Over the years, there have been many different equations that have been developed for time of concentration. StormShed3G™ supports the following methods. Time of concentration is defined as the time for runoff to travel from the hydraulically most distant point of the watershed to a point of interest within the watershed. For most practical design projects, time of concentration is made up of multiple travel time components.
Time of concentration affects both the shape and peak of the runoff hydrograph. A shorter time of concentrations (TC) results in an increased peak runoff rate.