WMS:Putnam Lag Time Equation: Difference between revisions
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where: | where: | ||
''T<sub>LAG</sub>'' = lag time in hours. | :''T<sub>LAG</sub>'' = lag time in hours. | ||
''L'' = maximum flow length in miles. | :''L'' = maximum flow length in miles. | ||
''S'' = weighted slope along the maximum flow path in ft/mile. | :''S'' = weighted slope along the maximum flow path in ft/mile. | ||
''I<sub>a</sub>'' = Impervious cover as a fraction. | :''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. | ||
Latest revision as of 15:13, 29 September 2017
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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