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Design : Upturned Elbow and Orifices <br /> Design Approach: <br /> • Add upturned elbow with top rim equal to bottom of filtration media. <br /> • This will induce some saturation of media at all flow rates, including baseflow <br /> • Hydraulics at flow rates greater than 8 cfs will not be impacted -the HGL in outlet structure manholes in manholes will be <br /> higher than rim <br /> • Other designs could be used such as using an additional weir instead of upturned elbow <br /> • Add orifice to bottom of elbows. Goals of orifice: <br /> • Allow drain-down if flow into system stops <br /> • Induce saturation of—1 inch of media when water is at top of upturned elbow at baseflows rates of 0.25 cfs per media bed <br /> diEw Asg� <br /> Orifice elevation 340.71 ' 337.8 <br /> Top of upturned elbow 343.5 343.5 <br /> Head (ft) 2.79 5.70 <br /> Orifice diameter (inch) 2.375 2 <br /> Orifice flow rate (cfs) 0.255 0.259 <br /> Use of a standard 2" orifice in each bed would be OK. <br />