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<br />0017-'t7 <br /> <br />24 <br /> <br /> 40 <br /> .......- 2001 <br /> - 2002 <br />... --- 2003 <br />Q) <br />> <br />0 30 <br />0 <br />Q) <br />> <br />:,j::::; <br />J! <br />Q) 20 <br />C) <br />~ <br />- <br />C <br />Q) 10 <br />~ <br />Q) <br />a.. <br /> 0 <br /> 10 20 30 40 50 60 <br /> Stage (kcfs) <br /> <br /> <br />Figure 1.4. Percent vegetative cover at five stage elevation zones between 2001 and 2003. <br />Vertical bars represent +/- 1 standard error. Cover has declined in all zones since 2001. <br />Discharge had the greatest affect on stages from 35k cfs to 15K cfs. Overall vegetation cover <br />within the riparian zone is not dense, though cover is greatest at the 25k cfs zone which <br />corresponds with areas utilized for camping. <br /> <br />differentially. Operations had a significant affect at stages up to 35k cfs, while climate affected <br />plants at higher discharges (see figure above from Kearsley et aI., 2003). Since 2002 cover has <br />declined below 25k stage level possibly as a result of scour associated with winter fish <br />suppression flows (5-20k cfs daily), or as a result of June - August discharges that reached peaks <br />of 18k cfs. Vegetation is sampled in September and it is likely that cover values at the 15k cfs <br />level are associated with summer discharge patterns. The mean wetland score, which most <br />closely tracks operational effects on vegetation and available groundwater, showed no change <br />within zones between years, but an increase in value for all zones compared to 2001 (Kearsley et <br />aI., 2002). Again these scores may be associated with either winter or summer discharge <br />patterns. Repeat data collection would determine how these cover and wetland values may be <br />trending relative to climatic and operational changes over time, and illustrates the value of <br /> <br />GCMRC FY2006 Annual Work Plan (Draft February 15,2005) <br />