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WWRC 94-21
HYDROLOGY in the Glacier Lakes Ecosystem Experiments Site

Abstract

Three Parshall flumes were installed within East and West Glacier Lakes watersheds during the summer of 1987. Each Parshall flume was prefabricated fiberglass construction fitted with a hypolon liner to bring as much groundwater flow as possible to the surface so that it could be measured by passing the water through the flume. The liner was buried as deep as was practical in front of the flume and to the sides of the flume for as reasonable a distance as was possible to intercept groundwater moving through the area. Some difficulty was encountered in burying the liner at all locations because of large boulders that could not be removed without substantial disturbance.

East Glacier Lake outlet was fitted with a 12-inch Parshall flume and associated stilling well, monitoring equipment, and shelter. Meadow Creek and Cascade Creek inlets to West Glacier Lake were both fitted with 9-inch Parshall flumes and associated stilling wells, recorders, and shelters. An 18-inch Parshall flume had been installed on the West Glacier Lake outlet in 1986. Plexiglass 90 V-notch weirs were fabricated to fit into the Parshall flumes for low flow measurements during the flow season. It was felt that the accuracy gained in measuring flow using the V-notches provided questionable additional accuracy because of substantial fluctuations in flow during the day and ice conditions occurring at night during the fall. V-notches were not used after 1988.


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