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<br />UPPER BASIN RESERVOIRS <br /> <br />FONTENELLE RESERVOIR <br />(GREEN RIVER) <br /> <br /> <br />Water Year 1988 <br /> <br />The water year 1988 plan of operation for Fontenelle <br />Reservoir was to maintain the water surface elevation as near <br />as possible to 6,443 feel. This elevation restriction was <br />imposed due to ongoing modification work to correct <br />excessive seepage from the reservoir. <br /> <br />The January 1, 1988 forecast of April through July runoff was <br />750,000 acre-feet, or 89 percent of the long-term average. The <br />forecast continued to decline through the spring runoff until <br />on June I, it was 510,000 acre-feet, or 61 percent of average. <br />This low forecast was a result of the dry weather pattern of <br />persistent high pressure zones over the western states <br />resulting in split jet flows forcing most of the winter storms <br />north into Canada and south of the Colorado River Basin into <br />the southern states areas. With the combination of below <br />average runoff and releases matching inflows, the reservoir <br />elevation at Fontenelle was maintained near 6,443 feet <br />throughout water year 1988. <br /> <br />ACTUAL RELEASES <br /> <br />WY 1988 <br /> <br />tlOO cra <br />. <br /> <br />. <br /> <br /> <br />. <br /> <br />. <br /> <br />NDJFMAMJJASO <br /> <br />The last of March and early April reservoir inflows started to <br />increase as the spring runoff began and releases were <br />increased to maintain the desired reservoir elevation. <br />Maximum releases of 4,500 cfs were obtained on May31, June <br />1, and June 10, as the inflow into the reservoir peaked at 4,524 <br />cfs on June 7. Fontenelle Reservoir reached a peak elevation <br />of 6444.1 feet on April 16, 1988. <br /> <br />The actual April through July runoff into Fontenelle <br />Reservoir was 401,000 acre, feet which was 48 percent of <br />average. Inflow for the entire water year 1988 was 659,000 <br />acre-feet or 55 percent of average. The total release from <br />Fontenelle Dam for water year 1988 was 652,000 acre,feeL <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 1988. <br /> <br />FONI'ENELLE 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 />194,962 <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 />