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<br />sewage treatment program contemplates .reuse of the effluent produced <br />by its sewage treatment plant for irrigation of approximately 120 <br />acres of pasture and hay meadow historically irrigated by water <br />diverted through Vulcan Ditch. This program will require construc- <br />tion of a pond in which to store effluent during the winter period <br />when no land is being irrigated. This pond will be emptied each <br />succeeding summer by means of the said land treatment program, so <br />that storage space will be available for the storage of effluent <br />during the following winter. This will result in there being no <br />carryover storage from one year to another. The exact size of the <br />effluent pond has not been determined, but it is expected to have a <br />surface area of between four and twenty acres. The evaporation of <br />water from the surface of this pond is calculated to be 1.0 acre <br />feet per acre of water surface per year calculated at the design <br />high water level. Applicant will supplement the irrigation of the <br />pasture as required for a full supply thereon by the direct diversion <br />of water through the Vulcan Ditch or the Riverbend wells. For <br />the historic hay meadow, regardless of whether it is irrigated by <br />this effluent or by water diverted through Vulcan Ditch or the '• <br />Riverbend wells, consumptive use is calculated to be 2.0 acre feet , <br />per acre per year. The consumptive use of irrigation water for lawn <br />and landscape purposes is also calculated to be 2.0 acre feet per <br />acre per year. <br />6. The total yearly consumptive use resulting from the <br />several purposes envisaged by applicant may be conveniently ex- <br />pressed by the following formula: <br />' [0.0118 acre-feet x A] + [1.0 acre feet/acre x B] + <br />[2.0 acre feet/acre x C] + D = 440 acre feet <br />where A is the total number of residential equivalent <br />units; B is the surface area in acres calculated at the <br />design high water level of the sewage effluent storage <br />pond; C. is the total number of acres of lawn, landscape <br />or other irrigation supplied by the central water system <br />and the number of acres of historic hay meadow continued <br />in irrigation, each year; and D is the total yearly amount, <br />in acre feet, of any other consumptive uses. <br />The use of this formula limits the amount of watex which may be <br />consumptively used to an amount which will prevent injury to other <br />-4- <br />