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based on rain water collection we calculate the discharge by using equation Q = ciA
where Q = discharge , c = discharge coffienet , i = intensity and A = catchment Area
after calculatng discharge we use hydrograph
hydrograph is a graph showing the rate of flow (discharge) versus time past a specific point in a river, or other channel or conduit carrying flow. The rate of flow is typically expressed in cubic meters or cubic feet per second (cms or cfs).