WMS:Riverside County Lag Time Equation: Difference between revisions

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The Riverside County Flood Control and Water Conservancy District developed three different lag equations corresponding to mountainous, foothill, and valley areas near Riverside County, California (Anonymous, 1963).
The Riverside County Flood Control and Water Conservancy District developed three different lag equations corresponding to mountainous, foothill, and valley areas near Riverside County, California (Anonymous, 1963).


:[[Image:image113.gif]]
:<math>T_{LAG} = 1.20 \left ( \frac {L \ast L_{ca}}{ \sqrt {S}} \right )^{0.38} </math>
 
:''(Mountainous) 15.19''
:''(Mountainous) 15.19''


:[[Image:image114.gif]]
:<math>T_{LAG} = 0.72 \left ( \frac {L \ast L_{ca}}{ \sqrt {S}} \right )^{0.38} </math>
 
:''(Foothills) 15.20''
:''(Foothills) 15.20''


:[[Image:image115.gif]]
:<math>T_{LAG} = 0.38 \left ( \frac {L \ast L_{ca}}{ \sqrt {S}} \right )^{0.38} </math>
 
:''(Valleys) 15.21''
:''(Valleys) 15.21''


where:
where:


<math>T_{LAG}</math> = lag time in hours.
:''T<sub>LAG</sub>'' = 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 slope along the maximum flow path length in ft/mile.
:''S'' = weighted slope along the maximum flow path length in ft/mile.


The typical characteristics of watersheds for which the Riverside County equations were used include the following:
The typical characteristics of watersheds for which the Riverside County equations were used include the following:
Line 32: Line 29:


{{WMSMain}}
{{WMSMain}}
[[Category:Equations|Riverside]]
[[Category:WMS Basins|Riverside]]

Latest revision as of 15:13, 29 September 2017

The Riverside County Flood Control and Water Conservancy District developed three different lag equations corresponding to mountainous, foothill, and valley areas near Riverside County, California (Anonymous, 1963).

(Mountainous) 15.19
(Foothills) 15.20
(Valleys) 15.21

where:

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

The typical characteristics of watersheds for which the Riverside County equations were used include the following:

  • Areas from 2 to 650 square miles.


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