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' University of Minnesota Pressure Distribution System Design -10/25/04 <br /> a aarea�scer�s mwr ae�ene►sar wr ae�e�a <br /> or�..s <br /> � <br /> �. seba ma�er a4 perroratea laEerals: � T�,,,'�'T <br /> 2. sebcc perfo�aaon spaang= Oft <br /> c.�...,:k w..,� <br /> 3. Since perforatior�s sFauld not be piaoed doser that 1 foot to <br /> the edge d the rodc Iayer(see dia9r�n),subtrad 2 feet from "�' 'p.,�k <br /> ��� <br /> 50 -2 ft= 48 R ��f'.`�-�p�^��jlg�gl/�' <br /> � <br /> 4. Detertn�e tlie numbef of spaoes betw�eeo perfo�atior�s. <br /> Divide tha lengtli(3)bY P�sP�9(2)and round doMm to n�rest whole nwnber. <br /> Perforafion spac�ng= 48 ft/ 3 ft= 16 <br /> 5. Seled pefioraGon size 1/4 irx;h <br /> 6. Nksnber of peAaatiais is equal fo one plus the number of PeAoraYon sPaoes(4)• <br /> •Chec�c!lare E�41b esswe tlie numberof perlb►ations per�tera!gu�aMees <br /> <10%�►$e�. <br /> 16 spaoes+1= 17 pe�foraaonsAateral <br /> E�Yaximun Num of 114 Mch porMrations E-b um N�anber of 3H6 inch peiforatlons <br /> Isl�ral m ra�ee<10% variatlon labxal bo rarMee<10'1G d varlatlon <br /> SP�in9 P�e D�n�r Spaci�9 P�e Diemeber <br /> ft 1 inch 1.25 irxd� 1.5 inch 2.0 irx;h feet 1 ir�ch 1.25 inch 1.5 inch 2.0 inch <br /> 2.5 8 14 18 28 2.5 12 19 5 39 <br /> ,:t�x _ �.� �::'��. ,� '� . _. �'� � � �:�::: <br /> 3.3 7 12 16 25T J� 3.3 10 17 23 36 <br /> �3.�,- .a�_: - ;, �_ r:: <br /> r;":.,.�_ �+�-.'. . '��.x �'.:is� _ ; .�.- .� �'.� ;; •.� z � <br /> 5.0 6 10 14 22 5 3�9 15 20 31 <br /> 7. A Tated raxnber of perforations=Perfo►ations per late�al(5)timea number of laf�erals(1). <br /> 17 perfaJ lat x 3 laberala= 51 perforatior�s <br /> B.Cak�e ihe square foofsge Per Pe�o�tiO�• <br /> Reoonrnsndsd value is 6-10 sq�NpeA.Does not appl�r to at�rades. <br /> 1. Rodc bed amea=rodc width(R)x rock lengtl�(ft) <br /> 10 �x 50 R= 500 1'� <br /> 2. per perforation=Rodc 8ed Area/oumber of perfs(6) <br /> 500.0 fl/ 51 parfs = 9.8 ft/perf <br /> 8. Delem�aie requred flow rate by m�ying the totai n�rtnber <br /> �P�(�)bY�P�P��s�see figure E�) <br /> 51 perfs x 0.74 gpm/perfs= 37.7 gpm <br /> E-6 PerMratloo n GPM <br /> Head rforations diameter <br /> feet inches <br /> 3/1 7/32 1/4 <br /> 1 0. 0.56 0.74 <br /> +���';�as ���:,,: <br /> 5 0.94 1.26 S 1 1.65 <br /> a. u.s 7.0�Oat tor sYqls�nly nanes. - <br /> �--------- ------�-------- �i <br /> b.lke 2.0 Feet(or eke � = .„"" <br /> ' r��^�.,.� <br /> 9. Detertnine Min�num Pipe Sire � `;'; . ` -' � <br /> A. ManHoW on End. If laterala are connec�ed to header Pipe � �..�,,,�.,,.. I <br /> as shown in Figure E-1,to seled minimum required lateral !�..E-�:M���a�d a.�„ � . <br /> diame�er;erMer figure E-4 or E-5 wHh peAoration spacing and <br /> �-- ----------------__ _-----------_ <br /> number of perfora6oris per lateral.Seled minimum diameter <br /> for peAoratad la�erals= 2.0 inc�es <br /> B. Cenbor Manffold. If pe�fora6ed Iateral system�s attached tO „�E�M�,�- --__ <br /> manifdd ppe near the oenter,kkke Figure E-2�Perforrated lateral len9th(3) ,-F-�:;:;;,._ , <br /> and nu�of perforations per la/eral(5)wi11 be appropma�y . - _: � , <br /> one half of That in step A. Using these valuea seled , <br /> minimum diameter for perfora�ed la�aral= 1.5 inc�es ` _ f�- ,, <br /> I hereby that I have car�pleted this worlc u�accordanoe wilh a9 sppNcable ordinanoes�rules atxl Iaws. <br /> (signature) 810 (license�) 07102r07(date) . <br />