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The DOW has reviewed the data collected to date and believes a 100 cfs year -round instream <br /> flow would preserve the natural environment to a reasonable degree, as provided in the letter <br /> (copy attached) to Ted Kowalski from Mark Uppendahl dated May 5, 2006. DOW recommends <br /> that the CWCB appropriate the 100 cfs proposed instream flow. <br /> Hydrologic Data <br /> After receiving DOW's biologic recommendation, the CWCB staff conducted an evaluation of <br /> the stream hydrology to determine if water was physically available for an instream flow <br /> appropriation In determining water availability, CWCB Staff examined two of the historic <br /> stream gages on the Arkansas River: (1) Arkansas River above Pueblo, Colorado (USGS Gage <br /> 07099400) and (2) Arkansas River at Moffat Street at Pueblo, CO (USGS Gage 07099970). <br /> Table 2 displays the average and 50% exceedence monthly flows on the Arkansas River at the <br /> Arkansas River above Pueblo gage. This gage is directly downstream from Pueblo Reservoir <br /> and is located upstream of both proposed instream flows For the period of record of this gage <br /> (1965 — 2004), both the monthly average and the 50% exceedence are greater than the <br /> recommended 100 cfs flow amount. Table 3 displays the average and 50% exceedence monthly <br /> flows on the Arkansas River at the Arkansas River at Moffat Street gage. This gage is located <br /> between the two proposed instream flows and is affected by several diversions within the reach. <br /> For the period of record of this gage (1988 — 2004), the monthly average and 50% exceedence <br /> are greater than the 100 cfs recommendation for all months of the year with the exception of <br /> December and January. <br /> 9 <br />