Charles Avery 1986 <p>This study is one of a series of studies appraising the waterbearing properties of the Navajo Sandstone and associated formations in southern Utah. &nbsp;The stu&lt;¥ area is al:x&gt;dy area is about 4,600 square miles, extending from the Utah-Arizona State line northward to the San Juan-Grand County line and westward from the Utah-Colorado State line to the longitude of about 109°50'.</p><p>Some of the water-yielding formations are grouped into aquifer systems. The C aquifer is comprised of the DeChelly Sandstone Member of the Cutler Formation. &nbsp;The P aquifer is comprised of the Cedar Mesa Member of the Cutler Formation and the undifferentiated Cutler Formation. The N aquifer is comprised of the sedimentary section that includes the Wingate Sandstone, Kayenta Formation, Navajo Sandstone, Carmel Formation, and Entrada sandstone. &nbsp;The M aquifer is comprised of the Bluff Sandstone Member and other sandstone units of the Morrison Formation. &nbsp;The D aquifer is comprised of the Burro Canyon Formation and Dakota Sandstone. &nbsp;Discharge from the ground-water reservoir to the San Juan River between gaging stations at Four Corners and Mexican Hat is about 66 cubic feet per second.</p><p>The N aquifer is the main aquifer in the study area. Recharge by infiltration of precipitation is estimated to be 25,000 acre-feet per year. &nbsp;A major ground-water divide exists under the broad area east of Monticello. &nbsp;The thickness of the N aquifer, where the sedimentary section is fully preserved and saturated, generally is 750 to 1,250 feet. &nbsp;&nbsp;Hydraulic conductivity values obtained from aquifer tests range from 0.02 to 0.34 foot per day. &nbsp;The total volume of water in transient storage is about 11 million acre-feet. Well discharge somewhat exceeded 2,340 acre-feet during 1981.&nbsp; Discharge to the San Juan River from the N aquifer is estimated to be 6.9 cubic feet per second. Water quality ranges from a calcium bicarbonate to sodium chloride type water</p> application/pdf en Utah Department of Natural Resources, Division of Water Rights Bedrock aquifers of eastern San Juan County, Utah reports