WMS:Eagleson Lag Time Equation: Difference between revisions
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Eagleson’s method (1962) for computing lag time in completely storm-sewered watersheds is given as follows: | Eagleson’s method (1962) for computing lag time in completely storm-sewered watersheds is given as follows: | ||
:<math>T_{LAG} = 0.32 \left ( \frac {L \ast L_{ca}}{ \sqrt {S}} \right )^{0.39} </math> | |||
where: | where: | ||
Revision as of 20:25, 26 February 2013
Eagleson’s method (1962) for computing lag time in completely storm-sewered watersheds is given as follows:
where:
= watershed lag time in hours.
= maximum flow length in miles.
= length to the centroid in miles.
= 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.
- from 1 to 7 miles.
- from 0.3 to 3 miles.
- from 6 to 20 ft/mile.
- Impervious cover from 33 to 83 percent.
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