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� OSTP Pressure D�stribution <br /> UNIVERSITY - �"��' <br /> M co�ro AP einc�� Desi�n Worksheet OF 1VIINNESOTA �� <br /> 9 y �„ <br /> 1. Select Number of Perforated Laterols fn system/zone: � � <br /> (2 feet is mfnimum u»d 3 feet is mmrimum spucing) ��" �' 2��'°d` <br /> 2. Select Perforadon Spocing: 3.0 ft - - ' 'r- - <br /> 9'af mdc <br /> 3. Setect Perforation DtQmeter Size 1/4 incfi <br /> verforauun six�y:'/.•m 7: <br /> Pprforatlon 2'to 3' <br /> 4. length of Laterots =Media Bed Length-2 Feet. Perforution can not be closer then 1 foot from edge. <br /> 38 - 2ft = 36 ft <br /> 5• Determine the Number oj Perjorution Spaces. Divide the Length of Laterats (Line 4)by the Perforatlon Spocing (Line 2)and <br /> ramd down to the r�arest whote number. <br /> Number of Perforation Spaces = 36 ft : �3 ft = 12 ;' Spaces <br /> 6. Number af Perforotions per Lvtera[ is equal to 1.0 plus the Number of Perforation Spaces (Line 5). <br /> Perforetions Per Latera! = 12 ` Spaces + 1 = 4 3 Perfs. Per Lateral <br /> Check Toble 1 to verifty the rwmber of perforutions per tateral qunrentees less than a lOSK dlscharge variatfion. The vaiue is double if <br /> the a center ma►nfold is used. <br /> 7• Totat Number of Perforfltions equals the Number of Perforutfons per Lntere! (Li�6)multiptied by the Number of <br /> Perforuted Latera(s (Line 1). <br /> 13 Perf. Per Laterat X �Number of Perf.Laterals = 39 Totat Number of Perf. <br /> 8. Calcutate the Sq�are Feet per Perforutton. Recommer�ed vatue is 4-10 ft� per perforohon. ' <br /> wr+arauen oVe+r�e tov�a► <br /> Does not apply to At-Grades �,,,,,� ' <br /> Bed Area = Bed Width(ft)X Bed Length(ft) �•w av ,,� ,,N ,,Y y� <br /> �Q ft X 3$ ' ft = 38Q {,� �.w au ast ass , a�s <br /> Z �s o.n as� aa9 o.s <br /> so` asa asa aao �.oa <br /> iS 0.29 O.p Q{9 1.17 <br /> Sc�are Foot�r Perforntion =Bed Area divided by the Tota!Number of Perforotfons (Li�7). �9 au an asa ,a. <br /> �.O 0.7I 0.l3 7.1D 1.47 <br /> :�:�.- Q41�.. 0.1!'� 1.2��:��. 1.65��� <br /> 380 ft2 a 39 perforations = 9.7 ft2/pertorattons ,�„� 1/4 hitA and 3/16 Lc1f perfa�atla6 on <br /> 9. Select Minimum Average Head: 1.0 ft ,�a�������� <br /> z r«c .sa+ww.nena <br /> t I4 fid�a�d 3/16 td�pNaoNon6 un M575 <br /> sr..t tielrcnoerroranonsonMsrs <br /> 10. Setect PerforoHon t�schorge (GPM)based un Table IIL• 0.74 GPM per Perforation • <br /> �1• Deternrine required Flow Rate by rtniltiplying tl�Total Number af Perfomtions (Lir�7)by the Aerforatlon Dlscharge (Line 10). <br /> 39 Perforations X 0.74 GPM per Perforation = 29 ` GPM <br /> 12. Se(ect Type of Manfjotd Connection (End or Center): �Er,d ❑c�e� <br />