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Ms.Megan Gutwein <br /> August 16,2019 <br /> Page 18 of 25 <br /> Pueblo Reservoir. Even when exchange potential does not exist in the complete reach, there may <br /> be exchange potential in portions of the reach to facilitate stepped exchanges. <br /> Based on this, as well as our professional experience in the administration of the Arkansas River <br /> that exchange operations can be coordinated to leverage exchange potential, it is the opinion of <br /> M&W that through the exchanges and stepped exchanges described above, it will be possible to <br /> exchange water into Pueblo Reservoir for use by Colorado Springs and/or for the replacement of <br /> return flows in pilot project operations. <br /> C. Projection <br /> A projection of example operations in an average year is attached in Appendix I, Table 1-1. In this <br /> example, historical consumptive use is 1,123.7 acre-feet, tailwater is 325.8 acre-feet, deep <br /> percolation is 1,303.0 acre-feet, and lagged deep percolation from March 15 through November <br /> 14 (operation period) is 497.8 acre-feet. Tailwater and lagged deep percolation return flows <br /> occurring during the operation period will be replaced by diversion and return to the Arkansas River <br /> via the Timpas Creek and/or the Crooked Arroyo augmentation stations. Lagged deep percolation <br /> return flows for the next five years after the operation period is a total of 805.2 acre-feet, with a <br /> maximum replacement requirement of 400.1 acre-feet in 2021.The lagged deep percolation return <br /> flows occurring resulting from diversions during the irrigation season from 3/15 to 11/14 will be <br /> replaced with water returned to the Arkansas River through augmentation stations. Colorado <br /> Springs will replace all remaining lagged deep percolation return flows. Table 11 summarizes the <br /> projected HCU and return flow amounts. <br /> Table 11 <br /> Summary of Projection Results <br /> (All values in acre-feet) <br /> HCU Tailwater Deep <br /> Percolation Lagged Deep Percolation <br /> (3/15-11/14) (11/15+54 Months) <br /> 1123.7 325.8 1303.0 1 497.8 805.2 <br /> As demonstrated by the preceding paragraphs, because the Pilot Project operations will be <br /> managed and coordinated in a manner to take advantage of available exchange potential and to <br /> utilize other water resource management techniques, it is our opinion that there are no <br /> administrative or operational obstacles to the proposed operation of the Colorado Springs/Super <br /> Ditch Pilot Project, and that said project can and will be implemented using existing infrastructure, <br /> and no additional diversion structures, augmentation stations, or return structures will be <br /> needed for operations. <br /> Martin and Wood Water Consultants,Inc. <br />