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The list describes the layers encountered in their characteristic form. This includes information on appearance, texture and consistency, but also on special features such as odour, inclusions or differences in colour. Equally indispensable is the depth information, which defines the exact boundaries between the layers. This creates a continuous visualisation of the subsurface that remains comprehensible regardless of personal impressions.

There are many possible applications for the stratigraphic log. In civil engineering, it serves as a basis for assessing bearing capacity, groundwater conditions or possible subsidence. For environmental assessments, it provides information on the permeability and stratification of the soil, which can be decisive for the assessment of contaminated sites or groundwater movements. In geological research, on the other hand, it provides material for reconstructing historical deposits and developments.

A precise layer catalogue gives the drilling documentation its true significance. It provides a clear view of the subsurface, reduces uncertainties and creates confidence in further analyses. This makes it a key tool that plays a decisive role in the success of planning and projects.

Standards are essential to make a strata catalogue consistent and comparable. This includes DIN 4022,, which describes and standardises the approach to soils and rock. It is supplemented by DIN 4023, which is closely linked to the visualisation of layer sequences in the drilling profile. At international level, ISO 14688 ensures standardised classification and terminology. Together, these standards create the basis for transparent, technically correct and supra-regionally comprehensible documentation of drilling results.

The graphical representation is a vertical section through the borehole. Different soil types and rocks are identified by standardised colours, patterns or symbols. In addition, depth information is used to mark the beginning and end of a layer and establish the connection to the actual borehole. This creates a vivid image that concisely complements the text information and in many cases even makes it easier to understand.

In practice, the drilling profile offers numerous advantages. Engineers can use the sequence of layers to assess which construction methods are suitable and where special precautions are required. It also has an important function for environmental assessments, as the permeability of soil layers or the location of groundwater can be seen directly. Clients in turn receive a compact and easily comprehensible overview with the drilling profile.

In addition to its immediate practical use, the drilling profile also plays an important role in research. It provides data that can be used for geological reconstructions and comparative analyses. It thus contributes to scientific documentation and creates a solid basis for understanding long-term developments in the subsurface. Its value therefore lies equally in its technical and scientific application.

There are clear standards to ensure that drilling profiles are comprehensible and comparable everywhere. Particularly relevant are DIN 4023,, which sets out specifications for the presentation of drilling profiles, and DIN 4022,, which regulates the labelling of soil and rock materials. At international level, ISO 14688 supplements these standards by specifying standardised rules for naming and classifying soils. These standards ensure uniformity and guarantee that drilling profiles can be used across regions and disciplines.

Typically, a drilling log contains information on the drilling rig, drilling method, start and end of the work and the depth reached. In addition, aids such as pipework or flushing are documented, as are unexpected incidents or technical difficulties. All data is organised chronologically so that the drilling progress can be tracked. The log therefore not only provides information about the result, but also about the conditions under which it was achieved.

In the construction industry, the drilling log is an important tool for assessing the subsoil and evaluating risks. Engineers and clients can use the documentation to select suitable construction methods and realistically calculate costs. At the same time, it serves as proof for authorities and insurance companies that the work was carried out properly and in accordance with applicable standards. In cases of conflict, it provides a reliable basis for clarification.

The drilling log also plays an important role in geoscientific research. It not only provides data on the layers encountered, but also documents the technical conditions under which these were obtained. This improves comparability with other boreholes and makes scientific statements more meaningful. The drilling log thus combines the practice of civil engineering with the methodology of research.

The formal design of drilling logs is regulated in the relevant standards. The relevant standard is DIN 4021,, which provides detailed specifications for the structure and content of drilling logs. In addition, DIN 4022 applies to the standardised addressing of soils and rocks in order to ensure uniform documentation. ISO 22475, which contains guidelines for geotechnical exploration, sampling and groundwater measurements, is relevant at international level. These standards ensure that drilling logs are technically correct, comparable and legally robust.