# National Resources Conservation Service Watershed Lag Time Calculator

## Watershed Hydrology Equations Formulas

Solving for watershed lag time.

#### Inputs:

 watershed hydraulic length (L) meterangstromattometercentimeterchaindekameterdecimeterexameterfemtometerfootgigameterhectometerinchkilometerlight yearlinkmegametermicrometermicronmilemillimeternanometerparsecpetameterpicometerrodterameteryard
 potential watershed storage (S) meterangstromattometercentimeterchaindekameterdecimeterexameterfemtometerfootgigameterhectometerinchkilometerlight yearlinkmegametermicrometermicronmilemillimeternanometerparsecpetameterpicometerrodterameteryard
 average watershed slope (ws)

#### Conversions:

 watershed hydraulic length (L)= 0 = 0foot
 potential watershed storage (S)= 0 = 0inch
 average watershed slope (ws)= 0 = 0

#### Solution:

 watershed lag time (tL)= NOT CALCULATED

#### Other Units:

Change Equation
Select to solve for a different unknown
Izzard formula
 time of concentration overland flow distance retardance coefficient slope
Kerby formula
 time of concentration flow length retardance roughness coefficient
Kirpich formula
 time of concentration travel length slope
Kinematic wave formula
 time of concentration overland flow length Manning's overland flow roughness coefficient rainfall intensity average overland flow path slope
National Resources Conservation Service
 time of concentration watershed lag time
 watershed lag time watershed hydraulic length potential watershed storage average watershed slope
Bransby Williams Equation
 time of concentration channel length watershed area linear profile 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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