HydroCAD® Stormwater Modeling - Since 1986


Standard Rainfall Tables

Click for complete self-training materialsThe following standard rainfall tables are provided with HydroCAD.  Any storms added since the last HydroCAD release can be downloaded from this page.  (Right-click the link and save to your HydroCAD\Rainfall folder).

Most projects will use one of the standard SCS/NRCS rainfalls listed at the bottom of the page.  Additional tables may be created by following the instructions in the rainfall.txt file which is installed in your HydroCAD\Rainfall folder.

(Unless otherwise noted, each rainfall is included with all versions of HydroCAD starting with 6.0.)

Austin 3-hr (2, 5, 10, 25, 50,  & 100 year events for Austin, Texas)

Charlotte 6-hr (2 & 10 year "Balanced Rainfall" events for Charlotte, NC)

Chicago Storm: This term refers to a technique for using IDF coefficients to define a mass curve.  This is illustrated in the "Sample D" rainfall table (installed with HydroCAD-8 and later) and discussed in the rainfall.txt file.  (This format is also used to define the South African rainfall tables, listed below.)

Constant Intensity (Usable at any duration - Added in HydroCAD 7.0)

Eastern Washington State (Added in HydroCAD 7.1)
    Short Duration;  Long Duration: Region 1, Region 2, Region 3, Region 4

Fayette  5-hr 1995  (Fayette County, KY, Added in HydroCAD 7.0)
Fayette  6-hr  10-yr
Fayette  6-hr 100-yr
Fayette 18-hr 1992

Fayette05  6-hr  10-yr  (Fayette County, KY - revised 2005 rainfalls, Added in HydroCAD 7.1)
Fayette05  6-hr 100-yr
Fayette05 24-hr  10-yr
Fayette05 24-hr 100-yr

FDOT 1, 2, 4, 8, & 24-hour (Florida DOT)
FDOT 3, 7, & 10-day

Huff 0-10sm (1,2,3,4th quartiles)  (IL Huff distributions: ISWS Bulletin-71 & Circular-173)
Huff 10-50sm (1,2,3,4th quartiles)
Huff 50-400sm (1,2,3,4th quartiles)

Huff B70 0-10sm 1Q  (IL Huff distributions: ISWS Bulletin-70, Download only)
Huff B70 0-10sm 2Q
Huff B70 0-10sm 3Q
Huff B70 0-10sm 4Q

Indy Huff 24-hr (Indianapolis Stormwater Manual 5/10/95)
Indy Huff 1st Quartile  2nd Quartile  3rd Quartile  4th Quartile  (Indianapolis SQU Guide 7/20/06)

NJ DEP 2-hr (New Jersey DEP Water Quality Storm, Added in HydroCAD 7.1)

Orange County, Florida: 6-hour  24-hour  (Download only.  Use with 10, 25, or 100 year depth)

San Diego (6 & 24-hr)  (San Diego Country, CA, Added in HydroCAD 6.1)

Seattle 24-hr

SEWRPC-90  (SE Wisconsin 90th Percentile storm, Added in HydroCAD-7.0)

SFWMD (24 & 72-hr)  (Southern Florida Water Management District)

SJRWMD (Saint John's River Water management District) 96-hour rainfall based on the SCS Type II 24-hour rainfall according to Section 14.2 of the MSSW Handbook.  Available in half hour increments as described in MSSW, or tenth hour increments for greater accuracy and consistency with the Type II storm on which it is based:   half-hour   tenth-hour

South Africa 24-hr rainfalls (download only):
    Tabular rainfalls:  Type 1, Type 2, Type 3, Type 4  (for any HydroCAD version)
    Coefficient rainfalls:  Type 1, Type 2, Type 3, Type 4  (requires HydroCAD-8 or later)
    Rainfall type and depth maps:  1MB PDF

Spillway Emergency  (SCS Emergency Spillway Hydrograph - ESH.  Also used as Type II 6-hr storm)
Spillway 1-day 10-day  (SCS Principle Spillway Hydrograph - PSH)

Thurston 24-hr (0.5, 2, 10, 25, 50, 100-yr)  (Thurston County, WA)
Thurston 24-hr 1990
Thurston 7-day 100-yr

Standard SCS/NRCS rainfall distributions:
Type I 24-hr (coefficient-based)
Type IA 24-hr (coefficient-based)
Type II 24-hr (coefficient-based)
Type II FL 24-hr (Florida Modified)
Type IIA CS 24-hr (Colorado Springs Modified, Added in HydroCAD 6.1)
Type III 24-hr (coefficient-based)

Tabular versions of SCS/NRCS rainfalls
(Recommended only for direct TR-20 comparisons - download only)
Type I 24-hr Tabular
Type IA 24-hr Tabular
Type II 24-hr Tabular
Type II 48-hr Tabular
Type III 24-hr Tabular
 

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