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<br />q inches/hour <br /> <br /> <br />c <br /> <br />m ---r- G-..j <br /> <br />t hours <br /> <br />m = time from commencement of runoff to peak discharge rate, <br />measured on the negative side of the origin. <br /> <br />C = center of gravity of hydrograph. <br /> <br />G = time between center of mass of runoff and peak discharge <br />rate. <br /> <br />q = discharge rate from watershed in inches per hour; discharge <br />rates at the outlet have been divided by the area of the <br />watershed and converted to depth per unit time. <br /> <br />~ = peak rate of discharge; converted to inches per hour as <br />described above. <br />.. <br /> <br />W =J q .dt = total runoff vol~~e in inches: consistent <br />- with the above treatment of q and q , division by <br />. 0 vOlume <br />watershed area has reduced the unlts to = length. <br />area <br />Nevertheless, the popular usage of the term <br />"hydrograph volume" has been retained. <br /> <br />Fig. 1 <br /> <br />Mathematical model of flood hydrograph. <br />