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HydroCAD® Stormwater Modeling - Since 1986
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Rainfall Setup Options
Each HydroCAD project contains it's own list of rainfall events, which can be defined using one of the following procedures. In most cases, use the first option that meets your needs. Option 1: Import events from another project that uses the same rainfall settings. This will make an exact copy of all the events used in the previous project. After importing the events, you can modify, add, or delete individual events as required. (The Import feature was added in HydroCAD 7.0) Option 2: Lookup events for a specific location. The standard lookup table covers most counties in the US where the Type I, IA, II, or III rainfalls are commonly used. Custom lookup tables may also be created for other regions. (The Lookup feature was added in HydroCAD 9.1) Option 3: Select from the library of 80+ predefined rainfall distributions (storms). Additional rainfalls are also available for download. After selecting the rainfall distribution, define each event using the appropriate rainfall depth for your location. This is usually a single 24-hour depth for each return period, which may be obtained from local stormwater regulations, NOAA Atlas 14, or another suitable source. Option 4: Generate synthetic rainfall distributions for a specific location using local precipitation frequency data (IDF curves) from NOAA, NRCC, or other rainfall sources. After generating the distributions you can automatically copy the events into the current project. Details here. Option 5: Create custom rainfall distribution(s) by hand, based on local mass or intensity curves. Details here. Then select the distribution(s) and create your rainfall events according to option 3, above. (Before using this option, contact HydroCAD support to see if the desired rainfall is already available.) For further information please read about rainfall issues.
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