Calculate the water balance coefficients for a semiarid climate with the following data:
mean annual precipitation P = 450 mm,
mean annual runoff Q = 43 mm,
mean annual advective moisture A = 850 mm,
length of the control volume L = 1000 km;
moisture content of the atmospheric column W = 15 mm; and
mean velocity of the advected moisture U = 300 km/day.