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not be attributed to discharge. Because the FBI requires modification for use in many areas, <br />the number indicating a certain water quality rating will vary among regions. Comparison <br />of the values produced within a given system should, however, provide information <br />regarding difference in sites based on nutrient enrichment. Values for the FBI range from <br />0.0 to 10.0, and increase as water quality decreases (Plafkin et al. 1989). <br />FBI values varied seasonally and among sites in the study area (Figure 38). These values <br />ranged from 1.53 at RFR-H13 in October 2001 to 6.06 at FPR-RES in May 2002. On each <br />sampling occasion the highest values were obtained at FPR-RES. This is likely an effect of <br />the physical processes imposed by the dam. Other relatively high values were reported from <br />RFR-C. Although values obtained from RFR-C do not exceed 5.78 (in a possible range of <br />1.0 to 10.0), the values represent a consistent relative increase from FBI values reported for <br />upstream sites on the Roaring Fork River. The available data suggests that some organic <br />enrichment occurs upstream of RFR-C. <br />Figure 38. FBI values obtained from sites on the Fryingpan River and Roaring Fork <br />River, Colorado. <br />FBI Values <br />11 <br />ipring 2002 <br />2001 <br />2001 <br />KFK-!11 -- ---- _ <br />RFR-HB <br />Site RFR-C <br />Draft Final Report, Fryingpan and Roaring Fork Rivers February 12, 2003 <br />Miller Ecological Consultants, Inc. Page 45