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� � OSTP Pressure Distribution <br /> Minnesota Pollution Design Worksheet UNIVERSITY . --� � , ; <br /> C o n t r o i A g e n c y O F M I N N E S O T A "�--1\_' <br /> Project ID: v 06.12.13 <br /> 1. Media Bed Width: �0 ft <br /> 2. Minimum Number of Laterats in system/zone = Rouded up number of [(Media Bed Width - 4) = 3] + 1. <br /> ( 10 - 4 ) + � _ � 3�laterals Does not apply to at-grodes <br /> �— <br /> 3. Designer Setected Number of Latero(s: C�taterats <br /> Cannot be(ess than line 2 (accept in at-Qrades) - _ <br /> 4. Select Perforotion Spacing: . . , ' <br /> 3.0 ft <br /> 5. Select Perfororion Diameter Size: 7/32 in - ' _ 44 ;_-- <br /> �,.ak <br /> 6. Length of Latera(s =Media Bed Length - 2 Feet. <br /> 63 - 2ft = 61 ft Perforation can not be closer then 1 foot from edge. <br /> � 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 Perforotion Spoces 61 ft = �3 �ft = 20 Spaces <br /> Number of Perforotions per Laterol is equal to 1.0 plus the Number of Perforotion Spaces. Check table <br /> 8. betow to verify the number of perforations per lateral guarantees less than a 10�discharge variation. The <br /> value is doubte with a center manifold. <br /> Perforations Per Lotera( = 20 Spaces + 1 = 21 Perfs. Per Lateral <br /> Maxim�Number of Perforations Per latc�ral to Guarantee<1(H6 piuharge Variatian <br /> �'+Inc. Pertorat�ons 7i321�c�Perforations <br /> Perforat�on Spacing IFeek) �Pe Diameter(Irxhes) Fe+foratian Spacir� Pipe D+ameter(fnct�es! <br /> ! iV� 1t2 2 3 (feet► t tti: iv� 2 3 <br /> 2 10 13 18 30 b0 2 11 16 21 34 6$ <br /> Z�� 8 12 16 28 54 2:`: tp 14 20 32 64 <br /> 3 8 t2 16 25 52 3 9 14 19 30 b4 <br /> 3%16 inch Perarations 1,'S(rxh Perforations <br /> Pipe Diameter{Irxhes) Perfaration Spacir� Pipe Diameter�Inches) <br /> Perforation Spa�ng(Feet) <br /> t 1y: 1i: 2 3 (I�eet) 1 1Y.� f�`: 2 3 <br /> 2 11 18 26 4b B7 2 2i 33 44 74 ia9 <br /> 7i� 12 17 24 40 84 2<< 20 3Q 4t 69 135 <br /> 3 12 16 21 31 75 3 2Q 29 38 6d 128 <br /> 9• Total Number of Perfororions equals the Number of Perforations per Lvtero( multiplied by the Number of <br /> Perforated Laterols. <br /> 21 Perf. Per Lat. X �Number of Perf. Lat. = 63 Totat Number of Perf. <br /> 10. Select Type of Manifold Connection (End or Center): � End ❑ center <br /> 11. Select Latera( Diometer(See Table): 2.00 in <br />