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The SCS Rainfall Method was developed by the United States Department of Agriculture - Natural Resources Conservation Service (USDA-NRCS). It generated four synthetic 24-hour rainfall distribution curves that cover all geographical regions of the United States. These curves are described in Appendix B of Technical Release 55.
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| This method may not be available for your region. For more information, refer to the Regionalisation topic. |
Use the controls described below to generate SCS rainfall to be run by the analysis.
Generate SCS Data
This link directs users to the National Weather Service website: http://hdsc.nws.noaa.gov/hdsc/pfds/. Users can look up the appropriate rainfall details for their area if they are not already know or locally specified.
ARI Events Spreadsheet:
ARI (Years)
A range of typical Annual Recurrence Intervals (ARI) listed for the SCS method.
Note: The WQe option is a 3 month Water Quality Event.
Use
Check the ARIs to be solved during the Analysis
Depth
Cumulative depth multiplier to the SCS hyetograph distribution - discussed below.
Run Time
Simulation run time, by default this is twice the hyetograph duration (24hours for standard SCS hyetograph).
Distribution
SCS hyetograph distributions Type 1, 1A, 2 and 3 are available by default. If an SCS hyetograph other than these is desired it is recommended to use the Design Storm (User Defined) option.