What is the "C" value (Rational method) for a playground with a 3% grade and a...

What is the "C" value (Rational method) for a playground with a 3% grade and a 50 year design storm frequency?

Expert Solution

Soln)

Where-

i = % Imperviousness

C_A = Runoff coefficient for Natural Resources Conservation Service (NRCS) HSG A soils

C_B = Runoff coefficient for NRCS HSG B soils

C_C/D = Runoff coefficient for NRCS HSG C and D soils.

For Playground i = 25%

i = 0.25

It is a playgroung, considering Group C & D soil for 50yr Return Period

C_C/D = 0.49i+0.393

= 0.49 x 0.25 + 0.393

C = 0.515

Ally Wells answered 6 months ago

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