The time of concentration is defined as the longest time that will be required for a drop of water to flow from the upper limit of the drainage area to the point of concentration.
The minimum times of concentration are shown below:
Parks and permanent open areas | 20 minutes |
Single-Family and Duplex residential | 10 minutes |
Multifamily, Business and Industrial | 10 minutes |
In cases where it is evident that the actual time of concentration is more than that indicated above, the longer time of concentration should be used.