A 0.45 km2 watershed has a composite runoff coefficient of 0.33. The overland flow distance to the beginning of a stream that drains the watershed is 200 m, and the ground slope is 5 %. The stream is 700 m long, with a drop in channel elevation of 50 m. Estimate the peak rate of runoff for the 100-year storm considering the overland flow time and the channel flow time.

An external consultant recommends that a plant installs a bank of capacitors for power factor correction. this will reduce the peak electrical demand charges by an average of 93 kw every month. the plant current pays $13 per kw in peak demand charges. the capacitor bank will include 223 kw of fixed capacitors, and 183 of variable capacitors. the fixed capacitors cost $59 per kw, and the variable capacitors will cost $65 per kw. the consultant charges 21% of the equipment costs to install the capacitors. because this project will reduce the demand for the electric utility, they are prepared to provide a one-time rebate of $42 per kw of reduced demand. what is the simple payback period for this project (in years)?