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- 8E OG IN I CK <br /> O G',A N` , <br /> ......' P N 1 L L I P'E <br /> EXPLANATION <br /> �em» $.lWMgn iM1x 1w n <br /> W A 8 N 1 N G T'0 8 NncM1+see i <br /> ...m. w <br /> 60.160 <br /> I01.040 N <br /> Gr.iN.awM1+NI <br /> NO iab <br /> Map 5. Aquifer Cross-Sections at Five Locations along the S. Platte River. <br /> Source:Colorado Groundwater Atlas,Colorado Geological Survey. <br /> Groundwater Use <br /> Prior to 2003, on average nearly 500,000 AF of groundwater was pumped annually in the S. <br /> Platte basin from approximately 8,200 high capacity wells (Figure I and Map 3). Agricultural <br /> pumping between the years 1950 to 2000 was calculated to average 438,000 AF/yr with <br /> municipal and industrial pumping growing to approximately 50,000 AF/yr during this same <br /> period. There are now approximately 6,500 high capacity wells in the basin and total annual <br /> groundwater pumping in the basin is now closer to 450,000 AF/yr with agricultural pumping in <br /> the 400,000 AF/yr range (Table 2). Approximately 1,000 high capacity wells were abandoned <br /> through the 2010 Abandonment List, many of these were former GASP wells and of these, many <br /> had low pumping rates and were supplemental for drought insurance. Central Colorado Water <br /> Conservancy District has approximately 1,200 wells in the WAS and GMS plans that are on a <br /> quota system and not able to pump anywhere near 100% of full crop ET (GMS quota has been in <br /> the 35%range since 2006; WAS quotas have been even less). Most of the other irrigation wells <br /> in adjudicated augmentation plans have full or near full allocations in most years. While rules <br /> now require well owners to meter and provide pumping records, it will likely be several years <br /> before we have accurate accounting of wells metering records to determine exactly how much <br /> individual wells are pumping and how much water is extracted from the various reaches of the <br /> alluvium in the basin. <br /> 47 <br />