WMS:Putnam Lag Time Equation: Difference between revisions
From XMS Wiki
Jump to navigationJump to search
No edit summary |
No edit summary |
||
| Line 5: | Line 5: | ||
where: | where: | ||
<math>T_{LAG}</math> = lag time in hours. | |||
L = maximum flow length in miles. | <math>L</math> = maximum flow length in miles. | ||
S = weighted slope along the maximum flow path in ft/mile. | <math>S</math> = weighted slope along the maximum flow path in ft/mile. | ||
<math>I_a</math> = Impervious cover as a fraction. | |||
This equation was used for watersheds ranging in size from 0.3 to 150 sq. miles, impervious covers less than 0.3 and a ratio of between 1.0 and 9.0. | This equation was used for watersheds ranging in size from 0.3 to 150 sq. miles, impervious covers less than 0.3 and a ratio of between 1.0 and 9.0. | ||
Revision as of 20:50, 26 February 2013
Putnam (1972) developed a lag equation for watersheds around the Wichita, Kansas area as follows:
where:
= lag time in hours.
= maximum flow length in miles.
= weighted slope along the maximum flow path in ft/mile.
= Impervious cover as a fraction.
This equation was used for watersheds ranging in size from 0.3 to 150 sq. miles, impervious covers less than 0.3 and a ratio of between 1.0 and 9.0.
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 | ||
