fields:

OBJECTID ( type: esriFieldTypeOID, alias: OBJECTID )
Shape ( type: esriFieldTypeGeometry, alias: SHAPE )
SURFACE_AREA ( type: esriFieldTypeString, alias: Areas of Ponded Surface (m2), length: 200 )
MAX_DEPTH ( type: esriFieldTypeDouble, alias: Max Estimate Depth (m) )
MIN_DEPTH ( type: esriFieldTypeDouble, alias: Min Estimate Depth (m) )
VOLUME ( type: esriFieldTypeString, alias: Volume (m3), length: 200 )
Shape.STLength() ( type: esriFieldTypeDouble, alias: SHAPE_Length )
Shape.STArea() ( type: esriFieldTypeDouble, alias: SHAPE_Area )

Supported Operations: Query Query Attachments Query Analytic Generate Renderer Return Updates

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