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OSTP Pressure Distribution <br /> UNIVERSITY , <br /> Minnesota Poliution Desi�n Worksheet OF M[NNESOTA _��.��,;�� <br /> Controi Agency <br /> 1. Select Number of Perforoted Lotera(s in system/zone: � Ge�textile <br /> V��l%0����GF7tt�p0!=e�4,.'s,...�i�?� t:�nunumy��„,D' <br /> '�a_ !:'{�Ao�ac�onsz�ucrd 3'ap:rt_:?`��; 2'of rocV:�'�a ��,�_c� <br /> (2 feet is minimum and 3 feet is maximum spering) �- - — .��^:;�?�.��� <br /> � � <br /> 2. Select Perfordtion Spacing: 3.0 ft ' < ,,������fi-..>�- ��G � <br /> - , ,-. <br /> <J., I � ,",r4 ..�t; c��"� <br /> �':.,'�oe, __- r ,�:---- <br /> 3. Select Perforation Diameter 5'rze 7/32 inch �' F , , ,. .. ,a <br /> R•du.�:,non tpaury�z�n,3 <br /> 4. Length of Laterais =Media Bed Length-2 Feet. Perforation can not be c(oser then f foot fram edge. v 11_05.31 <br /> 68 - 2ft = 66 ft <br /> 5• Determine the Number of Perforation Spaces. Divide the length of Laterafs (Line 4)by the Perforation Spacirtg (Line 2)and <br /> round down to the nearest whole number. <br /> Number of Perforation Spaces = 66 ft - �ft = 2Z Spaces <br /> 6. Number of Perforations per Laternl is equat to 1_0 plus the Number of Perforation Spoces (Line 5). <br /> Perjorations Per tateral = 22 SQaces + 1 = 23 Perfs.Per Lateral <br /> Check table be(ow to verify the number of perforatiorn per latera!guaranfees less than a 10%dischnrge variation. The value is <br /> doub(e if the a center manffold is used_ <br /> Maximum Number uf Per(aratiora Pe�LaLeral[a Guara�tes- IWe D*scharge Vana[im i <br /> '.In[ P c+�a^c�; 7i32 tnch Pe�o+-atio�s � <br /> Pipe Diameier(Inche:l Pr-ieration Spac�ng Pipe fiiarneur��nch�e:) � <br /> PerforaNvn Spacing(Fc=U 1 �t.: �y_ I Feeil 1 1 t� ri� 2 3 � <br /> 2 10 13 18 30 60 Z �1 76 21 3i 68 <br /> ?s, P, !2 16 28 Si 2:i �0 1-1 24 31 64 <br /> 3 8 ib 25 52 3 9 �4 19 30 4C� <br /> 3:'16 lr.cb Perfora:ipn: t �8 Incty F'e•fo�ations <br /> Pip�e Diame'Po'tl,�Cha:) P?rfcratio�S�aCing P'�pe D'a.^•�seYer IlncFse:l <br /> Perfurar.u�5pac.n3lFe.ec1 IFeatl 5 1•� th - 3 <br /> � 2 3 <br /> z 12 78 26 46 87 2 21 33 44 �4 1-69 <br /> Zs: 72 17 2� �i0 80 . ..-. ..2✓S 20 30 it 69 135 <br /> 3 12 16 22 37 75 3 20 29 3d 6-i 123 <br /> 7• Total Number of Perforations equals the Number of Perforations per�ate�al (Line 6y multiplied by the Number of <br /> Perforated tnterafs (Line 1). <br /> 23 Perf.Per Lateral X ��Number of Perf. Laterals = 69 Total Number of Perf. <br /> 8. Calcutate the Square Feet per Perforation. Recommended value is 4-f0 jt Z per per(oration. ""`°`""�"D1Sh"�"O°"' <br /> Px(mallon Diunetor <br /> Does not appt y to At-Grades ��a��u� ,, ,,,, i - y, <br /> Bed Area = Bed Width(ft)X Bed Length(ft) -;_� � o.�e o..+ o zc o.�. � <br /> �.s o.zz o.s� nes o.v <br /> 10 ft x 68 fc = 680 fcZ �w o.� o.'" o.e° . ,.a• <br /> 2.5 0.29 O 55 O 89 1.17 <br /> 3,0 0.32 0.7I 0.98 �1.I! <br /> Square Foot per Perforation =Bed Area divided by the Tota!Number of Aerforations (Line 7). =+.a' 0 37 0°3 ,.+3 ,."__ <br /> 5-O`O.dt D.91 1.26 1.65 <br /> �� � ..n. �.'CxC:tt'[�avth:/t6enchlot.'Smc� <br /> b80 ft2 • b9 perforations = 9.9 ft2/perforations ____ ��+������ ___ _ <br /> �ewe:e�.r����e��rn c�.fo,mbz <br /> :ice, :a��euaet;+rre�anA�+STT wich i�i6 <br /> 9. Select Minimum Average Head: 1_0 ft ;�^°°,;°�^�^��"°�°�p^� <br /> ah-�rw.r.r.�,.-<�,c•aw,ksis wan„s�n <br /> �'` peno�a�sw-. <br /> 10. Select PerforQtton Discharge (GPM)based on Table 111: 0.56 GPM per Perforation <br /> 1�• Determine required Flow Rate by rtwt[iplying the Totat Number of Perforotlons {Line 7)by the Perjorafion Dischar,ye (Line 10). <br /> 69 Perforalions X 0.56 GPM per Perforation = 39 GPM <br />