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Sample trenches
Test trenches remain an important and reliable method for verifying the presence of cables and pipes underground. While detection techniques provide insight, test trenches provide practical confirmation. This results in a complete and accurate picture of the situation.
Test pits:
thorough inspection of cables and pipes
Although TerraCarta has advanced detection techniques, test trenches remain a reliable method for locating and verifying cables and pipes in the subsurface. These trenches are often dug manually, but for longer trenches we use excavators. Our survey crews are fully equipped with the appropriate excavation equipment, and we always provide the necessary permits and notifications when required. Once the trench is dug and the survey conducted, the trench is carefully compacted and the pavement neatly restored. We document the original situation with photographs, as well as the condition in which we leave the site.
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Tailored trial trenches
for clients
In addition to digging trial trenches for our own projects, we also carry out assignments for external clients. Here we go a step further by recording the trench land surveying. The length of the trench and the findings are digitally stored and analyzed. An innovative addition is our use of photogrammetry, with which we create 3D models and orthophotos. This immediately reveals whether the data in the trench match the theoretical information.
Combined trial slot-
and detection research
A combined approach of trial trenching and detection surveys almost always provides a complete picture of underground infrastructure. This result can be represented in 2D maps or 3D environments, with the detection results confirmed by 3D models of the trial 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 shorten it if it is safe 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.