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<br />Equation 1 reduces to <br /> <br />Q 2. W <br />Y2 = ( me2 i 7 (....s) K, <br />Y1 Ornel . ;V'C2 <br /> <br />(2) <br /> <br />A typical application of la would be to evaluate the effect <br />of piers in the main channel when there is over bank flow. <br /> <br />CASE lb. <br /> <br />Case lb involves overbank flow with out any contraction of <br />the main channel (even by piers). In this case <br /> <br />Qme 1 < Qme2 <br /> <br />Qmc2 <br /> <br />= total flow going through the bridge. <br />plus Qoverbank less any flow going over <br />through a relief bridge or otherwise <br />main bridge, (Qt - Qb ) <br />ypass <br />= We2 <br /> <br />It eauals Q_, <br />. "c. <br />the road,,ray, <br />bypassing the <br /> <br />. <br /> <br />We' <br /> <br />n1 = n2 <br /> <br />Then equation 1 reduces to <br /> <br />Yz = ( Qme2) 4 <br />Y1 Omel <br /> <br />(3) <br /> <br />... <br /> <br />39 <br />