French Drain Equations Formulas Design Calculator

Fluid Mechanics Hydraulics

Solving for flow line slope.

flow line slope


seepage rate or flow per foot of trench (QL)
permeability (K)
area normal to seepage flow/foot of trench (A)


seepage rate or flow per foot of trench (QL)
= 0
= 0
permeability (K)
= 0
= 0
area normal to seepage flow/foot of trench (A)
= 0
= 0


flow line slope (S)

Other Units:

Change Equation
Select to solve for a different unknown
saturated soil seepage rate into drain
seepage rate or flow per foot of trenchseepage rate or flow per foot of trench
area normal to flow for one foot of trencharea normal to flow per foot of trench
flow line slopeflow line slope

References - Books:
Martin Wanielista, Robert Kersten and Ron Eaglin. 1997. Hydrology Water Quantity and Quality Control. John Wiley & Sons. 2nd ed.
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