Figure 17. Active hydrostations during the 1994 season

Table 8. Specifications of sensors used in water quality parameter measurements

Figure 18. Schematic of hydrostation showing layout

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xx x x xxxxx xxxx

SpriringGulllly

Figure 17. Active hydrostations during the 1994 season.

temperature of Knik Arm waters and to continu-

Truck Gully hydrostation (Fig. 16). Data were col-

ously record data from August through Septem-

lected at 5-second intervals and averaged for a 4-

ber 1993 and from May through November 1994.

minute output frequency. Wires from the sensors

At hydrostation sites, the sensors were mounted

were bundled and strung to a Campbell CR10

on a metal crossbar attached to a stake driven

datalogger, which was positioned on a floating

into the gully bed and positioned in plunge pools,

platform next to the gully (Fig. 18).

where they would remain wet at all times, at an

Each platform was constructed of a 4-ft (1.2-m)

elevation of 15 to 45 cm above the bed. Flow

square plywood deck with a wood frame made

from 2- 8-in. (~5- 20-cm) studs. Large metal

probes were mounted about 1 m above the bed

on separate stakes downstream of the plunge pool

eyehooks were screwed into the frame on each

at Spring and Parachute gullies, and on a sepa-

corner. One and one-half meter sections of 0.75-

rate crossbar in a higher position at the Bread

in. (2-cm) -diameter steel pipe were mounted ver-

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