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� �fi4 OSTP Pressure Distribution a,�� <br /> MinnesotaPollution Desi n Worksheet UNIVERSITY � <br /> ControlA ency � OF MINNESOTA ''t.�,,� <br /> ProjectlD: v 07.14.15 <br /> 1. Media Bed Width: �� ft <br /> 2. Minimum Number of Laterals in system/zone = Rounded up number of [(Media Bed Width - 4) = 3] + 1. <br /> � �Q " 4 � + � - �3 �taterats Does not opp(y to ot-grodes <br /> 3. Designer Selected Number of Laterols: C�taterals <br /> Cannot be less than line 2 (accept in at-Qrades) <br /> 4. Select Perjoration Spacing: 3.0 ft , - „Y,...�.�.- . ' <br /> �. h �ww.V �{��t 1 ]'M'a\ ��-'f].. <br /> 5. Select Perforation Diometer Size: 7/32 in = ' _ --- <br /> _ � _- --__- -- <br /> 6. Length of Laterols = Media Bed Len�th - 2 Feet. <br /> 63 - 2ft = 61 ft Perforation can not be doser then 1 foot from edge. <br /> � Determine the Number of PerforQtion Spotes. Divide the Length of toterats by the Perforation Spocing <br /> and round down to the nearest whole number. <br /> Number of Perforation Spaces 61 ft = ��ft = 20 Spaces <br /> Number of Perforations per LQtera( is equat to 1.0 plus the Number of Perforotion SpQces. Check table <br /> 8. below to verify the number of perforations per tateral guarantees less than a 10% discharge variation. The <br /> vatue is double with a center manifold. <br /> Perforations Per tQterQ! = 20 Spaces + 1 = 21 Perfs. Per Lateral <br /> MaxinMm Nu�of Perforatio�ns PK taRlnl to Guu�tkt�e<10%Disdfiryc V�riiticn <br /> '.I P or�twns 1132 Irxh Perfor�tiwu <br /> Perfonkion �De��(lnches) Perfontio�Spxi� Pipe Diametef(kxhrsl <br /> SpxnylFeet) � 1� 1� 1 3 (Feeti t tw tvt 2 3 <br /> 2 10 13 td 30 60 2 it 16 21 34 6a <br /> � d 11 16 2a 54 2�: 10 1� 2Q 32 6� <br /> 3 1 11 1b 15 52 3 9 14 19 30 60 <br /> 3;16 h�ch Prrforatio�s 1'S Inch Perfor�taoru <br /> Perfor�tion RPe Di�rneter(Mxhes! Perfor�tia►Sp�ci^� Pipe Di�rtKtef(Mchesl <br /> Spxx►glFeet) t ta tr, 1 3 �Feet) 1 t� 1�; 2 3 <br /> 2 tt 1a 16 16 a7 1 21 33 M 74 1!9 <br /> 2r, t1 t7 14 �0 QO 2�: 20 30 �t 69 135 <br /> 3 t2 16 22 37 7S 3 20 2y 3� �4 1� <br /> g• Toto( Number of Perforations equats the Number of Perforations per Loterof multiplied by the Number of <br /> PerforQted Loterats. <br /> 21 Perf. Per Lat. X ��Number of Perf. Lat. = 63 Totat Number of Perf. <br /> 10. Setect Type of Manifotd Connection (End or Center): � End ❑ center <br /> 11. Select Latera! Diameter (See Tab(e): 2.00 in <br />