AQUASCOPE 3
Version 1.3
10/19
Fig.23 Method of Pin Poin ting with a Geophone
In clay soils there maybe 2 high readings with a lower reading in
between due to the water leak created a cavity and the water hitting the
walls of the cavity.
6. How to find leaks with the AQUASCOPE 3
Geophone
The ground microphone is a pinpointing tool that is used to find leaks
under sealed surfaces. It has more sensitivity than the tripod foot
which is an advantage in finding leaks in deeper pipes but a
disadvantage finding leaks in good noise conductors like concrete slab.
It should always be placed or held in a still position during operation.
1. Localise the leak position with noise loggers or an electronic listening
stick. If a Correlator is available this can be used to narrow down the
location to a much smaller area.
2. It is best practice to locate the pipe position with a pipe locator.
3. Follow the path of the pipe listening for the leak at 1 meter
intervals. Each sample should last long enough to capture a minimum
noise value, typically 20 to 30 seconds.
4. When the location with the highest minimum noise has been identified
use your leakage experience to confirm this is a leak noise.
5. Perform a “star check” moving about 30 cm from this point to all 8
points of a star. Each point should have a lower noise than the pin-
pointed leak position. If a point is louder this could be the correct
position, repeat the star check to verify.
