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OSTP Pressure Distribution " <br /> UNIVERSITY "fit <br /> Minnesota Pollution Design Worksheet OF MINNESOTA .� <br /> Control Agency `Z, <br /> Project ID: v 12.08.06 <br /> 1. Media Bed Width: 10 ft <br /> 2. Minimum Number of Laterals in system/zone= [(Media Bed Width(Line1)-4):3]+1 round up to the neareast whole number+ 1. <br /> ( 10 -4)+ 1 = 3 laterals <br /> 3. Designer Selected Number of Laterals: 3 laterals <br /> Cannot be less than line 2(accept in at-grades) <br /> in�r...,ces.bo <br /> 4. Select Perforation Spacing: 3.0 ft -- r - <br /> 12"' - ` ' 12 Soil cover <br /> Gcwtr>,tilc <br /> 5. Select Perforation Diameter Size: 7/32 in Minimnn / <br /> V.'pcAaTtions sP•�ceA 3•aPotl _ <br /> 6. Length of Laterals =Media Bed Length-2 Feet. 1 6-o/ruck <br /> 1•erlorutlan sizing:'/:,""to'h 1•ertoration spacing:1'to 3' <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 (Line 6)by the Perforation Spacing (Line 4)and <br /> round down to the nearest whole number. <br /> Number of Perforation Spaces = 61 ft 3 ft = 20 Spaces <br /> Number of Perforations per Lateral is equal to 1.0 plus the Number of Perforation Spaces (Line 7). Check table below to verify the <br /> 8' number of perforations per lateral guarantees less than a 10%discharge variation. The value is double with a center manifold. <br /> Perforations Per Lateral = 20 Spaces + 1 = 21 Perfs. Per Lateral <br /> Maximum Number of Perforations Per Lateral to Guarantee<10%Discharge Variation <br /> V,Inch Perforations 7132 Inch Perforations <br /> Pipe Diameter(Inches) Perforation Spacing Pipe Diameter(Inches) <br /> Perforation Spacing(Feet) 1 11/4 134 2 3 (Feet) 1 114 nth 2 3 <br /> 2 10 13 18 30 60 2 11 16 21 34 68 <br /> 21 8 12 16 28 54 21 10 14 20 32 64 <br /> 3 8 12 16 25 I 52 3 9 14 19 30 60 <br /> 3.16 Inch Perforations 1/8 Inch Perforations <br /> Pipe Diameter(Inches) Perforation Spacing Pipe Diameter(Inches) <br /> Perforation Spacing(Feet) <br /> 1 11: 114 2 3 (Feet) 1 11 11/2. 2 3 <br /> 2 12 18 26 46 87 2 21 33 44 74 149 <br /> 214 12 17 24 40 80 21 20 30 41 69 135 <br /> 3 12 16 22 37 75 3 20 29 38 64 128 <br /> 9. Total Number of Perforations equals the Number of Perforations per Lateral (Line 8)multiplied by the Number of <br /> Perforated Laterals (Line 3). <br /> 21 Perf. Per Lateral X 3 Number of Perf. Laterals = 63 Total Number of Perf. <br /> 10. Select Type of Manifold Connection (End or Center): E End ❑ Center <br /> 11. Select Lateral Diameter(See Table): 2.00 in <br />