Enter the flow path length, and the flow path slope into the calculate to determine the time of concentration on a small basin (1-112 acres).
Time of Concentration Formula
The following equation is one of many different equations for calculating the time of concentration.
Tc = (.0078 * Lc) ^ .77 / Sc ^ .385
- Where Tc is the time of concentration
- Lc is the flow path length
- Sc is the flow path slope
Time of Concentration Definition
A time of concentration is defined as the time it takes runoff water to travel from the hydraulically most distance point in a water shed to the outlet of the watershed.
Time of Concentration Example
How to calculate time of concentration?
- First, determine the flow path length.
Measure or calculate the total flow path length or length of the channel.
- Next, determine the flow path slope.
Measure or calculate the slope of the flow path or channel.
- Finally, calculate the time of concentration.
Calculate the time of concentration using the equation above.
The time of concentration is the time is takes water runoff to flow to an outlet. There are many equations to calculate this because there are many different geographies of runoff. The equation above should only be used for simple channels and small basins.
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