Question

In: Civil Engineering

Compute the runoff from 5 inches of rainfall on a 1000-acre watershed using Soil the Conservation...

Compute the runoff from 5 inches of rainfall on a 1000-acre watershed using Soil the Conservation Survey Curve Number method. The hydrologic soil group is B throughout the watershed. Antecedent moisture condition III is assumed. The land use is

20% residential area that is 30% impervious
80% pasture land with good condition.

Document the source of any and all parameters and values that you chose to use. You may have to search the internet to find a CN value to fit the classes indicated above.

Expert Solution

1000-acre watershed

HSG B

Antecedent moisture condition III

20% residential area (30% impervious)

80% pasture land with good condition

Storm = 5 in

Pasture land (CN = 39)

Residential area (CN = 57)

Adjusted Curve number for AMC III are

Residential area (CN = 57 * 1.33 = 75.81)

Pasture Land (CN = 39 * 1.517 = 59.163)

Composite CN = = = 62.4924

S = 1000/CN - 10 = 1000/62.4924 - 10 = 6 in

= 0.2 * 6 = 1.2 in

Runoff, Q =

Q = = 1.4735 in

Runoff volume = Area * Q = 1000 * 1.4735= 1473.5 acre-in = 122.792 acre-ft

Ally Wells answered 2 years ago

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