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Izzard Time Of Concentration Equations Formulas Calculator
Watershed Hydrology


Solving for retardance coefficient.

retardance coefficient


Inputs:
time of concentration (tc
rainfall intensity (i) 
slope (S) 
overland flow distance (L) 


Conversions:
time of concentration (tc) = 0    = 0  minute
rainfall intensity (i) = 0    = 0  inch/hour
slope (S) = 0    = 0  
overland flow distance (L) = 0    = 0  foot


Solution:
retardance coefficient (cr)  =  HAS NOT BEEN CALCULATED 


Other Units:


Change Equation
Select an equation to solve for a different unknown

Izzard formula
time of concentration time of concentration
overland flow distance overland flow distance
retardance coefficient retardance coefficient
slope slope

Kerby formula
time of concentration time of concentration
flow length flow length
retardance roughness coefficient retardance roughness coefficient

Kirpich formula
time of concentration time of concentration
travel length travel length
slope slope

Kinematic wave formula
time of concentration time of concentration
overland flow length overland flow length
Manning's overland flow roughness coefficient Manning's overland flow roughness coefficient
rainfall intensity rainfall intensity
average overland flow path slope average overland flow path slope

National Resources Conservation Service
time of concentration time of concentration
watershed lag time watershed lag time

watershed lag time watershed lag time
watershed hydraulic length watershed hydraulic length
potential watershed storage potential watershed storage
average watershed slope average watershed slope

Bransby Williams Equation
time of concentration time of concentration
channel length channel length
watershed area watershed area
linear profile slope 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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