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3/8 inches. The holes in the feet should be
matched to anchor bolts located in the foundation or on the platforms. for severely tilted
foundations, use a set of three hex nuts on each bolt to provide leveling and locking of the
rain gauge onto the foundation. For slightly tilted foundations, use the adjustable leveling
knobs above each foot to level the gauge. An internally mounted spirit level may be used to
assist in the leveling process. A rough level can be taken by placing a carpenter ’s level
across the top of the gauge funnel. Flat washers may be used as shims to help correct large
leveling differences. Place the shims under the mounting feet. A lock washer and a hex nut
should be used to secure the gauge onto the anchor bolts. Some correction of the level may
be necessary after tightening the hex nuts.
2
to
be located among trees of the same height as the tower.
2.2 Installation
OMEGA@ rain gauges are shipped as a complete assembly with no additional assembly
required. ‘The gauge, however, should be installed onto a platform or foundation that is
close to being level to minimize the amount of adjustment required after the gauge is
fairly
mounted. Each gauge is equipped with three mounting brackets that also serve as feet. Each
foot has a mounting hole with a diameter of
gauge well above the average local snow level. The exposure would be best if the
tower were
Chapter 2: Installation
2.1 Site Requirements
The location of the rain gauge is very important to the successful operation of the instrument.
The most accurate measurements are made in relatively sheltered areas protected from
gusting and turbulent winds. Openings in orchards or a grove of trees offer the best exposure
for the rain gauge. Fences and other structures can help serve as a wind break as long as
they are not too tall. In areas that are open with no nearby structures, a wind screen such is
recommended to protect against wind effects.
Generally, the heights of objects near a rain gauge should be proportional to the distance
away from the gauge. The distance of a nearby object should always be at least twice the
height of the object above the gauge.
Wind effects on catch losses are more pronounced during snow storms than during a rain
storm. A wind screen is generally not used at locations where snowfall constitutes less than
20% of the mean annual precipitation.
Good locations do not always remain free of obstructions. Vegetation can grow quickly,
changing an excellent exposure into a poor one. Sites should be inspected regularly in order
to properly maintain the exposure of the gauge.
In locations with heavy snowfall, the gauge should be mounted on a support or tower to
place the