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Permeable sand and gravel deposits beneath the floor of the Rocky Mountain Trench in northwestern Montana and southeastern British Columbia will become saturated and provide additional storage for Libby Reservoir, which is scheduled to begin filling in 1972. Because subsurface geologic data are insufficient to predict accurately the amount of usable bank storage, plans cannot be made to use this water for project purposes. An electric analog of the area is too crude to make final estimates of bank storage, but the model study points out that the distribution of active bank storage along the reservoir is mainly a function of the size and shape of the reservoir stage hydrograph and of the slope of the floor of the reservoir. The magnitude of active bank storage is controlled by transmissivity and storage coefficient. The model study indicates that geologic data necessary to evaluate bank storage accurately need only be collected over about one-fourth of the length of the reservoir and within about 2 miles of its edge. The study allowed the estimated cost of the data collection plan to be reduced by about half.

A preliminary evaluation of bank storage associated with Libby Reservoir in northwestern Montana