WMS:Define Flood Inundation Polygon

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HY8 Modeling Wizard showing the Define Flood Inundation Polygon step.

The Define Flood Inundation Polygon step is used to define a flood inundation polygon if a drainage coverage with a polygon defining the inundation area does not already exist. It's necessary to define a flood inundation polygon for any culvert crossings with no outlets (and no basin polygons) assigned but with a hydrograph. The purpose of this inundation polygon is to compute a storage capacity curve and to define a flood barrier when running the floodplain delineation.

Help

Define flood inundation polygon – This button allows creating arcs that represent the flood inundation boundary. Normally, use the roadway as one of the arcs and build arcs for the rest of the inundation boundary.

Select flood inundation polygon – This button allows selecting arcs that represent the flood inundation boundary.

Delete flood inundation polygon – By selecting this and then clicking on an arc or inside a polygon, the polygon is deleted and all the generic arcs (not the roadway centerline arcs) making up that polygon are deleted from memory.

Build polygons – Selecting this builds all the polygons in the HY-8 coverage and assigns them as flood inundation polygons without prompting to use all the arcs to build polygons.