Alternate title

Shallow boreholes

Date ( Publication )

2015-07-30

Identifier

7d4d5090-8b18-4c30-a07a-9d738039112f

Purpose

Most of the present knowledge about the subsurface of the Netherlands comes from boreholes drilled over the past hundred years. Since in most places in the country the subsurface is characterised by thick upper units of unconsolidated gravel, sand, clay and peat, we are routinely able to sample to depths of more than 100 metres, using relatively light drilling equipment. We have a large amount of sample material, including some from much greater depths that has been collected with heavier equipment. The borehole log provides a written record of samples from the drilled part of the subsurface in terms of successive layers of sediment and rock. Drilling can be done in two ways: using muscle or machine. Depending on the composition of the soil and subsoil, we can use a hand drill to drill down to a depth of around twelve metres. Mechanical drilling can reach a depth of around 100 metres (bailer method) or several hundred metres (suction method). A single borehole can take several days to complete. Casing is commonly used to keep these deep boreholes from caving in. Boreholes may be fitted with filters to measure groundwater levels and groundwater quality.

Maintenance and update frequency

asNeeded As needed

GEMET - INSPIRE themes, version 1.0

• Geology

GEMET - Concepts, version 3.1

• hydrogeology , measurement

Keywords

• Boreholes

Use constraints

otherRestrictions Other restrictions

Other constraints

no conditions apply

Access constraints

otherRestrictions Other restrictions

Other constraints

no conditions apply

Classification

Unclassified

Spatial representation type

vector Vector

Distance

10  m

Metadata language

eng English

Topic category

• Geoscientific information

Distribution format

• Geology GML Application Schema (version 3.0 )

OnLine resource

GDN.GeologischBooronderzoek  

OnLine resource

gdn.GeologischBooronderzoek  

Hierarchy level

Dataset

Statement

Information from the DINO database, TNO Geological Survey of the Netherlands

Metadata

File identifier

6c1cf452-8c62-4046-99ab-640a5e184f9c   XML

Metadata language

eng English

Character set

utf-8 UTF8

Hierarchy level

dataset Dataset

Date stamp

2021-02-15

Metadata standard name

ISO 19115/INSPIRE_TG2/CZ4

Metadata standard version

2003/cor.1/2006