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B 10 6 W I C K <br /> L O 6 A N .. _ <br /> - <br /> PNILLIP$ <br /> s <br /> t <br /> n . <br /> EXPLANATION <br /> { M+taM gF.mw .'1 r" .' SaM�Nwn T�nstn•ef+ <br /> �, M OR 6 A N..I ' W A S N I N 6 T O.M. i•ss Inan w <br /> a0 m 80 <br /> W E L D <br /> ►ri { Guuu..u+e 1tl <br /> t. na aau <br /> I - _ <br /> f A D A M 5 � ... f....«.... _ <br /> 0 <br /> JENVERI / ••. . <br /> WK <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 1 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 />