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� OSTP Pressure Distribution � <br /> Min�esotaPollutjon Desi n Worksheet UNIVERSITY <br /> �� � � OF MINNESOTA '�,.� <br /> Project ID: v 03.19.15 <br /> 1. Media Bed Width: 10 ft <br /> 2. Minimum Number of Laterats in system/zone = Rounded up number of [(Media Bed Width - 4) = 3] + 1. <br /> ( 10 - 4 ) ; 1 = ��laterals Does not apply to at-grvdes <br /> 3. Designer Selected Number of Laterals: �taterals <br /> Cannot be less than (ine 2 (uccept in at-Qradesl <br /> 4. Select Perforation Spvcing: 3.0 ft - - � �"w����� •�'" t__ <br /> ,. ...�...,....w..,.... �-�. � ,—,- <br /> 5. Select Perforation Diameter Size: 1/4 in ._ <br /> .,.,... - �.�...,.,...�,... <br /> 6. Length of Loterols = Media Bed Length - 2 Feet. <br /> 50 - 2ft = 48 ft Perforotion con not be ctoser then t foot from edqe. <br /> � Determine the Number of Perforat3on Spaces. Divide the Length of Laterols by the Perforation Spacinq <br /> and round down to the nearest whole number. <br /> Number of Perforation Spoces 48 ft = ��ft = 16 Spaces <br /> Number of Perforatfons per Lnteral 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 double with a center manifold. <br /> Perforations Per L.aterat = 16 Spaces + 1 = 17 Perfs. Per Laterat <br /> M�NunbK of M�or�tiem!�w tat�t bo G�nnta��10l�Oixlw+�Y�ri�tian <br /> �• �^S 7/32 MKh onlip� <br /> P�+'ioration Sp�d�(Feet) �Di�t�r�tnctiesl P�rioration Spicin� P�e Di�n�(M�s! <br /> 1 11t ith 2 3 (Fset! 1 Itl 1►4 2 3 <br /> Z /0 13 1t �0 i0 2 it 1� 21 31 M <br /> rn 1 12 16 t1 54 2�i 10 14 20 32 M <br /> � t t2 1i S SI 3 i 1� M �0 ifl <br /> 3/ti hrch Perfarations 1>A IrKh Ptrfontions <br /> P+�rrformon Sp�c�(Feet) �O++nwt�(hdwsi trrioration SP�caq Pipe DiametK(M�d+es) <br /> 1 1M 1Yt 2 3 IFeetl 1 1'� 1� 2 3 <br /> 2 12 11 2i �6 p 2 21 33 �4 74 1,! <br /> Z►'f t I 17 2� �0 a0 2ti: 20 30 �1 6! 13S <br /> � 12 t� 2t �7 7S 3 20 2� �t il it�i <br /> 9• Totol Number of Perforotfons equals the Number of Perforotions per Lvteral multiptied by the Number of <br /> Perforated Laterols. <br /> 17 Perf. Per Lat. X ��Number of Perf. Lat. = 51 Total Number of Perf. <br /> 10. Select Type of Manijold Connec[ion (End or Center): Q End ❑ center <br /> 11. Select Lateraf Diameter (See TQble): 2.00 in <br />