Infiltration BasinDesign Notes Cont’d

• Top length of basin (assuming a rectilinear shape) is determined by:

Lt = [Vw + Zdb (Wt – 2 Zdb)] / [Wt (db – P) – Zdb2]

Where:

Lt = top length of basin

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

Z = side slope ratio of basin (h:v)

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

Wt = top width of basin

P = design rainfall event

Note: The basin top length and width should be greater than 2Zdb

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Basin top length is determined by the above equation.