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<br />Criticali-depth Method Formula <br /> <br />Q = g 1/2 W D 3/2 <br /> <br /> <br />Where: <br />Q = Discharge <br />g = Acceleration of gravity = 32.2 ft/s2 'EVa =S-;6"7 <br />W = Cross-section width <br />D = Hydraulic depth of flow <br /> <br />Similar to the equation for a sharp-crested weir <br />