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l� I <br /> I .• <br /> 1 r'1 <br /> OSTP Pressure Distribution 4 <br /> Minnesota Pollution Design Worksheet UNIVERSITY <br /> Control Agency OF MINNESOTA � '� '�-^��:^' <br /> Project ID: v 06.12.13 <br /> I <br /> 1. Media Bed Width: 10 ft <br /> I <br /> 2. Minimum Number of Laterals in system/zone= Rouded up number of[(Media Bed Width - 4) : 3] + 1. <br /> ( 10 <br /> -4 ) + 1 = �3�laterals Does not apply to at-grades <br /> 3. Designer Selected Number of Laterals: laterals <br /> Cannot be less than line 2 (occept in ot-vades) ----- <br /> Y <br /> 4. Select Perforation Spacing: 3.0 ft _ <br /> 5. Select Perforation Diameter Size: 7/32 in <br /> i <br /> 6. Length of Laterals =Media Bed Length - 2 Feet. <br /> 63 - 2ft = 61 ft Perforation can not be closer then 1 foot from edge. <br /> 7 Determine the Number of Perforation Spaces. Divide the Length of Laterals by the Perforation Spacing <br /> and round down to the nearest whole number. <br /> Number of Perforation Spaces 61 ft �ft = 20 Spaces <br /> Number of Perforations per Lateral is equal to 1.0 plus the Number of Perforation Spaces. Check table <br /> 8. below to verify the number of perforations per lateral guarantees less than a 10%discharge variation. The <br /> value is double with a center manifold. <br /> Perforations Per Lateral = 20 Spaces + 1 = 21 Perfs. Per Lateral <br /> i <br /> Maximum Nw ber of Perforations Per Lateral to Guarantee c 10%Discharge Variation <br /> V.inch Petfora6ons 7/32 inch Perforations <br /> Pipe Diameter(Inches) Perforation Spacing Pipe Diameter(Inches) <br /> Perforation Spacing(Feet) 1 114 tai 2 3 (Feet) 1 1S4 In 2 3 <br /> 2 110 13 18 30 611 ? 11 16 V 34 68 <br /> 21t 8 12 16 28 54 2%4 10 14 20 32 64 <br /> 3 8 12 16 25 52 3 9 14 119 30 60 <br /> 3/16 Inch Perforations 1/8 Inch Perforations <br /> Pipe Diameter(inches) Perforation Spacing Pipe Diameter(Inches) <br /> Perforation Spacing(Feet) 1 11& IV', 2 3 (Feet) 1 114 114 2 3 <br /> 2 12 18 26 46 87 2 21 33 44 74 149 <br /> Di 12 17 24 40 80 2" 20 130 41 69 135 <br /> 3 12 16 22 37 75 3 20 129 38 64 1128 <br /> 9• Total Number of Perforations equals the Number of Perforations per Lateral multiplied by the Number of <br /> Perforated Laterals. <br /> 21 Perf. Per Lat. X Number of Perf. Lat. = 63 j Total Number of Perf. <br /> i <br /> 10. Select Type of Manifold Connection (End or Center): Q End ❑ Center <br /> 11. Select Lateral Diameter(See Table): 2.00 in <br />