WMS:Ramser Tc Equation: Difference between revisions
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: <math>t_c = 0.008 L_c ^{0.77} S_c ^{-0.385} </math> | : <math>t_c = 0.008 L_c ^{0.77} S_c ^{-0.385} </math> | ||
where: | where: | ||
<math>t_c</math> = time of concentration in minutes. | |||
<math>L_c</math> = length of channel reach in feet. | |||
<math>S_c</math> = average channel slope in ft/ft. | |||
For flow in concrete channels, | For flow in concrete channels, <math>t_c<math> should be multiplied by 0.2. | ||
Revision as of 21:09, 22 February 2013
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:
= time of concentration in minutes.
= length of channel reach in feet.
= average channel slope in ft/ft.
For flow in concrete channels, <math>t_c<math> should be multiplied by 0.2.
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