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(2) Pursuant to Morgan County Regional Electric Association records, the <br />Uhlenhopp Well was not pumped from 1969 through 1976 and then <br />pumped from 1977 until October 1985. The land the Uhlenhopp Well <br />irrigated was enrolled in the Federal Conservation Reserve Program in <br />1989. <br />(3) The decree in Case No. 97CW234 found that the Uhlenhopp Well <br />historically irrigated 130 acres located in the SE1/4 of Section 33, <br />Township 4 North, Range 55 West, 6t' P.M., Morgan County, <br />Colorado. The decree in Case No. 97CW234 also found that the <br />average historic consumptive use of the Uhlenhopp Well, when the <br />well was fully used for irrigation purposes, was approximately 200 <br />acre-feet per year. Monthly consumptive use was estimated using crop <br />requirements and climate data for the duration of well pumping. <br />Approximately 9 acre-feet of post-pumping depletions from use of the <br />Uhlenhopp Well from 1977 to 1985 will affect the South Platte River <br />in Water Year 2010. <br />4) Timing of Water Depletions. <br />a) Pumping of the Pinneo Feedlot Wells, and past pumping of the Uhlenhopp <br />Well, have a delayed impact on the flows of the South Platte River. The <br />timing of that impact can be determined using the stream depletion factor <br />("SDF") method of estimating delayed impacts of well pumping developed <br />by the U.S. Geological Survey (Jenkins) ("USGS"). The SDF method is <br />widely used and is an appropriate method to determine the effects of well <br />pumping in this case. SDF values for input into the model are based on <br />factors developed by the USGS as digitized by Mario Mejia-Navaro with the <br />IDS Group at Colorado State University. In the immediate vicinity of the <br />Pinneo Feedlot Wells, the USGS did not have SDF values mapped. SDF <br />values can be determined using a linear interpolation of the USGS-derived <br />SDF values in the surrounding area. <br />b) In addition, the decree in the Headley Recharge and Augmentation Project <br />(Case No. 90CW 189) approved the use of the SDF method to calculate both <br />the depletions and accretions associated with numerous structures; use of the <br />SDF method to determine the Pinneo Feedlot Well depletions thus results in <br />a consistent methodology used for all depletions and accretions under this <br />plan. The SDF values for the Pinneo Feedlot Wells and Uhlenhopp Well are <br />as follows: <br />(1) Jack Boxer and Son Well No <br />(2) Jack Boxer and Son Well No <br />(3) Jack Boxer and Son Well No <br />(4) Jack Boxer and Son Well No <br />(5) Uhlenhopp Well No. 10643: <br />1-10538: 3,070 days. <br />2-10539: 3,190 days. <br />3-10540: 2,580 days. <br />4-10330-F: 2,830 days. <br />3,020 days. <br />8 of 33