Maximum persons are having idea about the run off. If you know just share your knowledge here or add this knowledge in your mind about it. Run off means the draining or flowing off of precipitation from a catchments area through a surface channel. It thus represents the output from the catchment in a given unit of time. Consider a catchment area receiving precipitation. For a given precipitation, the evapotranspiration, initial loss, infiltration and detentions storage requirement will have to be first satisfied before the commencement of runoff.
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