WMS:GSSHA Storm Drain

The "GSSHA Storm Drain" coverage in WMS is used to hold feature arcs, nodes, and polygons related to subsurface drainage network or agricultural tile drain modeling.

Pipe Junction

The following data required for modeling storm/tile drain systems is entered at pipe junction nodes.

Super Junction Number

The super junction number is computed by WMS by using the GSSHA | Number Storm Drain menu command in the 2D Grid module, but can also be manually edited at any time.

Invert Elevation

Enter the invert elevation in meters of the pipe at this location.

Manhole Area

Enter the manhole area (m²).

Inlet Type

The inlet type is used to account for flow into or out of the pipe network. Select 0-9 grate inlets to specify the amount of flow into the pipe network. Choose Empty to grid cell or Empty to channel to indicate that flow from the pipe network will be routed either back to the grid cell or into the 1D stream network.

Storm/Tile Drain Dialog

The GSSHA Storm/tile drain dialog.

The GSSHA Storm/tile drain dialog is accessible by clicking the Edit parameters... button to the right of Storm/tile drain in the list of other parameters in the GSSHA Job Control Parameters dialog. It has three options:

• Allow GSSHA to redistribute Superlink Vertices – Turn on to allow GSSHA to redistribute superlink vertices.
• Groundwater flow computation method section
  • "Cooke Method (default)" – Uses the Cooke Method for computing groundwater flow.
  • "Drainmod Method" – Uses the DRAINMOD method developed by R.W. Skaggs.