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<br />Upper Basin Reservoirs <br />Fonlenelle Reservoir <br />(Green River) <br /> <br /> <br />Water Year 1980 <br />Fontenelle Reservoir is operated for <br />power generation, water supply, flood <br />control, 1ish and wildlife enhancement, <br />and recreation. Th~ water surface was <br />gradually reduced from an elevation of <br />6,499 feet at the beginning of the water <br />year to a low of 6.477 feet in April prior <br />to the spring runoff. The minimum release <br />during the fall and winter was 700 cubic <br />feet per second (ft3/s). The maximum <br />release for the water year was 6,975 113/s. <br />The maximum inflow of 9,715 It3/s oc- <br />curred o~ May 25, On May 26, the reser- <br />\loi,. was 1i\\ea \0 capacity with an eleva- <br />tion of 6,506 feet. The minimum release <br />for power generation is 500 ft3/S, the <br />maximum release through the powerpJant <br />is 1,750 It'/s at rated head, <br /> <br />8 <br /> <br /> <br />Fonlerlelle Oam spillway <br /> <br />Waler Year 1981 <br />At the beginning of year 19B1, the eleva- <br />tion at Fontenelle Reservoir was 6,499 <br />feet with a content 0\ 294,000 acre-teet. <br />Releases from the reservoir will be sched- <br />uled to draw the water down to 6,480 feet <br />prior to the spring runoff <br /> <br />The reservoir will fill in July 1981 unless <br />the inflow is less than average. AHer the <br />spring runoff, the reservoir level will be <br />controlled by adjusting the releases <br />through the powerplanf to reduce slowly <br />the elevation to 6,504 feet by the end of <br />the summer of 19B 1, <br /> <br />The maximum release, dependent pri- <br />marily on the magnitude of the inflow, is <br />also contingent on forecast error. Unless <br />the inflow is larger than what has been <br />historically experienced, the projected <br />maximum release is less than 15,000 fe/s. <br />It the inflow is in the upper quartile, <br />peak outflow is expected to be less than <br />10,000 lt'ls, With an average inflow, the <br />anticipated peak outflow is less than <br />7,000 fe/s. Assuming a lower quartile <br />inflow, the outfiow will probably be no <br />greater than 3,000 lt'ls, <br /> <br />,Fontenelle Active Storage' <br /> <br />Chart 1 <br /> <br />Ei.(Ft.) <br /> <br />6506 <br />6491 <br />6485 <br /> <br />Reservoir <br /> <br />(Acre-Feet) <br /> <br />344,834 <br />233,789 <br />194,962 <br />BaSil Acre. <br /> <br />Maximum Storage <br />Rated Head <br />Minimum Power <br />Surface Area (Full} <br />Reservoir length <br />(Full) <br />Power Plant <br /> <br />Number of Units <br />Total Capacity <br /> <br />18 Miles <br /> <br />1 <br />10,000 Kilowatts <br /> <br />'d089 nollnclude 563 acre-feel 01 daad storage <br />below 6406leel <br />