Determine the storm hydrograph resulting from the rainfall pattern below using the triangular 1-hr UH. 5.0 2.0 1.8 4.0 1.6 1.4 3.0 1.2 1.0 2.0 0.8 0.6 1.0 0.4 0.2 0.0 0.0 1 2 3 2 4 3 Time [hr] 1 Time [hr] Rainfall Intensity [in./hr] Flow[cfs] O O

A rainfall hyetograph is provided for a 6-hour storm event, which occurred over a watershed with an area of 2100-acres (Ac). If the Phi-index is 0.71 in/hr, calculate the volume of runoff (VRO) from the storm (in Ac-ft). Report your answer to the nearest tenths (0.1) place. HINT...the answer should be around the 500-1,500 Ac-ft range (yes, it is a big range if you need to guess). Intensity (in/hr) 2.5 2.0 1.5 1.0 0.5 0.0 0 1 2 3 4 Time (hr) 5 6 7 2

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