Infiltration BasinDesign Notes Cont’d

• Bottom surface area of basin is determined by:

Ab = [2Vw - At db] / [db - 2P + 2fT]

Where:

Ab = bottom surface area of basin

Vw = design volume entering basin (e.g., WQv)

At = top surface area of basin

db = basin depth based on the depth required above seasonal groundwater table or a depth less than dmax, whichever is smaller

P = design storm rainfall depth

f = infiltration rate of basin

T = time to fill basin (generally assumed to be less than 2 hours)

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Basin bottom surface area is determined by the above equation.