The characteristic width can be estimated in the tool using all of the following methods. The user needs to have a proper understanding of the basin characteristics and the overland flow behavior when estimating subcatchment width.įig.5.21: Concept of the Characteristic Width of an Ideal Rectangular Shaped Subcatchmentįig.5.22: Representation of the Characteristic Width for a Non-uniform Subcatchment It is one of the key calibration parameters in a SWMM model because it can significantly alter the runoff hydrograph properties. ![]() However, in reality, subcatchments are shaped like non-uniform polygons and therefore the width cannot be estimated in a straightforward manner (Fig. If the overland flow line is represented by the physical width of an ideal rectangular shaped subcatchment, then the characteristic width will be the physical length of that rectangle (Fig. ![]() It depends on the characteristics of the overland flow length and the shape of the subcatchment. ![]() The characteristic width is a special hydrologic parameter for a subcatchment that affects the time of concentration and determines the shape of the runoff hydrograph.
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