A 10-acre pasture site (moderate slope, sandy soil) is to be developed to a high-density single...

Question

A 10-acre pasture site (moderate slope, sandy soil) is to be developed to a high-density single family subdivision. Calculate the range of the estimated increase in runoff due to development for a 1 inch/hour rainfall. Use a range of values for the pre-development runoff coefficient and a single value for post-development runoff coefficient.

Banasree · Accepted Answer

Ans.  Q = CiA
Estimated run off will be 7%+, pasture, sandy soil, steep = 0.25 min
C value 
Area description - Single Family Area = 0.3-0.50
Surface characteristic – Sandy soil, Pasture = 0.10 – 0.25
Run off coefficient
Pasture = 0.12
A = 10  acre =  40468.6 sqm 
1 inch/hour = 25.4mm/hr =  0.

A 10-acre pasture site (moderate slope, sandy soil) is to be developed to a high-density single family subdivision. Calculate the range of the estimated increase in runoff due to development for a 1...

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