2004-P07657 - new septic - Laserfiche WebLink

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. ' PROSURE DISTRIBUTION SYSTEM Geotextile fabric 1. Select numbe of perforated laterals Z . liner inch lions 2. Select perforation spacing= 3.0 ft ' . ..., :,.....,":::::.:.• . .•• ' t..,,!c..: F.'. • • PertSizing 3/16"-1/4" l 3. Since perfora 'ons should not be placed closer than 1 foot to Perf SPadng 1.5*-5' the edge of rock layer(see diagram),subtract 2 feet from the rock layer ength. E-4: Mmdnnun allowable number of 1/4-Inch perforations per'laterd to guarantee<10%.d1scharge variation C°1- -2 ft = t.0 ft perforation xoc�t +n►uw :spacing 4. Determine the umber of spaces between perforations. (feet) 1 inch .1.25 inch, .1.5•inch 2.0 Inch Divide the len (3)by perforation spacing(2)and round dawn to ne t whole number.. • • g 14 18 28 Perforati spacing=_kg_ft+ 3 ft= a.O spaces 3.0 ' 8 13 17 26 3.3 7 12 16 ' 25 • 5. Number of p , orations is equal to.one plus the number of 40 7 11 15 23 a (4)..Check figure E-4 to assure the number of perforation spa . 5.0 6 10 14 22' perforations per• feral guarantees<10%discharge variation. • -a-0 •aces+1 =...a.L .perforations/lateral E-6: Perforation Discharge in gpm 6. A. Total numb= of perforations= perforations per lateral(5) perforation diameter times numb= of laterals(1) head inches) (feet) 3/16 7/32 1/4 7,1 • . /lat x 3 lat= 1.3 perforations 1.00 0.42 0.56 0.74 B. Calculate the -• : e footage per perforation. 2,Ob 0.59 0.80 1.04 Should be 6-1 i sgft/perf.Does not apply to at grades. Rock bed area rock width(ft)x rock length(ft) 5.0 0.94 1.26 1.65 pft X L ss �L sgft . a use 1.0 foot for single-family homes. Square foot • ,perforation=Rock bed area+number of perfs(6) b use 2.0 feet for anvthlno else. (e0-f. sgft+ L4 perfs= 9,s: sgft/perf wwra o Lowe AT ee or IPACIAAK oarniwnoN SYSTEM 7. Determine req ' - • flow rate by multiplying the total number of perforations"(6A •by flow per perforation'(see figure E4) "ter 114`4,)102 �..w .Sam • - . x ,n 4 gpn.1/parts= 4 9 gpm • - �. 8. If laterals.are c• ected to headerpipe as shown on upper , VIZ example,to sele minimum requited lateral diameter;enter . 4 figure E- with p oration spacing(2)and number of perforations \ "d°1 per lateral(5) Set minimum diameter for • ,,,,,,, ,. Var.ne perforated lateral inches. 9. If perforated later system is attached to manifold pipe near „,,,,,..- the center,lower gram,perforated lateral length(3)and •I.. number of perfora 'ons per lateral(5)will be approximately one "..n..•, • half of that in step . Using these values,select minimum .a• , diameter for perfo ted lateral= 1/11- inches. ..OP eA I hereby certify that II have mpleted this work in accordance with applicable ordinances, rules and laws. (., A ---' (signa re) 3"19 (license#) . `S-1)-D q ' (date)