WMS:Ramser Tc Equation: Difference between revisions

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where:
where:


:<math>t_c</math> = time of concentration in minutes.
:''t<sub>c</sub>'' = time of concentration in minutes.


:<math>L_c</math> = length of channel reach in feet.
:''L<sub>c</sub>'' = length of channel reach in feet.


:<math>S_c</math> = average channel slope in ft/ft.
:''S<sub>c</sub>'' = average channel slope in ft/ft.


For flow in concrete channels, <math>t_c</math> should be multiplied by 0.2.
For flow in concrete channels, ''t<sub>c</sub>'' should be multiplied by 0.2.





Revision as of 15:39, 6 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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