If intensity of rainfall in cm per hour is I, percentage coefficient of run-off is P, area of catchment in
square kilometres is A, the total run-off Q, is given by
(A) Q = 1.758 × 102
× API
(B) Q = 2.758 × 102
× API
(C) Q = 2.758 × 103
× API
(D) Q = 2.758 × 103
× A/PI