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Hydrologic Data 0 i <br />After receiving the cooperating agency's biologic recommendation, the CWCB and BLM staff, <br />conducted an evaluation of the stream hydrology to determine if water was physically available <br />for an instream flow appropriation. Although there is a substantial amount of streamflow gage <br />data available for the Uncompahgre Plateau and Glade Park, most of this data is severely <br />impacted by diversions and irrigation use. This situation makes it difficult to estimate the natural <br />flow regime for the watersheds on the Plateau. Without specific gage data to evaluate, the next <br />best approach is a regional equation that estimates annual flow characteristics. The USGS has <br />developed regional equations (Estimation of Natural Streamflow Characteristics in Western <br />Colorado, Water Resources Investigations Rebort 85 -4086, 1985) that apply to the Uncompahgre <br />Plateau and Glade Park based on basin drainage area, mean annual precipitation, mean basin <br />elevation and mean basin slope. The report "Uncompahgre Plateau and Glade Park Annual <br />Hydrograph Estimation" in Appendix C, explains staff's water availability analysis in more <br />detail. Table 2 below displays the estimated stream flow of North Fork West Creek. <br />Table 2: Estimated flow North Fork West Creek. <br />January February March April May June July August September October November December <br />I 0.42 1 0.91 1 1.3 1 20 1 72 1 33 1 1.7 1 0.65 1 0.54 1 0.51 1 0.5 1 0.46 I <br />North Fork West Creek Estimated Stream Flow <br />5 <br />4 <br />3 <br />V <br />1 <br />0 <br />JAN FEB MAR APR MAY JUN JUL AUG SEP OCT WN DEC <br />Month <br />Table 2 shows that the summer flow recommendation of 3.7 cfs is only available April I s ' <br />through June 30 Table 2 also shows that the winter flow recommendation of 0.8 cfs is only <br />available from July 1 St through July 31 and February 15 through March 31 The winter flow <br />