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The Rational Method is one of the simplest and best known methods routinely applied in urban hydrology. Peak flows are computed from the simple equation: Q = kCiA where: Q - Peak flow With WMS' capability to create TINs from feature arc data, roads, railroads, canals, and other urban features which control runoff are easily incorporated into the model so that an urban catchment area can be delineated so that the variable A can be automatically computed. |
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The Rational Method main dialog will include the capability to generate Intensity-Duration-Frequency (IDF) curves from HYDRO-35 maps (eastern U.S.), NOAA Atlas maps (western U.S.), or user specified data of rainfall intensities. A kinematic wave equation used by the Federal Highways Administration (FHA) design handbook can be used to estimate the time of concentration from the catchment length, slope, and a Manning's roughness coefficient. |
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Watershed Modeling System (WMS) Overview |
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Scientific Software Group P.O Box 708188 Sandy, Utah 84070
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