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> | : <math>t_c = 0.008 L_c ^{0.77} S_c ^{-0.385} </math> | ||
Revision as of 17:55, 9 August 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, should be multiplied by 0.2.
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