WMS:Ramser Tc Equation
From XMS Wiki - http://wikis.aquaveo.com/xms/
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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