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OSTP Pressure Distribution <br /> Minnesota Pollution Design Worksheet UNIVERSITY <br /> Control Agency ()I' Ml N N ESum <br /> Project ID: 22052 v 04.06.2017 <br /> 1. Media Bed Width: 16 ft <br /> 2. Minimum Number of Laterals in system/zone = Rounded up number of [(Media Bed Width - 4) _ 3] + 1. <br /> [( 16 - 4 ) _ 31 + 1 = laterals Does not apply to at-grades <br /> 3. Designer Selected Number of Laterals: laterals <br /> Cannot be less than line 2 (accept in at-Qrodes) <br /> 4. Select Perforation Spacing: 3.0 ft <br /> 5. Select Perforation Diameter Size: 3/16 in <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 =E=Spaces + 1 = 21 Perfs. Per Lateral <br /> Aix--an Ww*er t�F+elrz a*a-s Fe- Lareri h C,ia-rti- V,'Kk <br /> '.Imra Fe t ravens ' .12 <br /> FIFt$(1�i►RkIt' s u:'"e:� :e'+::'tIi1II+�:ilCl'+� .� <br /> FipeDiarreterilwhrt 41 <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. = 105 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 />