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Test Trenches
Test trenches remain an important and reliable method for verifying the presence of cables and pipes in the ground. While detection techniques provide insight, test trenches offer practical confirmation. This results in a complete and reliable picture of the situation.
Test trenches:
thorough inspection of cables and pipes
Although TerraCarta uses advanced detection techniques, test trenches remain a reliable method for locating and verifying underground cables and pipes. These trenches are often dug by hand, but for longer trenches we use excavators. Our survey teams are fully equipped with the appropriate excavation equipment, and we always obtain the necessary permits and file the required notifications when needed. Once the trench has been dug and the survey completed, the trench is carefully backfilled and the pavement neatly restored. We document the original condition with photographs, as well as the condition in which we leave the site.
curious about the possibilities?
Custom Test Trench
for clients
In addition to digging test trenches for our own projects, we also carry out assignments for external clients. In doing so, we go a step further by geodetically mapping the trench. The trench’s length and findings are digitally recorded and analyzed. An innovative addition is our use of photogrammetry, which allows us to create 3D models and orthophotos. This makes it immediately clear whether the data from the trench matches the theoretical information.
Combined trial slot-
and detection research
A combined approach using test trenches and detection surveys almost always provides a complete picture of the underground infrastructure. This result can be displayed in 2D maps or 3D environments, with the detection results corroborated by 3D models of the test trenches.
Verification and Deployment
from test trenches
TerraCarta uses test trenches specifically to verify previously conducted detection surveys. This allows assumptions to be checked and provides a reliable and complete picture of the subsurface. In some situations, test trenches also serve as evidence, for example, when a cable or pipeline is not located at the site as indicated in the KLIC notification. In such cases, it can be demonstrated that the available information differs from reality.
Thanks to our experience, test trenches are dug strategically. Based on measurement results, we can extend a trench if a detection is made further down the line, or reduce its size if it is appropriate to do so. This ensures an efficient workflow and increases the accuracy of the investigation.
Test holes, technique
and regulations
In addition to test trenches, TerraCarta uses test holes, particularly when the location and depth of cables and pipes are already largely known. In many cases, minimal disruption—such as lifting a single paving stone—is sufficient to locate a pipeline. We use augmented reality to visually identify the exact position.
During implementation, we take into account applicable laws and regulations, such as the guidelines from CROW Publication 400 for work in contaminated soil. TerraCarta is fully familiar with these requirements and, if necessary, can adjust the planning and implementation through our TerraCarta Environment department.