Calculate peak runoff using the NRCS Method for the watershed shown in Figure 11-18 for a 50-year storm. The watershed is located in central New York State. For an average stream cross section, use...

Calculate peak runoff using the NRCS Method for the watershed shown in Figure 11-18 for a 50-year storm. The watershed is located in central New York State. For an average stream cross section, use that in problem 6. Assume hydrologic soil group B (65 percent), C (25 percent), D (10 percent).

Determine time of concentration, tc, 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

Stream flow: 2950’ long, 0.61% average slope

Average cross section: