WMS:Putnam Lag Time Equation: Difference between revisions

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


''T<sub>LAG</sub>'' = lag time in hours.
:''T<sub>LAG</sub>'' = lag time in hours.


''L'' = maximum flow length in miles.
:''L'' = maximum flow length in miles.


''S'' = weighted slope along the maximum flow path in ft/mile.
:''S'' = weighted slope along the maximum flow path in ft/mile.


''I<sub>a</sub>'' = Impervious cover as a fraction.
:''I<sub>a</sub>'' = 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.
Line 22: Line 22:
{{WMSMain}}
{{WMSMain}}
[[Category:Equations|Putnam]]
[[Category:Equations|Putnam]]
[[Category:WMS Basins|Putnam]]


{{stub}}
{{stub}}

Latest revision as of 15:13, 29 September 2017

Putnam (1972) developed a lag equation for watersheds around the Wichita, Kansas area as follows:

where:

TLAG = lag time in hours.
L = maximum flow length in miles.
S = weighted slope along the maximum flow path in ft/mile.
Ia = 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