Compute the peak runoff, Q p , for a 15-year storm using the Rational Method for a drainage basin located in Phoenix, Arizona, and having parameters as follows: A XXXXXXXXXXacres Time of concentration...

Compute the peak runoff, Q_p, for a 15-year storm using the Rational Method for a drainage basin located in Phoenix, Arizona, and having parameters as follows:

A 5 14.06 acres

Time of concentration Overland flow: average grass, 100’ long, 5.0% average slope

Shallow concentrated flow: 50’ long, 7.0% average slope Runoff coefficient

Impervious: 0.06 acres

Grass: 6.5 acres

Woods: 7.5 acres

Note: In the Arizona I-D-F curves, a 15-year storm is located by the corresponding P₁
value, which for Phoenix is 1.75 inches.