WMS:TR-20 Basin Data

General information for each basin is entered by selecting a basin and choosing the Basin Data dialog. If multiple basins are selected, some fields will not be able to be edited (e.g. Basin name and Area), while others will be "grayed out". These other fields are in Multi-select mode. If you select and assign data to these fields, this data is assigned to all the selected sub-basins.

Area

When a TIN, DEM, or Map-based model is present, basin areas and slopes can be computed automatically using the Compute Basin Data command in the TIN or DEM Drainage module menus, or in the Feature Objects Map module menu. If a TIN, DEM, or map data are not present, areas and slopes must be entered interactively using the topological tree as a map. Areas should be entered in square miles.

Curve Number

Curve Number refers to the SCS curve number for rainfall/ losses on snow-free ground.

• NOTE: Composite Curve Numbers can be computed automatically using a land use and hydrologic soil group coverages.

Name

Each hydrograph station should be identified with a unique name. This name is specific to TR-20 files created by WMS, and is used to identify the basin in the file so that resulting hydrographs from a model run can be read back into WMS and associated with the basin. The name can not be more than six characters long. By default WMS uses the basin ID number followed by a "B" for the name, but a descriptive name is generally more useful.

Related Topics

• TR-20 Overview
• Editing TR-20 Parameters
• Time of Concentration
• Defined Cross Section
• Defined Reservoir