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HydroCAD® Stormwater Modeling - Since 1986
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NRCS-Rain Event Lookup TableThe NRCS-Rain table (added in HydroCAD-10 build 21), provides NRCS rainfall database based on Atlas-14, and uses new NRCS rainfall distributions including NOAA, NRCC, and MSE, which are replacing the earlier Type I, IA, II and III distributions in many states. NRCS-Rain is based primarily on the NRCS WinTR-55 database update 1.00.10 DB released 4/20/15. The intent of this table is to accurately represent the rainfall data published by NRCS at that time. If updated data becomes available from NRCS, we will endeavor to provide that information by way of a new lookup table, rather than making changes to the original NRCS-Rain table. If new rainfall data is published by individual states, that information will generally be incorporated by the addition of a separate lookup table, such as NJ-2023-Rain. Rainfall Usage by StateThis table summarizes the rainfall distributions used for each state in the NRCS-Rain event lookup table. As always, check your local stormwater regulations for exact requirements, which may differ from the NRCS recommendations discussed on this page.
Note: This lookup table has been superseded by the newer NRCS2-Rain, which is expected to be gradually adopted in most jurisdictions.
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