Laserfiche WebLink
<br />002315 <br /> <br />saline SWARM cell to the hypolimnion that set the stage for the series of floods. Lake levels were <br /> <br />already high preceding the 1983 flood, about 5 meters short of full pool. <br /> <br />In 1983, the lake reached full pool by June 8th, bitt it was nearly a month before the inflows <br /> <br />peaked. on July 1st. The spillways were opened on June 2nd to be followed by theriv.er.outlet ._ ~ <br /> <br />works on June 7th. Cavitation and erosion within the spillway tunnels lead to their shutdown on <br /> <br />August 1 st, and it was August 11 th before the jet tubes were shut down. The reservoir appeared to <br /> <br />be poised for a deeply centered hypolimnetic overflow (or interflow) previous to the flood. <br /> <br />Through the course of the withdrawals from all 3 depths, a pattern of equi-potential flow-through <br /> <br />overrides the interflow pattern. We use the term equi-potential flow-through to describe the <br /> <br />conditions that accompany high discharges through multiple outlets. The resulting horizontal <br /> <br />stratification pattern is characterized by weak vertical thermal and chemical gradients that are <br /> <br />relatively uniform from the inflow to the dam. It is assumed velocities across the reservoir are <br /> <br />relatively homogeneous as they approach the dam. Hence, the SWARM cell of the hypolimnion is <br /> <br />almost entirely eliminated by the end of summer, leaving a small isolated cell of the cold <br /> <br />FRESCO cell in front of the dam. <br /> <br />Table 2: Lake Powell inflow, outflow, spillway and jet tube operations, and lake elevations <br />for selected years. <br /> <br /> Rank Dam <br />Water Inflow- of Flood Releases Spillways: Jet Tubes: Max <br />Year MAF (out of MAF MAF, % Total MAF,% ofTotal Lake <br /> 33 yrs) Elev-ft <br />1965 14.30 9 10.82 0% 4.2 MAF, 40% 3533.9 <br />1973 15.64 5 10.11 0% 0% 3646.2 <br />1979 14.64 8 8.30 0% 0% 3684.8 <br />1980 13.22 12 10.91 0% 0% 3700.6 <br />1983 20.83 2 17.49 1.9MAF, 11% 1.8 MAF, 11% 3708.3 <br />1984 21.68 1 20.50 0.1 MAF, 1% 2.6 MAF, 12% 3702.5 <br /> <br />03/06/98 <br /> <br />DRAFT <br /> <br />Page 39 of 62 <br />