WMS:Eagleson Lag Time Equation: Difference between revisions
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where: | where: | ||
< | ''T<sub>LAG</sub>'' = watershed lag time in hours. | ||
''L'' = maximum flow length in miles. | |||
< | ''L<sub>ca</sub>'' = length to the centroid in miles. | ||
''S'' = weighted average slope of the maximum flow path in ft/mile. | |||
Line 17: | Line 17: | ||
*Areas from 0.22 to 7.5 square miles. | *Areas from 0.22 to 7.5 square miles. | ||
* | *''L'' from 1 to 7 miles. | ||
*< | *''L<sub>ca</sub>'' from 0.3 to 3 miles. | ||
* | *''S'' from 6 to 20 ft/mile. | ||
*Impervious cover from 33 to 83 percent. | *Impervious cover from 33 to 83 percent. | ||
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{{WMSMain}} | {{WMSMain}} | ||
[[Category:Equations| | [[Category:Equations|Eagleson]] | ||
[[Category:WMS Basins|Eagleson]] | |||
{{stub}} | {{stub}} |
Revision as of 16:05, 7 December 2016
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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