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3.8.3.1 Task 1-Perform Feasibility Investigation to Select Method for Estimating <br />Historical Irrigation and Agricultural Pumping. A feasibility investigation is recommended <br />during the first year of SPDSS implementation to determine how historical pumping for <br />irrigation and agricultural purposes can best be estimated. This feasibility investigation would be <br />used to evaluate the reliability and completeness of available historical groundwater pumping <br />records and compare these historical data to pumping data estimated by alternative techniques. <br />3.8.3.2 Task 2-Collect Historical Groundwater Pumping Data. This task would <br />involve interviewing selected groundwater users and compiling, interpreting and analyzing the <br />historical pumping data collected through the interview process. Interviewees would include <br />agricultural, municipal and industrial users. Specific entities that have been identified for <br />interviews include (but are not limited to): <br />• Agricultural-Groundwater Appropriators of the South Platte, Central Colorado Water <br />Conservancy District, Lower South Platte User Group, Bijou Ditch Company, Morgan <br />Ditch Company, Cache le Poudre River Water Users Association, Riverside Irrigation <br />District, North Sterling and Pruitt Irrigation District, and Julesburg Irrigation District. <br />• Municipal-Centennial Water District, Willows Water District, Brighton, Thornton, <br />Westminster, Julesburg Sterling, Ft. Morgan, Ft. Lupton, Watkins, Bennett, Deer Creek, <br />Agate, Brush, Hudson, Roggen, Byers and Larkspur, and South Adams County Water <br />and Sanitation District. <br />• Industrial-Kodak, Budweiser, Coors, Conoco, Hewlett-Packard, and Cargill <br />The SEO (in Greeley and Denver) would also be interviewed for purposes of data collection. <br />3.8.3.3 Task 3-Collect and Analyze Existing Power Records. If the power record based <br />method for estimating historic agricultural and irrigation pumping is selected, based on the Task 1 <br />feasibility investigation, it would be necessary to collect power record data. These data, when <br />coupled with pump rating curves, would be utilized to estimate groundwater pumping both on an <br />annual and seasonal basis. <br />Given that there are an estimated 15,000 wells with capacities greater than 50 gallons per minute <br />(gpm) and approximately 5,700 wells with capacities greater than 500 gpm in Division 1 and <br />Water District 47, this is expected to be a time consuming and complex effort. <br />3.8.3.4 Task 4-Obtain Well Rating Curves. For power records to be used to estimate <br />pumping, it would be necessary to have acceptable estimates of the "wire to water" efficiency for <br />various types of wells/pumps in the study area. Considerable information is available on these <br />efficiencies for wells in the Arkansas River Basin, as a result of the Kansas v. Colorado <br />litigation. This information would be obtained, if available, and used in this task. It would <br />probably be necessary to test sample wells in the South Platte River Basin and determine wire to <br />water efficiencies in order to confidently extrapolate the Arkansas River Basin well data to the <br />South Platte River Basin. <br />p:data\gen\spdss~final report\chapter 3.doc 3 -21 <br />October 31, 2001 <br />