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An impervious area of 0.95 hectare has a runoff rational coefficient C=0.9, Manning overland flow n= 0.03 , average flow length L=50 m, and average slope S=0.1%. If the area is directly connected to a storm sewer, estimate the design runoff Qp(ft³ /sec). Use Morgali and Linsley equation to find the time of concentration for the 10 -year return period from the IDF curve i=124/(t꜀⁰.⁸¹+6.19), where i is in "in/hr" and tc in "min".
Sagot :
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