WMS:Post Processing

After finishing a stochastic simulation there are two primary results read back into WMS for each simulation: hydrographs from the HEC-1 model, and the floodplain depths and water surface elevations for each run.

Hydrographs

A series of hydrographs are loaded for each hydrograph station and can be viewed in the normal way hydrographs are viewed.

Floodplains

Each floodplain delineation results in a water surface elevation and a flood depth data set. Each pair of data sets are organized in a folder underneath the TIN in the Project Explorer. You can set the contour options for a TIN and select the data set you wish to be active and displayed from the Project Explorer.

Probabilistic Floodplain Boundary

A final data set showing the probability of flooding is also created from all of the individual floodplain data sets. The probabilistic flood plain indicates for each vertex on the TIN the percentage of model runs that resulting in inundation at the point.

Close up view

Annual Exceedance Probability (AEP) Map

When using the stochastic hydrologic/hydraulic/floodplain delineation tools it is possible to generate an annual exceedance probability map. This is done by generating inundation maps that consider the range of all possible floods for all return periods. The result is a map that identifies the annual exceedance probability of flooding for every TIN vertex. For example if a point is flooded 10 times in 1000 simulations then it would represent the .01 probability. The Return Period -> Feature Objects... command allows you to generate contours from the AEP map for specified return periods.

Previous Step in Stochastic Modeling

Related Topics

• Stochastic Modeling
• Displaying Hydrographs
• Return Period to Feature Object
• Plot Windows