700-Bubbler-Man Rev 12 13 Feb 2020
Page 43/51
B.3 DATA INDICATORS
Prove the line: Use a 5-gallon bucket of
water and a length of orifice line
(approximately 5 feet) attached to the
Bubbler. Take some readings. If the
readings are correct, a line blockage is
indicated.
1) Ensure the orifice line termination is
free from silt/obstructions.
2) Use a wire to ream the orifice line
termination.
3) Inspect line run for possible
blockage points (break in the
conduit/compressed areas).
A) Draw Down: caused by reduced
depth of water on the downstream
side of obstructions (bridge piers,
boulders etc.). Often accentuated
during periods of increased flow
and debris accumulation.
B) Fittings Leak
Note: In cold weather fittings can
shrink, causing a leak. Cold
weather leaks are often indicated
by low readings during cool periods
followed by accurate readings
during warm periods later in the
day.
C) Spliced line leak
Move the orifice line termination to a
calm area.
1) All fittings should be attached using
Teflon tape to maintain tight seal.
2) Tighten all fittings and connection
points.
1) Spliced lines should be replaced.
2) If unable to replace spliced line, take
measures to repair the integrity of
the splice.
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