Determine time of concentration, t c , for use in the Rational Method for a drainage basin having a hydraulic path described as follows: Overland flow: average grass, 80’ long, 2.5% average slope...

Determine time of concentration, t_c, for use in the Rational Method for a drainage basin having a hydraulic path described as follows:

Overland flow: average grass, 80’ long, 2.5% average slope

Shallow concentrated flow: 450’ long, 4.8% average slope