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OSTP Pressure Distribution <br />Minnesota PollutionDUNIVERSITY <br />Control Agency esign Worksheet OF MINNESOTA '��-- <br />Project ID: v 04.20.2016 <br />1. Media Bed Width: 10 ft <br />2. Minimum Number of Laterats in system/zone = Rounded up number of [(Media Bed Width - 4) : 3] + 1. <br />[( 10 - 4 ) : 31 + 1 = laterals Does not apply to at -grades <br />3. Designer Selected Number of Laterals: 3 laterals <br />Cannot be less than line 2 (accept in at -grades) <br />4. Select Perforation Spacing: 3.0 ft <br />5. Select Perforation Diameter Size: 7/32 in <br />l - - <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 E 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 1090 discharge variation. The <br />value is double with a center manifold. <br />Perforations Per Lateral = 20 Spaces + 1 = 21 7Perfs. Per Lateral <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 Total Number of Perf. <br />10. Select Type of Manifold Connection (End or Center): End ❑ Center <br />11. Select Lateral Diameter (See Table) : 2.00 in <br />Awrnum Number of Perforations Per Lateral to Gwrantee , iN Distharse Vanation <br />Inch Perforatons <br />7132 Iran Perforations <br />PerforateSpacing )Feet) <br />Pipe Diameter (Inches) <br />1 IA 1" 2 <br />3 <br />Perforation Spacing <br />Ifeetl <br />Pipe Diarneter (Inches) <br />> I Iv 11: 2 <br />3 <br />2 <br />10 13 18 30 <br />60 <br />2 <br />11 16 21 <br />34 <br />68 <br />21. <br />E 12 16 28 <br />54 <br />2s: <br />10 14 20 <br />32 <br />64 <br />3 <br />9 it 1 16 25 <br />52 <br />3 <br />9 14 19 <br />30 <br />60 <br />316 Inch Perforations <br />118 Inch Perforatsois <br />Perforatrfln Spaang (Feet) <br />Pipe Diameter (Inches) <br />Perforation Spacir@ <br />(feet) <br />Pipe D;arneter (Inches) <br />1 11+ 11; 2 3 <br />t 1 �: 11:t <br />3 <br />2 <br />12 18 26 46 <br />87 <br />2 <br />21 33 44 <br />74 <br />149 <br />21: <br />12 17 24 40 <br />80 <br />2t <br />20 30 41 <br />69 <br />135 <br />3 <br />12 16 22 37 <br />75 <br />3 <br />20 29 38 <br />64 <br />128 <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 Total Number of Perf. <br />10. Select Type of Manifold Connection (End or Center): End ❑ Center <br />11. Select Lateral Diameter (See Table) : 2.00 in <br />