Specialist of underground location (number 1 of depth). Topography of caves, identification underground river

Underground location (vertical identification)

Vertical location by positionning transmitter (transmitter BPS) is the best way to locate accurately either an underground or a subaquatic cave up to 300 m deep.

Thanks to our expertise and the robustness of our transmitter, we can operate quickly and in extreme conditions.

Radius strength : 400m Deep max strength : 300m
Axial accuracy : < 0.7%
Vertical accuracy : < 0.1°
Depth accuracy : < 1.5%

What is the underground location?
How does it work?
Equipment
References and performances
Possible uses

Illustration with slides (photos and videos)
- Underground location at the spring of "Boullet" in Souillac, 130m deep, in view of spring water collection.
- Underground location in view of spring water collection for the town of Gramat (124m deep).
- Underground location in Font de Lussac (16), in view of spring water collection for the town of Angoulème. (language: french)
- Underground and subaquatic location in the siphon of the Ressel (movie, language: french)
- Marcilhac. Des transmitter radio pour trouver l'eau potable, La Dépêche, 21/11/2008. Article about a spotting made by Daniel Valade.(language: french)

What is the underground location?

The underground location is the determination of the true vertical point above ground of an underground place. The underground topography made by this way will perfectly match the surface area topography. When cavers can access the place to be located, the BPS transmitter is the more accurate process that can be used.

For more than 20 years, Daniel Valade has developed his own transmitter. Some can be used in extreme situations like subaquatic caves.

Thanks to our transmitter, we find the best position, above ground, to drill the underground location.

Surface area location
and determination of depth

How does it work?

The reciever (above ground) collects the magnetic field (signal) sent by the transmitter. A transmitter is positioned at the targeted place in a natural or artificial cave. The magnetic field is located on the top by the reciever. So an accurate point can be deternined above the ground.
This technology allows deep measurements that are more accurate than that obtained with an altimeter because the transmitter is not affected by atmospheric pressure changes.

Movie about one of the location we completed for the Conseil Général du Lot (District Counsil).

Possible uses

Finding the best drilling point (wiring, ventilation, mining, water supply, etc...)

Validate the accuracy of underground topography

Defining the best position for drilling above ground

Accurate deep measurements

Define relative locations of several caves or underground structures

Technical performances

Localization up to 250 meters deep : 800 meters diameter surface area reception

Autonomy : 4 hours

Accuracy of deep measurement : + / - 2 meters

Weight and dimension : 3 kg, can be hold in a 15 liters water tight can.

Accuracy of the location : less than 1 meter

More accurate and less expensive than topography.

A study to fit your needs

Daniel Valade company is sufficiently experienced to bring you valuable advice and help for your project.
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