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111CR <br /> ENGINEERING <br /> MCR Job #: 17-074 April 1411, 2020 <br /> Nile Garden Elementary Pressure Distribution Design <br /> 1. Select Lateral Length: <br /> • Design: Use 50' lateral lengths (max) <br /> 2. Select Hole Diameter &Spacing For Laterals: <br /> • Design: Use 1/4" holes @ 5' spacing <br /> 3. Select Lateral Diameter: <br /> • Design: '/4" holes, 5' Spacing, 50' lateral <br /> • Figure 7-28: Use 1 '/4" diameter laterals <br /> 4. Calculate Lateral Discharge Rate: <br /> • Design: Maintain 3' head with '/4" holes <br /> • Table 7-13: 1.28gpm/hole <br /> • Calculation: 50/5 = 10 holes/lateral * 1.28gpm/hole = 12.8gpm/lateral <br /> 5. Select Manifold Size: <br /> • Design: 8 laterals @ 12' apart for a 42' manifold length @ 13gpm/lateral <br /> • Figure 7-29: Use 3" manifold <br /> 6. Determine Minimum Dose Volume: <br /> • Design: 1 '/4" laterals @ 50' <br /> • Caclulation: pipe volume = Tr(1 %"/12)2/4 * 50' * 7.48gal/cf= 3.2 gallons <br /> • Figure 7-30 : 250 gallons <br /> 7. Determine Minimum Discharge Rate: <br /> • Calculation: 8 laterals * 13gpm/lateral = 104 gpm <br /> 8. Select Proper Pump: <br /> • Use FLYGT NP 3085 SH 3 (see attached pump design calculations) <br /> • <br />