Measuring the standing water level in a water bore

Measuring the standing water level in a water bore


Your water bore is a valuable asset. It
is recommended that you measure and record the standing water level in your
bore at least once a month. The easiest most accurate to take a standing
water level reading for a bore that is equipped is to measure it with a fiberglass tape
measure and a plopping tool. As you lower the tape measure into the bore you’ll
hear the plop as it hits the water. It is important to record the measurement for
comparison against future readings. A simple method of measuring the standing water level in a pumped board is to use an airline this involves removing the
pump and securely attaching one end of a high pressure airline to the
pump column then attaching a valve stem arrangement and pressure gauge to the
other end of the airline at the surface. Air is pumped into the airline to displace
any water and the gauge measures the height of the water above the bottom of
the airline. When installing an airline always use a high-pressure airline and
good quality duct tape. This way the airline will remain in place and last in good
condition for many years. Attach the bottom of the airline about
one metre above the pump element .This ensures it is clear of the turbulence
caused when the pump starts up. Attach the airline to the pump column with duct
tape firstly with five reps of duct tape
around the end of the airline and then five wraps to attach the airline to the
pump column. This particular pump is submersible but the same installation
method can be used for other types of pumps. Secure the airline to the pump column about every three metres back to the top of the pump column It is important to record the exact
measurement from the bottom of the airline to the reference point. The
reference point is usually the top of the bore casing. Before reinstalling the
pump take a manual standing water level reading using a tape measure and plopper. Make sure you record this measurement. Install the pressure gauge in a vertical
position so that you can read the gauge easily. Use good quality thread tape to
ensure there are no leaks of the joints of the airline. Any leaks in the airline
setup will give a false reading and will result in the calculation of an
incorrect standing water level reading. If possible, the bore should be shut off
for at least 12 hours before taking a standing water level reading. This gives
the bore time to recover. Record the actual time and date the bore is shut off
and the actual time the measurement is taken. It is essential to expel any water
from the airline before taking a water level reading. Using compressor or even a
simple hand pump. Pump until the needle on the pressure gauge no longer shows
any increase in pressure. The pressure gauge reading is 14 metres of water. This means there are 14 metres of water
over the bottom of the airline. Make sure you record this measurement. To calculate the standing water level, take the pressure gauge reading in metres, from the
depth that the airline is set to. In this case, the airline is set at 50 meters
below the reference point and the pressure gauge reading is 14
metres. So the standing water level is 50-14, which equals 36 metres below the
reference point. Check the calculated standing water level reading against the
manual measurement. Now record the standing water level on a record sheet.
If you make sure you write down your standing water level measurements on
record sheet then it will be easy to check on any changes over time

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