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<br />n1"""'o~" <br />H"J1)(')UIi: <br /> <br />Ve~etation Clearin~ and Water Yield <br /> <br />The amount of proposed clearing as a percentage of each watershed in artificially <br />.cleared openings (man-made openings) is displayed by alternative in Table S-3. <br />These totals are, in turn, used to compare water yield increases and the risk of <br />sediment movement and channel adjustments. <br /> <br />Table 5-3: Vegetation Treatments as a Percent of Watershed Area by Alternative <br /> Alternative <br />Watershed .A.. JL A. L. .Q. 1L <br />Spring, Creek <1 29 4 11 <1 <br />East Forie BlIIsh 13 13 35 30 35 21 <br />West Forie BlIIsh 2S 26 25 25 2S 26 <br />MainslemBlIIsh 33 35 36 35 36 34 <br /> <br />Additional snowmaking would have a similar, if not identical, effect as the full <br />clearing of vegetation and would result in increased water yield. Table S-4 <br />compares the percentage of each watershed subject to a combination of clearing <br />and snowmaking (equivalent clearing). <br /> <br />Table S4: Equivalent Percentage of Watershed Treatments by Watershed and Alternative' <br /> Alternative <br />Watershed .A.. JL A. L. .Q. 1L <br />Spring Creek <1 29 4 11 0 <br />East Forie BlIIsh 13 14 40 31 33 21 <br />West Forie BlIISh 2S 35 37 34 34 33 <br />MainStem Brush 33 44 54 44 '47 43 <br /> <br />I Includ~ snowmakinS and clearinS. No snowmakinc would occur in tho Snowmass Creek basia. <br /> <br />Increased water yield can result in increased sedimentation and even changes. in <br />channel morphology. Equivalent clearing Values under 20 percent are considered <br />to have a low risk of creating flows that would increase sediment transport. <br />Between 20 and 30 percent clearing, there would be a moderate risk of sediment <br />transport and changes in channel conditions. Between 30 and 40 percent, there <br />would be a high risk of increasing sediment and bedload movement. Above 40 <br />percent, the risk would be severe for both increasing of in-channel sediment <br />movement and adjustmen1;s to channel morphology. <br /> <br />Summary . 13 <br /> <br />" <br /> <br />