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Calculate Required Underdrain Lateral Spacing:

Calculation:

Designer/Checker:

Input:

Metric Units

(Note: All input Metric units are converted to English units for the equations below and then the output English units are converted back to Metric)

Permeability rate of soil (K - ft/hr or m/hr)

Recovery time of the system (t - hr)

Depth to the drainage pipe from the natural ground elevation (dp - ft or m)

Depth from the natural ground elevation to the water table (c - ft or m)

Depth from the natural ground elevation to the impermeable layer (D - ft or m)

Output:

q =

m =

a =

Lateral Spacing, S =