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OSTP Pressure Distribution �;�,; <br /> Minnesota Pollution Desi n Worksheet UNIVERSITY ''�� <br /> Controi A enc � OF MINNES � \� <br /> g y OTA �.., � <br /> Project ID: v 06.12.13 <br /> 1. Media Bed Width: �� 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 apply to at-grades <br /> 3. Designer Selected Number of Loterals: � 3 �laterals <br /> Cannot be less than line 2 (accept in at-Qrades) - <br /> 4. Select Perforotion Spacing: 3.0 ft �- � � ������•�-•• - __ __ <br /> w��l.�� ��11 M111 �I��rk I!" <br /> . .t�..t�l i i <br /> i�n •t__ <br /> i�'1 .�1��.����Ir.i� '.��.��1 /.. <br /> 5. Select Perforation Diameter Size: 1/4 in = �,,. ' _ <br /> , ,,.,.�,.,.,,,,�,,.,, <br /> 6. Length of Lotera(s = Media Bed Length - 2 Feet. <br /> 50 - 2ft = 48 ft Perforation can not be Noser 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 48 ft = � 3 �ft = 16 Spaces <br /> Number of Perforations per Lotero( 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 Latera( = 16 Spaces + 1 = 17 Perfs. Per Lateral <br /> Maximum Nurtibef of Perforatso�s Per Lateral co Guanntee<10%D'escha►ge Yariation <br /> !*E"� P °rah°^5 7/311nch Perforations <br /> Perforation Spacing IFeetl �����(lnthesl Perfofadon Spacing Pipe Diameter(Inches) <br /> t 1S4 1K 2 3 (Feet1 1 1�6 1ti4 2 3 <br /> 2 1Q 13 18 30 60 2 11 16 21 3� 68 <br /> 2� 8 1I 16 18 54 2�: 10 14 20 32 64 <br /> 3 8 12 ib 25 52 3 9 14 19 30 60 <br /> 3'161nch Pertorations t:'8 Inch Perforations <br /> Pipe Diameter(lnches) Perforation Pi Dia <br /> Perforatirsn Spacing(Feet� ��9 Pe "►ete�f�nches) <br /> I 114 1v: 2 3 (FeetM 1 11� 1t2 1 3 <br /> 2 11 18 26 46 87 2 21 33 4t 14 149 <br /> 2� �Z �� 24 40 8� Z�: 10 30 41 69 135 <br /> 3 12 16 22 31 75 3 20 24 38 6� 128 <br /> 9• Total Number of Perforations equals the Number of Perforations per Lateral multiplied by the Number of <br /> Perforated Laterals. <br /> 17 Perf. Per Lat. X ��Number of Perf. Lat. = 51 Total Number of Perf. <br /> 10. Select Type of Manifo(d Connection (End or Center): 0 End ❑ Center <br /> 11. Select Lateral Diameter (See Table): 2.00 in <br />