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Lab 7 Solutions

# Lab 7 Solutions - CEIE 340 Problem 1 problem 8.46 on page...

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CEIE 340 Lab 7 Solutions YHK Page 1 of 3 Problem 1. problem 8.46 on page 484 The loss of natural storage method is to be used to estimate the detention storage volume required to control the release from the watershed so that post-development peak flow is constrained to not exceed the pre-development peak flow. Because “runoff coefficients” are provided, the Rational Method is used to estimate the peak flows from the watershed. The required depth of storage is estimated to be 0.102 inches, and the required volume is estimated to be 0.196 acre-feet. The calculations are provided below: Pre-development Conditions Post-development Conditions Source Runoff Coefficient 0.20 0.40 Given Watershed Area [acres] 23 23 Given Time of Concentration [minutes] 15 9 Given Design Storm Return Period [years] 10 10 Given Rainfall Intensity [inches/hour] 5.5 6.3 Given Peak Flow, q p [cfs] 25.30 57.96 Eq 7.20 Runoff Depth [inches] 0.273 0.375 Eq 8.66 Volume of Storage, Vs [inches] 0.102 Eq 8.64 Volume of Storage [acre-feet] 0.196 Computed

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Lab 7 Solutions - CEIE 340 Problem 1 problem 8.46 on page...

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