Surface runoff can be calculated using the rational formula: Q $=$ KiA; where Q $=$ peak runoff

in units of ft$3/$s or m$3/$s$,$ i is the intensity of rainfall in units of cm$/$hr or inches$/$hr $($you must

convert units to m$/$hr or ft$/$hr$),$ and A is the watershed area in units of ft$2$ or m$2.$ The term K is

called a runoff coefficient in the rational formula. Let$$s assume that the rainfall intensity is

$7\mathrm{.}0$ cm$/$hr and the watershed area is $10$ km$2.$ The rain is falling on an urban area with a runoff

coefficient of $0\mathrm{.}95.$ What is the peak runoff from this storm in m$3/$s$?$