WWRC 94-21
HYDROLOGY in the Glacier Lakes Ecosystem Experiments
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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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