Abstract
The transformation of rainfall over a catchment area into a flow hydrograph that may be used as an input to a pipe flow model involves two steps. First, the rainfall losses due to interception, wetting, depression storage, infiltration and evaporation are abstracted from rainfall. Only the remaining part, called net rainfall, will produce storm runoff. The net rainfall is then transformed into a flow hydrograph for the area. This transformation, called surface routing, accounts for temporal distribution of the net rainfall at the outlet of the area, caused by overland flow processes.
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