WMS:Ramser Tc Equation: Difference between revisions
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Ramser (1927) developed an equation for computing the time of concentration in well-defined channels. The equation is based on the length and slope of the channel. | Ramser (1927) developed an equation for computing the time of concentration in well-defined channels. The equation is based on the length and slope of the channel. | ||
: | : <math>t_c = 0.008 L_c ^{0.77} S_c ^{-0.385} </math> | ||
where: | where: | ||
t<sub>c</sub> | :''t<sub>c</sub>'' = time of concentration in minutes. | ||
L<sub>c</sub> | :''L<sub>c</sub>'' = length of channel reach in feet. | ||
S<sub>c</sub> | :''S<sub>c</sub>'' = average channel slope in ft/ft. | ||
For flow in concrete channels, | For flow in concrete channels, ''t<sub>c</sub>'' should be multiplied by 0.2. | ||
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{{WMSMain}} | {{WMSMain}} | ||
[[Category:Equations|Ramser]] | |||
[[Category:WMS Basins|Ramser]] | |||
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Latest revision as of 15:57, 7 December 2016
Ramser (1927) developed an equation for computing the time of concentration in well-defined channels. The equation is based on the length and slope of the channel.
where:
- tc = time of concentration in minutes.
- Lc = length of channel reach in feet.
- Sc = average channel slope in ft/ft.
For flow in concrete channels, tc should be multiplied by 0.2.
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