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� � OSTP Pressure Distribution <br /> MlnnesotaPollution Desi n Worksheet UNIVERSITY <br /> ConuolAgency � OF MINNESOTA 'L� <br /> ProjectlD: v 04.20.2016 <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 = �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-Qrades) „„ ,�,;,,, <br /> 4. Select Perforation Spacing: 3.0 ft ,°:; '�=Y = - <br /> i.- <br /> 5. Select Perforation Diameter Size: 7/32 in ` --'�"�"�""`""`�"'�"� �"'"" r '�� <br /> -r„� <br /> 6. Length of Laterals =Media Bed Length -2 Feet. """"°"°""'��""`� """""°"'""' �'�'"'� <br /> 63 - 2ft = 61 ft Perforation can not be ctoser 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 Spaces 61 ft : �ft = 20 Spaces <br /> Number of Perforations per Laterol 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 = 20 Spaces + 1 = 21 perfs. Per Lateral <br /> Ma�dmim Nunber d Perfarations Per Lateral6o Guarantee<10l1 Dischuse Variatian � <br /> /. P aat�ons 7/32 Inth PerFaatiau <br /> Pipe Diameter(incfKs) PerForation Spaci� ��(�) <br /> ����(F�) 1 tii iK 2 3 �F�) 1 1Si 1H 1 3 <br /> 1 10 13 1e 30 60 2 ti 16 21 34 68 <br /> � a 12 16 2a 54 Y1rt 10 14 20 32 W <br /> 3 � 11 1b 25 52 3 9 1� 19 30 60 <br /> 3N6 hxh PerForatia►s 1/S Inch Perforations <br /> �Pe�n�) PetfotaEion Spacing P�e Oiame�tet(Inthes) <br /> P����B�F�) 1 1li tYt 2 3 (Feet) f 1�f tYe 2 3 <br /> t 12 ta 26 �d 87 2 21 33 44 7� 149 <br /> 2l4 12 17 24 40 80 ZS4 ?A 30 41 69 135 <br /> 3 12 16 Z2 37 15 3 20 29 38 N 138 <br /> 9• Total Number of Perforations equals the Number of Perforations per Latera( 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 />