Determine the time of concentration, tc, for use in the Rational Method for a drainage basin having a hydraulic path described as follows: Overland flow: average grass, 100’ long, 3.5% average slope...

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

Overland flow: average grass, 100’ long, 3.5% average slope

Shallow concentrated flow: 200’ long, 3.5% average slope