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A. Determine pump capacity. <br />Gravity D' rution <br />1. Mai... •im suggested is 600 gallons per hour (10 gpm) to stay ahead of <br />water use rate. <br />2. Maximum suggested for delivery to a drop box of a home system is 2,700 <br />gallons per hour (45 gpm) to prevent build-up of pressure in drop box. <br />Pressure Distribution <br />3. a. Select number of perforated laterals <br />b. Select perforation spacing = ft. <br />c. Subtract 2 ft. from the rock layer length. <br />mk;;r •2ft. = _ft. <br />d. Determine the number of spaces between perforations. <br />Length perf. spacing - _jam ft. + ' ft.= :,' L- spaces <br />e. 2.z spaces + I= --D -3_ perforations/lateral <br />f. Multiply perforations per lateral by number of laterals to <br />get total number of perforations. 7 <br />t�D x �a= �_ perforations. I., <br />g . x�' gpm. <br />SELECTED PUMP CAPACITY 3-/ gpm <br />B. Determine head requirements - <br />1. Elevation difference between pump and point of discharge. <br />/6) feet <br />2. If pumping to a pressure distribution system, add five feet for pressure <br />required at manifold <br />S feet <br />3. Friction loss <br />a. Enter friction loss table with gpm and pipe diameter. <br />Read friction loss in feet per 100 feet from table. <br />F.L. a '2.G ft./100 ft of pipe <br />b. Determine total pipe length from pump to discharge <br />point. Add 25 percent to pipe length for fitting <br />ioss, or use a fitting loss chart. Equivalent pipe <br />length -1.25 times pipe length = <br />/ _<0 x 1.25 = I qd ' feet <br />c. Calculate total friction loss by multiplying <br />friction loss in ft/100 ft by equivalent pipe length. <br />Total friction loss = D • 1. x / ;d rs +100 = _i_ feet <br />4. Total head required is the sum of elevation difference, <br />special head requirements, and total friction loss. <br />/0 +_$- +�;_ <br />(1) (2) (30 <br />TOTAL HEAD -L O feet <br />C. Pump selection <br />1. A pump must be selected to deliver at least 5 gpm (Step A) <br />with at least 2Q feet of total head (Step B). <br />END PERFORATION OF A PERFORATED LATERAL <br />o.lpw sw w.,.,t sr�il{d <br />MIw ►I«M a.d ryor <br />TABLE OF PERMRATION DISCHARGES IN GPM <br />Head Perforation diameter (inches) <br />Grw Low <br />To1roY <br />I/, <br />b •_• Ufw of Geowo*@ FYrk Ix Iur- <br />Lo y�r Sendra in�ci` -; or owl t .d <br />036 <br />: _ <br />root.POW <br />r� <br />-hrofrw f1rY M� 1W l,anie�ir <br />0.90 <br />la <br />YM D FMW Tor <br />F1 o <br />Al LOW 12' to Ups <br />o wl <br />of YrA Law <br />1.17 <br />3.0 <br />. CMM as&s Ler. <br />Ml� w Lewd <br />o.lpw sw w.,.,t sr�il{d <br />MIw ►I«M a.d ryor <br />TABLE OF PERMRATION DISCHARGES IN GPM <br />Head Perforation diameter (inches) <br />10 <br />ria <br />I/, <br />l.Qa <br />036 <br />0.74 <br />1.5 <br />OA9 <br />0.90 <br />2.Ob <br />0.80 <br />1.O6 <br />2.5 <br />0.89 <br />1.17 <br />3.0 <br />0.98 <br />1.28 <br />4.0 <br />1.13 <br />1.47 <br />SA <br />126 <br />1AS <br />&Use 1.0 foot of head for residential systems. <br />bUse 2-0 fest of hwd for other estaW Wheats <br />Pipe Length <br />Point of Discharge <br />Elevation Difference <br />Pum P `> <br />F -18b <br />1.5 inch 2.0 inch 3.0 inch <br />gPm FriNon km par 1001t of pipe <br />10 <br />0.69 <br />0.20 <br />12 <br />0.96 <br />0.28 <br />14 <br />1.28 <br />0.38 <br />16 <br />1.63 <br />0.48 <br />18 <br />2.03 <br />0.0 <br />20 <br />2.47 <br />0.73 <br />0.11 <br />25 <br />3.73 <br />1.11 <br />0.16 <br />30 <br />5.23 <br />1.55 <br />0.23 <br />35 <br />7.90 <br />2.06 <br />0.30 <br />40 <br />11.07 <br />2.64 <br />0.39 <br />45 <br />14.73 <br />3.28 <br />0.48 <br />50 <br />3.99 <br />0.58 <br />55 <br />4.76 <br />0.70 <br />60 <br />5.60 <br />0.82 <br />