The depth of a geological boundary below ground level.

The average thermal gradient within a given depth interval.

Zones, where rocks have been broken and displaced. Faults, which may cause geotechnical problems while drilling or problems with cementation for closed loop systems.

Site with proven contamination of the underground.

Any subsurface installations, which might lead to conflicts with drilling wells and borehole heat exchangers.

Areas with rocks susceptible to karstification

Uncontrolled landfill or major dumpsite with suspicion or recorded hazardous substances in substantial amounts

Site which due to its use bears the risk of potentially contaminating the underground.

Patterns of magnetic anomalies attributable to rock magnetism.

Extracted water volume per hour and meter drawdown for a defined well diameter.