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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 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.

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.