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Water Quality System Calculator

Water Quality System Calculator

System Specifications

*Feet cannot be bigger than inches
Inlet Elevation*

(ft & in)

Outlet or Infiltration Bed Elevation*

(ft & in)

Type of System (Detention or Retention)

Void = Void Ratio

(%)

V(det) = Volume required for detention

(cfs)

Controlling Dimensions for System Layout

L(trench) = Trench Length

(feet)

Nheader = Number of Headers

t = Bedding Thickness

(inches)

d = Distance of trench sidewall (1.5’ typical)

(feet)

Calculate

Maximum Pipe Diameter

*System size could be increased by size of inlet pipe
Dmax = Inlet Elevation - Outlet Elevation

(feet)

Dmax

(inches)

Use Diameter - (OD)

(inches)

SC = Storage Capacity

(cfs/lf)

s = Center to Center Pipe Spacing

(inches)

s(pipe) = Spacing Between Pipes

(inches)

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