Lab 8 Solutions

# Lab 8 Solutions - CEIE 340 Lab 8 Solutions YHK Problem 1...

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CEIE 340 Lab 8 Solutions YHK Page 1 of 4 Problem 1. problem 8.49 on page 485 In this problem, the SCS rainfrall-runoff equation is to be used to estimate the depth of runoff from a 54-acre watershed before and after development. The relevant computations are provided here: Pre-development Conditions Post-development Conditions Source SCS Curve Number 72 82 Given Watershed Area [acres] 54 54 Given Time of Concentration [minutes] 45 20 Given Time of Concentration [hours] 0.75 0.33 Computed Design Storm Return Period [years] 10 10 Given Rainfall Intensity of 24- hour storm [inches/hour] 0.21 0.21 Table provided with the lab statement Rainfall depth for 24- hour storm, P [inches] 5.04 5.04 Computed S = 1000/CN-10 3.889 2.195 Eq 7.43 on page 390 Is P>0.2S yes yes Test to determine whether the SCS method may be used Runoff from 24-hr storm, Q [inches] 2.229 3.115 Eq 7.42 on page 389 Volume of Storage, Vs [inches] 0.89 Eq 8.64 on page 453 Volume of Storage [acre-feet] 3.99 Computed The volume of detention storage needed is estimated to be 3.99 acre-feet resulting from a runoff depth of 0.89 inches.

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CEIE 340 Lab 8 Solutions YHK Page 2 of 4 Problem 2. problem 8.61 on page 486
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Lab 8 Solutions - CEIE 340 Lab 8 Solutions YHK Problem 1...

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