WMS:Eagleson Lag Time Equation: Difference between revisions
From XMS Wiki
Jump to navigationJump to search
No edit summary |
No edit summary |
||
| (5 intermediate revisions by the same user not shown) | |||
| Line 1: | Line 1: | ||
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: | ||
T<sub>LAG</sub> | :''T<sub>LAG</sub>'' = watershed lag time in hours. | ||
L | :''L'' = maximum flow length in miles. | ||
L<sub>ca</sub> | :''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: | ||
*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'' from 1 to 7 miles. | ||
*L<sub>ca</sub> from 0.3 to 3 miles. | *''L<sub>ca</sub>'' from 0.3 to 3 miles. | ||
*S from 6 to 20 ft/mile. | *''S'' from 6 to 20 ft/mile. | ||
*Impervious cover from 33 to 83 percent. | *Impervious cover from 33 to 83 percent. | ||
| Line 28: | Line 27: | ||
{{WMSMain}} | {{WMSMain}} | ||
[[Category:Equations|Eagleson]] | |||
[[Category:WMS Basins|Eagleson]] | |||
{{stub}} | |||
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.
Related Topics
WMS – Watershed Modeling System | ||
|---|---|---|
| Modules: | Terrain Data • Drainage • Map • Hydrologic Modeling • River • GIS • 2D Grid • 2D Scatter |  |
| Models: | CE-QUAL-W2 • GSSHA • HEC-1 • HEC-HMS • HEC-RAS • HSPF • MODRAT • NSS • OC Hydrograph • OC Rational • Rational • River Tools • Storm Drain • SMPDBK • SWMM • TR-20 • TR-55 | |
| Toolbars: | Modules • Macros • Units • Digitize • Static Tools • Dynamic Tools • Drawing • Get Data Tools | |
| Aquaveo | ||
