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The properties of each individual layer are precisely recorded in the catalogue. This includes information on colour, grain size, consistency, moisture content and other characteristic features. Equally important are the depth details that mark the beginning and end of the layer. This creates a precise picture of the vertical structure, which remains comparable regardless of the drilling method. The organised structure makes it possible to depict even complex soil conditions in a comprehensible way.

A complete strata catalogue not only provides a snapshot of the drilling point, but also creates the basis for technical decisions. Engineers use it to select suitable construction methods, determine foundation depths or assess risks. At the same time, environmental experts benefit as information about possible pollutant layers or groundwater behaviour becomes visible. In research, it allows conclusions to be drawn about geological developments and the history of a region.

The care taken in the preparation has a direct impact on the usability of the bore log. Only if the information is consistent, detailed and comprehensible can it be used reliably by experts. The strata catalogue is therefore much more than just documentation - it forms the foundation for all further steps that are based on reliable knowledge of the subsoil.

DIN 4022 and DIN 4023, which contain specifications for the description and presentation of geological strata, are particularly relevant for stratigraphic logs. They ensure that geological findings remain comparable regardless of person and project. Internationally, ISO 14688, provides uniform standards for classifying and naming soils. These regulations ensure that strata catalogues are technically reliable, comprehensible and can be used across regions. This ensures comparability across national borders.

The representation is usually a vertical section in which each layer is clearly identified by symbols, hatching or colours. Depth information at the layer boundaries enables the exact location in the subsurface to be assigned. This creates a visual overview that allows quick orientation, independent of extensive texts. The drilling profile thus becomes an indispensable tool for geological documentation.

In practice, the drilling profile supports engineers, geologists and experts in evaluating the subsoil. It provides information on the load-bearing capacity, groundwater conditions or special risks and facilitates the selection of suitable construction methods. It is also an easy-to-understand basis for clients or authorities to make comprehensible decisions. It thus combines technical precision with a high degree of clarity.

The drilling profile also plays an important role in research. It allows conclusions to be drawn about the formation history of a region, documents geological processes and creates comparability between different locations. In environmental and hydrogeology in particular, it provides crucial information about the layer structure and possible water pathways. The drilling profile thus adds scientific value to its purely technical use.

The creation of drilling profiles is subject to established norms and standards to ensure uniformity and comparability. In particular, DIN 4023 (drilling profile), which regulates the graphical representation, and DIN 4022 (soil and rock characterisation) for the uniform description of layers. In addition, international standards such as ISO 14688 are used to name and classify soils. These standards ensure that drilling profiles can be understood in the same way regardless of location and time.

The contents of a drilling log are wide-ranging. In addition to the equipment and methods used, the start and end of drilling and the depth reached are documented. The drilling progress, special technical features, flushing fluids or aids used and any faults that occur are also recorded. This comprehensive collection of information allows the working conditions and results to be reconstructed exactly.

In practice, the drilling log serves a variety of purposes. It provides an important basis for clients and engineers to make decisions about construction methods, safety measures and costs. At the same time, it serves as legal proof that the work has been carried out properly. Authorities can use the log to check compliance with regulations, while experts use it to back up their assessments.

In addition, the drilling log also provides valuable services in research. It not only documents the results, but also the circumstances under which they were obtained, which is crucial for the comparability and reproducibility of data. It therefore helps to make geological investigations permanently verifiable and scientifically usable. It unfolds its full value especially in combination with the stratigraphic log and drilling profile.

Standards are used to standardise the content and format of drilling logs. DIN 4021,, which regulates the documentation of boreholes and the structure of logs, should be emphasised. It is supplemented by DIN 4022,, which specifies a systematic description of soil and rock types. ISO 22475, which defines standards for geotechnical exploration, sampling and groundwater measurements, is of international importance. These standards ensure that drilling logs remain standardised, comparable and technically reliable.