National Resources Conservation Service Watershed Lag Time Calculator

Watershed Hydrology Equations Formulas


Solving for watershed hydraulic length.
watershed hydraulic length

Inputs:

watershed lag time (tL)
average watershed slope (ws)
potential watershed storage (S)


Conversions:

watershed lag time (tL)
= 0
= 0
hour
average watershed slope (ws)
= 0
= 0
potential watershed storage (S)
= 0
= 0
inch

Solution:

watershed hydraulic length (L)
= NOT CALCULATED

Other Units:


Change Equation
Select to solve for a different unknown
Izzard formula
time of concentrationtime of concentration
overland flow distanceoverland flow distance
retardance coefficientretardance coefficient
slopeslope
Kerby formula
time of concentrationtime of concentration
flow lengthflow length
retardance roughness coefficientretardance roughness coefficient
Kirpich formula
time of concentrationtime of concentration
travel lengthtravel length
slopeslope
Kinematic wave formula
time of concentrationtime of concentration
overland flow lengthoverland flow length
Manning's overland flow roughness coefficient Manning's overland flow roughness coefficient
rainfall intensityrainfall intensity
average overland flow path slopeaverage overland flow path slope
National Resources Conservation Service
time of concentrationtime of concentration
watershed lag timewatershed lag time
watershed lag timewatershed lag time
watershed hydraulic lengthwatershed hydraulic length
potential watershed storagepotential watershed storage
average watershed slopeaverage watershed slope
Bransby Williams Equation
time of concentrationtime of concentration
channel lengthchannel length
watershed areawatershed area
linear profile slopelinear 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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