WMS:HEC-HMS Diversions

HMS allows flow to be diverted from an outlet or drainage basin. This flow can be thought of as leaving the normal drainage system at that point. It can be retrieved at a downstream outlet where the diverted flow then contributes to the flow at that outlet. If no downstream retrieval outlet point is specified, the flow simply leaves the system at the diverted outlet point and never returns (similar to a sink).

Diversion Data

Diversions are created using a combination of the Add Diversions and Retrieve Diversion commands found in the Tree menu. Once created, data for the diversion can be defined and/or edited by selecting the Edit Parameters option from the HEC-HMS menu.

The following data should be defined for a diversion:

• Name – The name identification string of the diversion as used on the DT record. It is important to assign a unique name to each diversion in a given model because this name is used by WMS and by HEC-1 to identify the diversion.

• Max Volume – Maximum volume of diverted flow in acre-feet (1000 cu m).

• Peak Flow – Peak flow that can be diverted in any computation period in cfs (cms).

• The flow capacity of a stream flow diversion is specified using an inflow and outflow table. This table is defined with the XY Series Editor.

Related Topics

• Editing HMS Properties
• Adding Diversions
• Retrieving Diversions