WMS:TR-55 Basin Data: Difference between revisions
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* [[WMS:TR-55 Drainage Area|Drainage Basin Area.]] | * [[WMS:TR-55 Drainage Area|Drainage Basin Area.]] | ||
* [[WMS:TR-55 Time of Concentration|Time of Concentration.]] | * [[WMS:TR-55 Time of Concentration|Time of Concentration.]] | ||
===SCS (NRCS) Curve Number=== | |||
The NRCS (SCS) Curve Number (CN) should be entered in this field. CN is a function of hydrologic soil group and land use. Composite CN values may be computed for each basin and mapped to this field. For more information on [[WMS:Compute GIS Attributes|computing CNs from GIS data layers]]. | |||
===Rainfall=== | ===Rainfall=== | ||
====24-hour rainfall depth and an appropriate time distribution curve==== | ====24-hour rainfall depth and an appropriate time distribution curve==== | ||
Revision as of 16:36, 22 February 2013
The following information must be determined and appropriate values entered for each sub-basin.
SCS (NRCS) Curve Number
The NRCS (SCS) Curve Number (CN) should be entered in this field. CN is a function of hydrologic soil group and land use. Composite CN values may be computed for each basin and mapped to this field. For more information on computing CNs from GIS data layers.
Rainfall
24-hour rainfall depth and an appropriate time distribution curve
Both the total rainfall and a dimensionless mass distribution must be specified to define precipitation for a basin. The total rainfall is entered in the rainfall edit field, and the distribution type is specified by selecting one of the standard NRCS (SCS) rainfall distribution types from the drop down list. The TR-55 reference manual shows a map (Appendix B-2 of the TR-55 reference[1]) of distribution types for the US.
Optionally, the effects of water bodies can be determined by entering the percent of the watershed covered by lakes/ponds.
Related Topics
WMS – Watershed Modeling System | ||
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