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<br />f'I f:,~ ~ ')~ <br />L "~, ___.,:.;,,: I <br /> <br />Revisions to Muddv Creek Inflows: ENFL08.09A.09B.lO and 11: <br /> <br />Mean lllonthly flows, monthly flow percentage distributions, and <br />hydrographs of mean monthly flow values for initial and <br />revised Muddy Ck. inflows are attached. Inflow descriptions <br />and proposed revision methodologies follow: <br /> <br />ENFL8: natural flows to Overland Reservoir <br /> <br />Initial natural flow estimates for ENFL08 were based <br />on adjusting gaged flows at the Cow Creek nr. Paonia CO <br />(09131100) site for Overland Reservoir storage effects <br />and Overland Ditch diversions for the available period of <br />record (WY1969-1982). Extension of records was done by <br />correlation with North Fork Gunnison River nr. <br />Somerset,Co data. <br /> <br />Revised flows were derived by retaining the long term <br />yield developed from initial estimates and proportioning <br />natural flows developed for the West Muddy Ck. nr. <br />Somerset gage site (09131200) by the ratio of long term <br />yields estimated for these two sites. <br /> <br />ENFL9: Original ENFL9 values were derived by taking the <br />difference between natural flows at the West Muddy Ck. <br />nr. Somerset gage (09131200) and flows at the Overland <br />Reservoir site (ENFL8). ENFL9 was assumed to represent <br />Electric Mountain inflows. <br /> <br />.,-Becausethe. Electric Mountain site is located on West <br />:MuddyCk. abv. the confluence with Cow Ck., ENFL9 was <br />'split'into two components in order to more accurately <br />. ., . represent Electric Mountain inflows: <br /> <br />ENFL9A -- estimated virgin inflows to potential Electric <br />Mountain reservoir site: <br /> <br />-- Flow values for this inflow were estimated as 50% of <br />flows at the West Muddy Ck. nr Somerset gage site <br />(09131200)~ this percentage estimate was obtained from <br />the Water Supply Appendix of the Grand Mesa Project, <br />Colorado Feasibility Report, January 1973, Bureau of <br />Reclamation. <br /> <br />ENFL9B -- virgin flow gains between OVerland Reservoir <br />site, Electric Mountain reservoir site, and the West <br />Muddy Ck. nr. Somerset gage site: <br /> <br />derived by difference: natural flows for West Muddy <br />Ck. nr. Somerset gage minus sum(ENFL08, ENFL09A) <br />