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shall have a coefficient of manufacturing variation (Cv) of no <br />more than seven percent. Irrigation system design shall be such <br />that the emitter flow variation shall not exceed plus or minus ten <br />percent. Emitters shall be recommended by the manufacture for <br />subsurface use and gray water use, and shall have demonstrated <br />resistance to root intrusion. <br />(3) Each irrigation zone shall be designed to include no less than the <br />number of emitters specified in Table 16 -3, or through a <br />procedure designated by the authority having jurisdiction. <br />Minimum spacing between emitters is 14 inches in any <br />direction. <br />(4) The system design shall provide user controls, such as valves, <br />switches, timers, and other controllers as appropriate, to rotate <br />the distribution of gray water between irrigation zones. <br />(5) All drip irrigation supply lines shall be polyethylene tubing or <br />PVC class 200 pipe or better and schedule 40 fittings. All joints <br />shall be properly solvent- cemented, inspected and pressure <br />tested at 40 psi, and shown to be drip tight for five minutes, <br />before burial. All supply lines will be buried at least eight <br />inches deep. Drip feeder lines can be poly or flexible PVC <br />tubing and shall be covered to a minimum depth of nine inches. <br />(6) Where pressure at the discharge side of the pump exceeds 20 <br />pounds per square inch (psi), a pressure reducing valve able to <br />maintain downstream pressure no greater than 20 psi shall be <br />installed downstream from the pump and before any emission <br />device. <br />(7) Each irrigation zone shall include a flush valve /anti- siphon <br />valve to prevent back siphonage of water and soil. <br />(B) Standards for a mini -leach field system: <br />HAW ) Perforated sections shall be a minimum three (3) inch (80 <br />mm) diameter and shall be constructed of perforated high - <br />density polyethylene pipe, perforated ABS pipe, perforated PVC <br />pipe, or other approved materials, provided that sufficient <br />openings are available for distribution of the gray water in to the <br />trench area. Material, construction, and perforation of the pipe <br />shall be in compliance with the appropriate absorption fields <br />drainage piping standards and shall be approved by the authority <br />having jurisdiction. <br />1';t '7oI <br />1r,r nrcri 1 rnrCrr(1111C is io 2006 I I'( as provided ill Hi!! '69 <br />