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June 2026 Bypass Plan at N MLK Crossing Revision 0 <br /> Hydraulic Design and Calculations <br /> The bypass system was designed for a peak flow of 1.36 MGD.An 8-inch DR21 high density polyethylene <br /> (HDPE)iron pipe size(IPS)line was selected based on hydraulic modeling of friction losses,minor losses, <br /> and static lift. Elevation data was sourced from the existing system GIS data and supplemented as needed <br /> from Google Earth. <br /> a. Pipe Capacity and Pressure Rating <br /> i. Maximum calculated pressure:35 psi <br /> ii. Minimum calculated pressure: 11 psi <br /> iii. DR21 HDPE allowable pressure rating: 100 psi <br /> b. Pump Sizing <br /> i. The bypass pump must provide a minimum Total Dynamic Head(TDH)of 80 feet, <br /> accounting for: <br /> 1. Static lift <br /> 2. Friction losses in 8-inch HDPE <br /> 3. Minor losses at bends,fittings,and discharge structures <br /> A redundant backup pump of equal capacity will be installed. <br /> c. Pressure Profile <br /> The pressure profile along the bypass alignment was evaluated to confirm that all mid-section pressures <br /> remain within allowable limits.The calculated pressures(11-35 psi)fall well below the DR21 rating. <br /> 3 Norfolk Southern <br />