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GOOD' OSTP Pressure Distribution <br />Minnesota Pollution Design Worksheet UNIVERSITY <br />/l T �/ri ATATT T�l1TA � \� <br />Lontrol A9enCy vi lrli l\ Al L1JV A n <br />Project ID: O7142O17Soil v 04.06.2017 <br />1. Media Bed Width: 10 ft <br />2. Minimum Number of Laterals in system/zone = Rounded up number of [(Media Bed Width - 4) : 3] + 1. <br />[( 10 - 4) : 3] + 1 = Qlaterals Does not apply to at -grades <br />3. Designer Selected Number of Laterals: Qlaterals <br />Cannot be less than line 2 (accept in at -grades) <br />4. Select Perforation Spacing: 2.5 ft <br />5. Select Perforation Diameter Size: 3/16 in <br />er;M. <br />6. Length of Laterals = Media Bed Length - 2 Feet. "° <br />30 - 2ft = 28 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 28 ft - 2.5 ft = 11 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 = 11 Spaces + 1 = 12 Perfs. Per Lateral <br />9. Total Number of Perforations equals the Number of Perforations per Lateral multiplied by the Number of <br />Perforated Laterals. <br />12 Perf. Per Lat. X Number of Perf. Lat. = 36 Total Number of Perf. <br />10. Select Type of Manifold Connection (End or Center): End <br />11. Select Lateral Diameter (See Table) : 1.50 in <br />Maximum Number of Perforations Per Lateral to Guarantee (10% Discharge Variation <br />'!,inch Perforations <br />7/32 Inch Perforations <br />Perforation Spacing (Feet) <br />Pipe Diameter (Inches) <br />Perforation Spacing <br />(Feet} <br />Pipe Diameter (Inched <br />I 1v. 1t2 2 3 <br />I IV. 1t2 2 <br />3 <br />2 <br />10 <br />13 18 30 <br />60 <br />2 <br />11 16 21 <br />34 <br />68 <br />2t2 <br />8 <br />11 16 28 <br />54 <br />21,1 <br />10 14 20 <br />31 <br />64 <br />3 <br />8 <br />12 16 25 <br />52 <br />3 <br />9 14 19 <br />30 <br />60 <br />116 Inch Perforations <br />1 "8 Inch Perfofations <br />Perforation Spacing (Feet) <br />Pipe Diameter Ilnches) <br />Perforation Spacing <br />(Feet) <br />Pipe Diameter (Inches) <br />1 114 1t2 2 3 <br />1 1V: 112 2 <br />3 <br />2 <br />12 <br />18 26 46 <br />87 <br />1 <br />21 33 44 <br />74 <br />149 <br />21t <br />12 <br />17 24 40 <br />80 <br />tar <br />20 30 41 <br />69 <br />135 <br />3 <br />1 12 <br />16 22 37 <br />75 <br />3 <br />20 29 38 <br />64 <br />118 <br />9. Total Number of Perforations equals the Number of Perforations per Lateral multiplied by the Number of <br />Perforated Laterals. <br />12 Perf. Per Lat. X Number of Perf. Lat. = 36 Total Number of Perf. <br />10. Select Type of Manifold Connection (End or Center): End <br />11. Select Lateral Diameter (See Table) : 1.50 in <br />