Board Meeting 12/09/1998 - Laserfiche WebLink

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DrainaQe Area Correction. The drainage area on Tennessee Creek below Longs Gulch is equal to 41 percent of the overall Tennessee Creek drainage basin area. Therefore, the availability of water to meet instream flow requirements is equal to 41 percent of the amount in the lower segment. Calculations for the drainage area correction are included in Table 1. Halfmoon Creek Galle Records. As discussed above, Halfmoon Creek is a nearby tributary of the Arkansas River with similar drainage basin size and character. Review of the long-term gage records for Halfmoon Creek indicates that a minimum streamflow of 4.4 cfs has occurred during August 15 through November 30 and 1.2 cfs has occurred during December 1 through May 14. Field Observations. Field observations during late November and early December 1998 indicate that streamflows upstream of East Tennessee Creek were in the range of 4.3 to 4.5 cfs. These observed flows are compatible with my proposed instream flow proposal of 4.4 cfs for August 15 through November 30 and 2.3 cfs for December 1 through May 14. These observed flows are clearly not compatible with the CWCB's proposal of 9 cfs and 7 cfs, respectively. It is noted that the flow measurements were made at a time of above-average streamflow conditions in the region, based on a comparison of stream gage measurements in the area versus long-term averages as summarized below. LONG-TERM MEASURED FLOW AVERAGE FLOWS DECEMBER 4.1998 (cts) lefs) NOVEM8ER DECEMBER Eagle River at Red Cliff 32.1 13.5 11.3 Eagle River at Gypsum 257 241 199 Blue River at Farmers Corner 46.8 38.9 31.3 R2CROSS Calculations. As described above, Wheeler conducted an R2CROSS measurement on Tennessee Creek upstream of the confluence with East Tennessee Creek. The results indicate that the observed streamflow of 4.52 cfs would be more 5