WMS:Eagleson Lag Time Equation: Difference between revisions
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where: | where: | ||
''T<sub>LAG</sub>'' = watershed lag time in hours. | :''T<sub>LAG</sub>'' = watershed lag time in hours. | ||
''L'' = maximum flow length in miles. | :''L'' = maximum flow length in miles. | ||
''L<sub>ca</sub>'' = length to the centroid in miles | :''L<sub>ca</sub>'' = length to the centroid in miles. | ||
:''S'' = weighted average slope of the maximum flow path in ft/mile. | |||
The typical characteristics of watersheds for which the Eagleson method was applied include the following: | The typical characteristics of watersheds for which the Eagleson method was applied include the following: |
Latest revision as of 15:12, 29 September 2017
Eagleson’s method (1962) for computing lag time in completely storm-sewered watersheds is given as follows:
where:
- TLAG = watershed lag time in hours.
- L = maximum flow length in miles.
- Lca = length to the centroid in miles.
- S = weighted average slope of the maximum flow path in ft/mile.
The typical characteristics of watersheds for which the Eagleson method was applied include the following:
- Areas from 0.22 to 7.5 square miles.
- L from 1 to 7 miles.
- Lca from 0.3 to 3 miles.
- S from 6 to 20 ft/mile.
- Impervious cover from 33 to 83 percent.
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