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<br />UPPER BASIN RESERVOIRS <br />FONTENELLE RESERVOIR <br />(GREEN RIVER) <br /> <br /> <br />Water Year 1986 <br /> <br />The water year 1986 plan of operation for Fontenelle <br />Reservoir was to maintain the water surface elevation as near <br />as possible to 6,443 feet. This elevation restriction was <br />imposed due to ongoing modification work to correct <br />excessive seepage from the reservoir. <br /> <br />The J an U3rY I, 1986, forecast of April through July runoff was <br />131 percent of averagc but by May 1, the forecasted inflow had <br />increased to 161 percent of average. The elevation nf <br />Fontenelle Reservoir was maintained near 6,443 Ceet until' <br />May 31, by matching releases with inflow. The June 1, 1986, <br />forecasted inflow had increased again, up to 1,450,000 <br />acre-feet or 173 percent oC average, and inflows increased <br />rapidly over the next few days as the spring runoff began. On <br />June 3-6, the rise in reservoir elevation was averaging 5 feet <br />per day as inflow exceeded the release capacity of the outlet <br />works. Releases'started to decrease on June 8, due to large <br /> <br />ACTIJAL RELEASES <br /> <br />WY 1986 <br /> <br />1000 CF!! <br />" <br /> <br /> <br />" <br /> <br />10 <br /> <br />. <br /> <br />. <br /> <br />, <br /> <br />. <br />ONDJFMAMJJASO <br /> <br />amounts of debris brought into the reservoir with the high <br />runoff whicb collected around the outlet works. After <br />temporarily shutting down releases for removal of debris Crom <br />the intake structures, maximum releases of 12,500 cfs were <br />obtained on June 18, and were sustained for the remainder oC <br />the month of June. Fontenelle Reservoir reached a peak <br />elevation of 6,494.95 feet on June 21-22, and the peak inflow <br />occurred on June 8,1986, at 20,130 cfs. <br /> <br />The actual April through July runoff into Fontenelle <br />Reservoir was 1,670,000 acre. feet which was 200 percent of <br />average. Inflow for the entire water year 1986 was 2,194,000 <br />acre-feet or 184 percent of average. The total release from <br />Fontenelle Dam for water year 1986 was 2,186,000 acre-feet. . <br />Since the reservoir level was below the minimum power <br />elevation for most of the year, the powerplant at Fontenelle <br />was not used during water year 1986. <br /> <br />FONTENELLE RESERVOIR <br /> <br />Reservoir <br /> <br />Acre-feet <br /> <br />Elevation, feet <br /> <br />Maximum Storage <br />Rated Head <br />Minimum Power <br />Surface Area, full <br />Reservoir Length, full <br /> <br />344,834 <br />233,789 <br />194,%2 <br /> <br />6,506 <br />6,491 <br />6,485 <br />8,058 Acres <br />18 Miles <br /> <br />Powerplant <br /> <br />Number of Units <br />Total Capacity <br /> <br />1 <br />10,000 KW <br /> <br />5 <br />