WMS:Putnam Lag Time Equation: Difference between revisions
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where: | where: | ||
T<sub>LAG</sub> | T<sub>LAG</sub> = lag time in hours. | ||
L | L = maximum flow length in miles. | ||
S | S = weighted slope along the maximum flow path in ft/mile. | ||
I<sub>a</sub> | I<sub>a</sub> = Impervious cover as a fraction. | ||
This equation was used for watersheds ranging in size from 0.3 to 150 sq. miles, impervious covers less than 0.3 and a ratio of between 1.0 and 9.0. | This equation was used for watersheds ranging in size from 0.3 to 150 sq. miles, impervious covers less than 0.3 and a ratio of between 1.0 and 9.0. | ||
Revision as of 20:49, 26 February 2013
Putnam (1972) developed a lag equation for watersheds around the Wichita, Kansas area as follows:
where:
TLAG = lag time in hours.
L = maximum flow length in miles.
S = weighted slope along the maximum flow path in ft/mile.
Ia = Impervious cover as a fraction.
This equation was used for watersheds ranging in size from 0.3 to 150 sq. miles, impervious covers less than 0.3 and a ratio of between 1.0 and 9.0.
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