# Izzard Time Of Concentration Equations Formulas Calculator

## Watershed Hydrology

Solving for overland flow distance.

#### Inputs:

 time of concentration (tc) second century day decade hour millisecond minute week year rainfall intensity (i) meter/second centimeter/hour centimeter/second foot/day foot/second inch/hour inch/second kilometer/hour kilometer/second knot mach sea level 15 C meter/day mile/hour mile/second millimeter/second speed of light in vacuum yard/second slope (S) retardance coefficient (cr)

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#### Conversions:

 time of concentration (tc) = 0 = 0 minute rainfall intensity (i) = 0 = 0 inch/hour slope (S) = 0 = 0 retardance coefficient (cr) = 0 = 0

#### Solution:

 overland flow distance (L) = HAS NOT BEEN CALCULATED

#### Other Units:

Change Equation
Select an equation 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.

by Jimmy Raymond