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The orifice equation is: <br />Where <br />D=(38.55(Q)/(h)"2)in <br />D= orifice dia. (inchs) <br />Q= flow rate (cfs) <br />h=head (ft) <br />Page 12 of 29 <br />Therefore <br />D = (38.55(0.1542)/(1.5)1n)ir_ <br />D=2.1" <br />The riser pipe in the flow splitter is sized to allow the 100 year developed flow to spill <br />over the top and stay within the catch basin. A 12-inch riser with convey 1.91 cfs with a <br />water depth of 0.37 feet (see attached riser inflow curve figure 5.3.4H) which confirnis <br />adequate water depth in the CB to convey the flow over the riser. See flow splitter detail <br />on the plans. <br />