WMS:Eagleson Lag Time Equation: Difference between revisions

From XMS Wiki
Jump to navigationJump to search
No edit summary
 
(2 intermediate revisions by the same user not shown)
Line 5: Line 5:
where:
where:


<math>T_{LAG}</math> = watershed lag time in hours.
:''T<sub>LAG</sub>'' = watershed lag time in hours.


<math>L</math> = maximum flow length in miles.
:''L'' = maximum flow length in miles.


<math>L_{ca}</math> = length to the centroid in miles.
:''L<sub>ca</sub>'' = length to the centroid in miles.
 
<math>S</math> = weighted average slope of the maximum flow path in ft/mile.


:''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.
*<math>L</math> from 1 to 7 miles.
*''L'' from 1 to 7 miles.
*<math>L_{ca}</math> from 0.3 to 3 miles.
*''L<sub>ca</sub>'' from 0.3 to 3 miles.
*<math>S</math> 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|E]]
[[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


v • e
WMS – Watershed Modeling System
Modules:Terrain Data  •   Drainage  •   Map  •   Hydrologic Modeling  •   River  •   GIS  •   2D Grid  •   2D ScatterWMS.PNG
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
Retrieved from "https://www.xmswiki.com/index.php?title=WMS:Eagleson_Lag_Time_Equation&oldid=130043"