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� <br />1 <br />' <br />' <br />' <br />' <br />' <br />' <br />, <br />� <br />IJ <br />' <br />L�' <br />' <br />' <br />, <br />1 <br />' <br />when nearby irrigation wells were extensively pumped, was insufficient to prevent well water <br />levels from declining. <br />3.2.2 Recharge Site Northeast of Del Norte <br />Because the recharge site northeast of Del Norte is located outside of the boundaries of the <br />confined or artesian aquifer as mapped from well logs (Emery, Plate 2, 1973), there has been <br />interest in defining the percentage of applied recharge water that reaches the confined aquifer. <br />As can be visualized by studying changes in water levels in the nests of monitoring wells, <br />recharge water infiltrates through surface soils into the aquifer system that comprises several <br />leaking clay lenses that dip easterly. These clay lenses retard the downward flow and due to their <br />dip, cause the ground water to flow easterly. In order for recharge water to enter the confined <br />aquifer as commonly defined, the water must have leaked through the aquifer system to a depth <br />of 100 or more feet by the time it reaches the confined aquifer boundary. Since the percentage of <br />recharge water reaching this depth is dependent largely on the unmeasured retardance of the clay <br />lenses and the slope of the lenses, accurate estimates of percentage of applied recharge water that <br />accrues to the confined aquifer is beyond the scope of this study. However, the increase in water <br />levels in the deeper wells indicate that a significant portion of recharge water has the potential of <br />entering the confined aquifer. For example, in well nest No. 2, ground water level increases of <br />approximately 10 feet were recorded in both the shallow 25.7 foot deep well and the 196.0 foot <br />deep well during the time period between June and December 1995. This related change seems <br />to indicate that nearly 100% of applied water at this site enters depths that are tributary to the <br />confined aquifer. <br />An indication of where recharge water goes can be derived by displaying ground water levels in <br />a cross section of the aquifers along a line between the nests of wells. Comparing ground water <br />elevations between the two well nests that are approximately 440 feet apart, the ground water <br />surface is about one foot lower in the easterly nest than the westerly nest. This elevation <br />difference indicates a significant easterly flow of ground water. <br />3-12 <br />' <br />