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OSTP Pressure Distribution <br /> Minnesota Poliution Desi n Worksheet uNIVERSITY <br /> Control A ency � OF MINNESOTA �,,,� <br /> ProjectlD: v 07.14.15 <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 ) + � _ ��laterats Does not opply to at-grades <br /> 3. Designer Selected Number of Laterals: ��taterals <br /> Cannot be less than (ine 2 (accept in at-Qrades) ��,w�,,,;N " <br /> 4. Select Perforotion Spacing 3.0 ft ;�:. . . - . ;�'°�:���.w.: .. --� . <br /> Mi�wrw�� <br /> �:p,.�l..rn�wm�Pw�.l i'.Ywt 1'.)'M�Mk �' �_• <br /> 5. Select Perforation Diameter Size: 7/32 in - �-o,.�, <br /> �„�a�„w..� ...�w��, . ��W,• <br /> b. length of Laterols =Media Bed Length - 2 Feet. <br /> 63 - 2ft = 61 ft Perforation cQn not be c(oser then 1 foot from edge. <br /> � Determine the Number of Perforation Spaces. Divide the Length of Laterols by the Perforation Spacing <br /> and round down to the nearest whole number. <br /> Number of PerforQtion Spoces 61 ft = ��ft = 20 Spaces <br /> Number of Perforotions per Lotera( 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 doubte with a center manifold. <br /> Perforations Per Loteral = 20 Spaces + 1 = 21 Perfs. Per Lateral <br /> Mazi�m N�xnber af Pprfarad�o�s Per t.�tetal 0o Guarirtee<f0li Di�e Yyi�tion <br /> !.f P orabons 7/31 Md�Perforations <br /> Perforation Spacmg IFeetl �Dian�eter Ckxhes) Perforadon Spacing Piqe Di�meter IMcF�es1 <br /> 1 11t tve 2 3 (Feet) 1 11i 11h 2 3 <br /> 2 10 13 ts 30 b0 2 14 16 21 34 6a <br /> 2� 8 t2 16 18 54 1�t 10 1� 10 32 64 <br /> 3 8 t2 16 25 52 3 9 14 19 30 6d <br /> 3!f 6 ItKh Perforatia�ns 1/8 Inch Perforations <br /> Perfontion Spac�ng IFeet) �Diart�eter(lnthes) Petforation Spxing Pipe Di�meter(Intl�es! <br /> t 11� 11h 2 3 IFeet) 1 11i 11h 2 3 <br /> 1 t2 1E 26 �46 a1 2 21 33 M 7� t49 <br /> 2� a1 �� Z4 �0 d0 2�t 20 30 41 69 135 <br /> 3 12 f6 21 37 75 3 Zp ty 3d 64 12E <br /> 9• Tota(Number of Perforations equals the Number of Perforations per Latera! multiplied by the Number of <br /> Perforated Loterals. <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 Latera( Diameter (See Table): 2.00 in <br />