Determine time of concentration, t c , for use in the NRCS Method for a drainage basin located near Bismarck, North Dakota, having a hydraulic path described as follows: Overland flow: average grass,...

Determine time of concentration, t_c, for use in the NRCS Method for a drainage basin located near Bismarck, North Dakota, having a hydraulic path described as follows:

Overland flow: average grass, 100’ long, 1.6% average slope

Shallow concentrated flow: 680’ long, 3.2% average slope