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<br /> <br />Q <br /> <br />Effects of Surface-Water Reservoirs <br />on the Interaction of <br />Ground Water and Surface Water <br /> <br />The increase of water levels in reservoirs causes the <br />surface water to move into bank storage. When water levels in <br />reservoirs are decreased, this bank storage will return to the <br />reservoir. Depending on the size of the reservoir and the <br />magnitude of fluctuation of the water level of the reservoir, <br />the amount of water involved in bank storage can be large. <br />A study of bank storage associated with Hungry Horse <br />Reservoir in Montana, which is part of the Columbia River <br />system, indicated that the amount of water that would return to <br />the reservoir from bank storage after water levels are lowered <br /> <br />Hungry Horse Reservoir, <br />Montana <br /> <br /> <br />is large enough that It needs to be considered in the reservoir <br />management plan for the Columbia River system. As a <br />speCific example, if the water level of the reservoir is raised <br />100 feet, held at that level for a year, then lowered 100 feet, <br />the water that would drain back to the reservoir during a <br />year would be equivalent to an additional 3 feet over the <br />reservoir surface. (Information from Simons, W.D., and <br />Rorabaugh. M.I., 1971, Hydrology of Hungry Horse Reservoir, <br />northwestern Montana: U.S. Geological Survey Professional <br />Paper 682.) <br /> <br /> <br />- <br /> <br />- 1 <br /> <br /> <br />Hungry Horse Reservoir, Montana. (Photograph <br />courtesy of Hungry Horse News.) <br /> <br />70 <br />