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<br />Instream Flow Proposal for the SeQment Located below East Tennessee Creek <br /> <br />The CWCB's proposal for instream flow on Tennessee Creek includes a single <br />segment from Longs Gulch to the confluence with the Arkansas River. In my opinion, <br />the segment should be divided into two reaches at East Tennessee Creek. For the new <br />segment below East Tennessee Creek, the CWCB's proposed instream flow amounts <br />should be reduced to correct for the discontinued transbasin diversion by the Ewing <br />Ditch during fall and winter. The Ewing Ditch is a transmountain diversion ditch, owned <br />by Pueblo, which diverts water from the headwaters of the Eagle River and delivers this <br />water into the headwaters of Tennessee Creek. Gaging data used by the CWCB <br />included the years of 1911 through 1924, during a period when the Ewing Ditch <br />transbasin diversions occurred on a year-round basis. Such diversions during fall and <br />winter were discontinued in about 1927. As shown in the calculations in Table 1, the <br />instream flow appropriation should be reduced to 7.6 cfs during August 15 through <br />November 30 and 5.7 cfs during December 1 through May 14. <br /> <br />Instream Flow Proposal for the SeQment Located Upstream of East Tennessee Creek <br /> <br />I have estimated the appropriate instream flow amount for Tennessee Creek <br />upstream of East Tennessee Creek by several alternate methods. As noted above, less <br />than two cfs is available below the Martin Holm and Lucas ditches from mid summer <br />until the end of the irrigation season. I have concluded that the following instream flow <br />amounts would be appropriate for the remainder of the year: <br /> <br />May 15 - Aug 14 <br />Aug 1 5 - Nov 30 <br />Dec 1 - May 14 <br /> <br />19.0 cfs <br />4.4 cfs <br />2.3 cfs <br /> <br />The rationale for this instream flow proposal is summarized below. <br /> <br />Existina Irriaation Diversions. As discussed above, existing irrigation ditches <br />with 19 cfs decreed rights usually dry up the stream from mid summer through the end <br />of the irrigation season. Thus, less than two cfs is available for appropriation during <br />this time period. <br /> <br />4 <br />