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� OSTP Pressure Distribution ::,�,, <br /> Minnesota Pollution Desi n UNIVERSITY � <br /> g Worksheet OF MINNESOTA �'�`��'' <br /> Control A ency r <br /> Project ID: v 06.12.13 <br /> 1. Media Bed Width: 10 ft <br /> 2. Minimum Number of Laterals in system/zone = Rouded up number of [(Media Bed Width - 4) : 3] + 1. <br /> ( 10 - 4 ) + � _ �laterals Does not opp(y to at-grades <br /> 3. Designer Selected Number of Laterals: �laterals <br /> Cannot be (ess than (ine 2 (accept in at-Qrades) - � <br /> 4. Select Perforation Spocing: 3.0 ft � - ��, ����������• � __ t_ - <br /> M�i��inum <br /> ���vll'.�I..��� 1"!"ol�ntk �j� . <br /> 5. Select Perforation Diameter Size: 1/4 in -- - <br /> �� _— !�_.�.. __ _ - - <br /> 6. Length of Lotera(s = Media Bed Length - 2 Feet. <br /> 63 - 2ft = 61 ft Perforation can not be closer then 1 foot from edge. <br /> 7 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 = ��ft = 20 Spaces <br /> Number of Perforations per Latero( is equal to 1.0 plus the Number of Perforation Spoces. 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 /> Perforotions Per Lateral = 20 Spaces + 1 = 21 Perfs. Per Laterat <br /> Maximum Number of Perfaadons Per Lateral W GuaraMee<10%DiscM�rge Variation <br /> !.Inc P orabons 7/32 Inch Pe+forations <br /> Perfaration AP�Diameter(irxhesl Perfaration Spaci�g Pipe Diameter(Inchesl <br /> Spacing iFeet) i 114 1r, 2 3 (Feetl 1 1/b 1v: 2 3 <br /> Z 10 13 18 30 b0 2 11 16 21 34 6E <br /> 2� 8 12 16 28 54 2�: 10 14 20 32 64 <br /> 3 d 12 16 25 52 3 4 14 19 30 60 <br /> 3�'16 Irxh Perforatioru i'8 Inch Perforations <br /> Pipe Diameter Ilrxhesi Perforation Spacing Pipe Diameter pr►chesl <br /> Perforation Spacing iFeetl <br /> 1 i1b tv: 2 3 (Feetl t 1K, 1K 2 3 <br /> 2 12 ta 2b �b a7 2 2t 33 44 7� 1�9 <br /> Z�' �2 �� Za 44 80 Z�: 20 30 41 69 135 <br /> 3 1T ib 22 37 15 3 20 29 38 b4 128 <br /> 9• Totol Number of Perforotions equals the Number of Perforations per Latera( multiplied by the Number of <br /> Perforated Latera(s. <br /> 21 Perf. Per Lat. X ��Number of Perf. Lat. = 63 Total Number of Perf. <br /> 10. Select Type of Manifo(d Connection (End or Center): � End ❑ Center <br /> 11. Se(ect Latera( Diameter (See Tabfe): 2.00 in <br /> I <br />