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PRESSURE DISTRIBUTION SYSTEM GeotexWe fabric <br /> 1. Select number of perforated laterals 3 arca tom, ac�ffnmws aced 03' ? 2 <br /> ' 7 777 <br /> Df <br /> 2. Select perforation spacing= 3 , O ft <br /> 3. Since perforations should not be�placed closer than 1 foot to Peerf S'�3/16"5�/4„ <br /> the edge of the rock layer(see diagram),subtract 2 feet from <br /> the rock layer length. E-4: Maltlmum aiiowable number of 1/4-inch pedorations <br /> s/ -2 ft = 3 ft per'laterd to guarantee<10%discharge variation <br /> y�m pedoraiion <br /> 4. Determine the number of spaces between perforations. ai�g <br /> Divide the length(3)by perforation spacing(2)and.round 1� IM inch .1.5-Inch 2,0 Inch <br /> d=to nearest whole number. <br /> • 2:5 8 -14 18 28 <br /> Perforation spacing=.3 ft+ ft= ? spaces 3.0 8 13 17 26 <br /> 3.3 7 12 16 ' 25 <br /> 5. Number of perforations is equal to one plus the number of 4.0 7 11 15 23 <br /> perforation spaces(4). Check figure E-4 to assure the number of <br /> perforations per lateral guarantees <10%discharge variation. 5.0 6 10 14 22 <br /> spaces+1 = perforations/lateral E-6: Perforation Discharge in gpm <br /> 6. A. Total number of perforations= perforations per lateral(5) . perforation diameter <br /> times number of laterals(1) , i head inches <br /> 414 <br /> I`e'perfs/lat x lat=;_perforations Ile' 3/16 7/32 114 <br /> 1.00 0.42 0.56 0.74 <br /> B. Calculate the square footage per perforation. 2.0b 0.59 0.80 1.04 <br /> Should be 6-10 sqft/perf.Does not apply to at grades. <br /> Rock bed area= rock width(ft)x rock length(ft) 5.0 1 0.941 1.26 1 1.65 <br /> Icy ftx—��,ft= Sgft o use 1.0 foot for single-fonNly homes. <br /> Squaree foot per perforation=Rock bed area+number of perfs (6) b use 2.0 feet for onvthlncl else, <br /> sgft+ SL�_perfs= /0,-I— Sgft/perf MAWWOLO LOCATED AT Ve or PFUMME 061gISUTION SYSTEM <br /> 7. Determine required flow rate by multiplying the total number of <br /> perforations(6A) .by flow per perforation(see figure E-6) „X„ <br /> perfs x _�4 9-nm/perfsl gpm <br /> 8. If laterals are connected to header pipe as shown on upper <br /> 10-11` icy.' , <br /> example,to select minimum required lateral diameter;enterlowor <br /> figure E-4 with perforation spacing(2)and number of perforations <br /> per lateral(5) Select minimum diameter for <br /> LAYOYT 16M014T[O wt uTE11ALS ron <br /> perforated lateral= inches. X0� 18 <br /> 9. If perforated lateral system is attached to manifold pipe near <br /> the center,lower diagram,perforated lateral length(3) and <br /> number of perforations per lateral(5)will be approximately one P9W1W'%W"W or <br /> half of that in step 8. Using these values,select minimum <br /> diameter for perforated lateral= I�l-z__ inches. <br /> �d <br /> I hereby certify that I have comp eted this work in accordance with applicable ordinances, rules and laws. <br /> �' (signature) � —(license#) 1 —D z (date) <br />