FLOOD06466

• County: Statewide
• Basin: Statewide
• Title: Techniques of Water-Resources Investigations of the US Geological Survey Discharge Measurments at Gaging Stations
• Date: 1/1/1969
• Prepared By: USGS
• Floodplain - Doc Type: Educational/Technical/Reference Information

18

TEC~IQUES OF WATER-RESOURCES INVESTIGATIONS

Figure 26.-Power unit for sounding 'HI.

Equipment assemblies
Special equipment is necessary for each type
of current-meter measurement. The meters,
weights, and reels used have already been
described. The additional equipment needed is
described in this section.
The special equipment assemblies have been
divided into five basic groups: cableway, bridge,
boat, ice, and velocity-azimuth-depth-assembly
(V ADA) equipment.
Cablewoy equipmli!:nt
The cableway provides a track for the opera-
tion of a cable car from which the hydrog-
rapher makes a current-meter measurement.
Cable cars also support the sounding reel and
other necessary equipment. Both sitdown and
standup types of cable cars are used in stream
gaging. (See figs. 34-36.) Pierce (1947) describes
plans for both types. Normally, sitdown cars

are used for cableway spans less than 400 feet
and where lighter sounding weights are used.
The standup car is used on the longer spans and
where heavy sounding weights are needed.
The cars are moved from one point to another
on the cableway by means of cable-car pullers.
(See fig. 37.) The standard car puller is a cast
aluminum piece with a snub attaehed. The
snub, usually four-ply belting, is placed be-
tween one of the car sheaves and the cable to
prevent movement of the car along the cable.
A second-type puller is used when a car is
equipped with a follower brake. (See fig. 37.)
A third type, the Colorado River cabllHlar
puller, is the same in principle as the puller
used on cars equipped with a follower brake.
Power-operated cable cars are available for
extremely long spans or other special situations.
(See figs. 38-39.)

,
1