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<br />-- <br />OGiU <br /> <br />Based upon information obtained from the Geological Survey, the <br />average accumulated amount of drain-out at the end of a 7-month <br />irrigation season was estimated. This amount of drain-out was <br />assumed to be unavailable for pumping during the irrigation season <br />and represented an additional average quantity of water that was <br />required to be diverted so that those water users dependent upon <br />the recharge system would not interfere with the existing ground <br />and surface water users' supplies. Based on the location with <br />respect to the river where recharge occurs, the estimated quantities <br />of drain-out vary. These average drain-out losses were added to <br />the estimated average annual farm delivery requirement in order to <br />obtain the average annual river diversion requirement, The drain- <br />out losses will eventually show up in the river as return flows and <br />enhance the base flow throughout the year. <br /> <br />Recharge Potential <br /> <br />Sizing Criteria <br /> <br />The conveyance and recharge facilities for the study area were sized <br />to be able to accommodate the average annual river diversion require- <br />ment in a 30-day period. This time period was chosen to represent a <br />worst case condition regarding the availability of the required water. <br />Since a portion of the water will be recharged through delivery canals <br />and the remainder through recharge ponds, it was assumed that an <br />average infiltration rate of 1 ftlday could be maintained for the canals <br />and 2 ftlday for the infiltration ponds. <br /> <br />Test Areas <br /> <br />To determine the potential for recharging the ground-water system, <br />four test areas were chosen (exhibit 7) and evaluated. Recharge Area I <br />was designed to serve the lands presently being served by the Fort <br />Morgan Canal; Recharge Area II would provide service to the lands under <br />the Upper and Lower Platte and Beaver Canals; Recharge Area III serves <br />the lands presently irrigated by the Farmers-Pawnee Ditch, Springdale <br />Ditch, and Sterling No.1 and 2 Ditches; and Recharge Area IV provides <br />supplemental irrigation water to the lands served by Bravo and Longtree <br />Ditches. <br /> <br />Recharge facilities were designed for each of the four areas including <br />new canals and diversion works for delivering water, and spreading areas <br />or shallow ponds for transferring the water into the ground, It was <br /> <br />~, <br />