Model Construction:Outlet information

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When channel routing is not specified, information about which cell represents the watershed outlet and the slope of the land surface at the outlet must be defined. The outlet location is defined be creating a feature point in the desired cell and setting the type attribute to outlet. WMS will extract the I and J indices of the cell underlying the outlet point and feed that information to GSSHA. The outlet slope must be defined in the Job Control dialog. The bed slope is equal to the tangent of the angle that is made between the bed profile at the outlet and the horizontal plane. This slope is used to calculate the outflow overland discharge at the outlet based on a normal depth boundary condition. When channel routing is specified, the outlet of the catchment is defined by the location of the stream network and an outlet feature point need not be specified.

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Model Construction
Global parameters
Total time
Outlet information
Defining a uniform precipitation event
Describing overland flow
Overland flow routing options
Verifying the basic model
Editing the grid to correct elevation errors
Determining an appropriate time-step
Running GSSHA