The rainfall distribution for a given storm is shown below. If the total loss du

Question

The rainfall distribution for a given storm is shown below. If the total loss due to infiltration and evaporation is 3.00 inches and takes place uniformly during the storm. find the total hydrograph and plot it. (Note: the following unit graphs arc available). Determine the total runsoff time (hrs), volume of the ranoff (in cubic feet) and area of watershed (in acres). From the selected Unit Hydrograph in part (a) recomputed the total hydrograph for the given rainfall, using a 1-hr unit hydrograph.

Explanation / Answer

see loss is 3inch in 6hrs i.e. 3in/6hr = 0.5 in/hr net rainfall for eachr hr is then given by subtracting 0.5 in/hr from upper graph for 0-1 hr = 0 in 1-2 hr =0.5in 2-3 hr=1in 3-4 hr =0.5in 4-5= 0in 5-6 = 0 in now there is 2in of excess rainfall for plotting hydrograph we need unit hydrograph of a region for total hudrograph Q = 0.5 Q (of unit hydrograph) + 1Q ( of unit Hydrograph lagged by an hour) + 0.5Q ( of unit Hydrograph lagged by 2 hours) this will give you Q at every time for hydrograph Volume of Runoff = Area of Total hydrograph Area of Catchment = Area of Unit Hydrograph

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