# French Drain Equations Formulas Design Calculator

## Fluid Mechanics Hydraulics

Solving for area normal to flow per foot of trench.

#### Inputs:

 seepage rate or flow per foot of trench (QL) foot^3/day-foot
 permeability (K) meter/secondcentimeter/hourcentimeter/secondfoot/dayfoot/hourfoot/minutefoot/secondinch/dayinch/hourinch/minuteinch/secondkilometer/daykilometer/hourkilometer/minutekilometer/secondknotmach sea level 15 Cmeter/daymeter/hourmeter/minutemile/daymile/hourmile/minutemile/secondmillimeter/secondspeed of light in vacuumyard/second
 flow line slope (S)

#### Conversions:

 seepage rate or flow per foot of trench (QL)= 0 = 0foot^3/day-foot
 permeability (K)= 0 = 0foot/day
 flow line slope (S)= 0 = 0

#### Solution:

 area normal to seepage flow/foot of trench (A)= NOT CALCULATED

#### Other Units:

Change Equation
Select to solve for a different unknown
saturated soil seepage rate into drain
 seepage rate or flow per foot of trench permeability area normal to flow per foot of trench flow 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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