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. OSTP Non-Level Pressure Distribution <br /> UNIVERSITY ; <br /> Minnesota Pollution Design Worksheet OF MINNESOTA �''� - - <br /> Control A enc ,,�,��;. <br /> 7. Calculate Flow in Gallons Per Minute for Lateral 1 <br /> A. Select Perforotion Spacins: 2.0 feet Perforation Discharge(GPM) <br /> Perforation Diameter <br /> B. Length of Latera(s =Length of STA(Line 1) -2 Feet Head (ft) ,�8 ,��6 ,�3Z ��� <br /> 25 -2 ft= 23 �,p' 0.18 0.41 0.56 0.74 <br /> 1.5 0.22 0.51 0.69 0.9 <br /> �• Number of Perforation Spaces =Divide the Length of Lateral 1 (7.B)by the 2.Oe o.26 0.59 o.so i.o4 <br /> Perforation Spacing(Line 10)and round down to the nearest whole number. 2.5 0.29 0.65 0.89 1.17 <br /> Check Table II to ensure the maximum number of perforations is not exceeded. 3.0 0.32 0.72 0.98 �.28 <br /> 4.0 0.37 0.83 1.13 1.47 <br /> 23 fci 2.0 fc= 11 spaces s.o o.a� 0.93 �.zb 1.65 <br /> a: Use 1.0 for dwetlings using 1/4 inch or 3/16 inch <br /> D. Seled Type of Manifold Connection (End or Center): �end ❑Center hotes. <br /> E. Number of Perforations=Number of Perforotion Spaces(Line 11)+ �, b: Use 2.0 for dwellings using 1/8 inch holes;or,for <br /> � other establishments using 1/4 inch or 3/16 inch <br /> 11 Spaces+1 = 12 hotes. <br /> F. Flow Rate for Latera( 1 =Number of Perforations X F(ow Rate Per Hole for Laterol � c: Use 5.0 for other estabtishments using 1/8 inch <br /> perforations and media filters. <br /> 12 X 0.74 = 8.8 GPM for Laterat 1 <br /> 8. Calculate the Gallons Per Minute Per Foot for Lateral 1. This value will then be used to make <br /> sure that the gallons per minute per foot is equivalent in each tateral <br /> Gatlons Per Length= Flow Rate for Lateral 1 divided by Length of Lateral 1 <br /> 8•8 - 23 = 0.38 GPM/Foot <br /> Maximum N�m�r of PerFc--ations PeF Lac�al to Guarantee•1�Discharge Variation <br /> �Inch Fertorar��s 7r32 lnch Petfaration; <br /> Fip>_-Char-.eLer 1lnchzsl Pe�foration Sp�ci� Fi�Cnasrse:er(.Inchesl <br /> pef'F;�r3Ck�'l S�'orn�iFe?CI - <br /> e �tS �;S <br /> L , (fEEYt f 1'.. tt� � ?, <br /> L 10 13 18 30 60 2 11 16 2t 3�t 68 <br /> z�� ° f2 �6 28 5a 2ti: in �� 20 3Y 6�i <br /> 3 � 12 16 25 52 3 4 1-i 19 3!1 6C1 <br /> 7 '�6 lnch Per."oratiorts f.'g Inch Ferivrat•ons <br /> Fipe Diamet-rr tlrxhesl Perfaratio�Spxing Pipe Chameter IlnchFz} <br /> Perfurat��Sp�cn;;IFeetl <br /> 1 1,�; tt: Z = iFep:l t t'•: tti: <br /> [ 3 <br /> Z 12 1E Zb 46 67 2 21 33 -i-1 74 1�9 <br /> Z'� 12 i 17 24 40 8Q �: 2Q 3�J 41 69 135 <br /> 3 i 16 22 37 75 3 2fl 29 3R b; 128 <br /> 9. Balance flows for other lateral lengths,spacing, and size. <br /> If you end up with large perforation spacing(3'is max) lower the initial spacing for Lateral 1 (Line 7.A)or the perforation size (Line 6) <br /> Lateral 2 GPM=Length of Lateral X Gallons Per Minute Per Foot(Line 8) <br /> 23 ft X 0.38 GPM/ft= $.$ GPM <br /> Number of Perforations=GPM/Flow Rate for Lateral 2(Line 6.2) Check Table to ensure the maximum number of perforations is not <br /> exceeded. <br /> 8.8 .- 1.09 = �perforations Select Type of Manifold Connection (End or Center): <br /> Spacing=(Length of Lateral)/(Number of Perforations-1) DEnd ❑center <br /> ( 23 ) : ( �$ Perforations-1) = 3,2 ft <br />