DRASTIC Aquifer Intrinsic Vulnerability

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Published by the Ministry of Environment and Climate Change Strategy - Water Protection and Sustainability
Licensed under Open Government Licence - British Columbia

Spatial dataset of DRASTIC aquifer intrinsic vulnerability of groundwater for specific study areas in BC, as reported in technical summary reports which are made available through the BC government's Ecological Reports Catalogue (EcoCat).
For the study areas covered by each report and a link to each report in EcoCat, please see the EcoCat Reports Index spatial dataset: https://catalogue.data.gov.bc.ca/Geographic/drastic-aquifer-intrinsic-vulnerability-reports-index

For more information (including an explanation of the DRASTIC method) please see "A Guide to the Use of Intrinsic Aquifer Vulnerability Mapping" at http://a100.gov.bc.ca/pub/acat/public/viewReport.do?reportId=23346

Data and Resources

Dataset Extent

Latitude: 48.0° to 60.0°
Longitude: -139.5° to -113.5°

Additional Information


Spatial layer intended to describe the intrinsic vulnerability of the groundwater.

Data Quality
Lineage Statement

More Information

Contact Information

NameMike Wei (businessExpert)
OrganizationMinistry of Environment and Climate Change Strategy
Sub-OrganizationWater Protection and Sustainability

Access & Security

Who can view this dataset? Public
Who can download this dataset?Public

Metadata Information

Record Published 2011-03-09
Record Last Modified 2019-05-04
Resource Status onGoing

Object Description


Comments: Aquifer vulnerability is a spatial layer that describes the intrinsic vulnerability of the groundwater. Intrinsic vulnerability means that it is based on hydrogeologic characteristics alone and does not consider the existing type of land use or nature of the potential contaminants. In assessing an aquifer's vulnerability, the contaminant is assumed to be introduced at, or very near, the land surface. The methods used to describe vulnerability include: DRASTIC and Aquifer Vulnerability Index (AVI). This spatial layer has polygonal features.

Column Name Short Name Data Type Data Precision Comments
AQUIFER_VULNERABILITY_ID AV_ID NUMBER 10 AQUIFER VULNERABILITY ID is a sequential business key maintained by the system starting at 1.
VULNERABILITY_VALUE VLNR_VALUE NUMBER 4 The VULNERABILITY VALUE is a calculated number based on the DRASTIC methodology used to assess groundwater pollution potential. Vulnerability values range between 23 and 230.
VULNERABILITY_CLASS VLNR_CLASS VARCHAR2 12 The VULNERABILITY CLASS is a categorization of the VULNERABILITY VALUE and includes three classes - Low, Moderate and High. For example, the low category includes Vulnerability Values from 23 to 100.
FEATURE_CODE F_CODE VARCHAR2 10 FEATURE CODE contains a value based on the Canadian Council of Surveys and Mapping's (CCSM) system for classification of geographic features.
GEOMETRY GEOMETRY SDO_GEOMETRY 1 GEOMETRY is the column used to reference the spatial coordinates defining the feature.
OBJECTID OBJECTID NUMBER 38 OBJECTID is a required attribute of feature classes and object classes in a geodatabase.
SE_ANNO_CAD_DATA BLOB 4000 SE_ANNO_CAD_DATA is a binary column used by spatial tools to store annotation, curve features and CAD data when using the SDO_GEOMETRY storage data type.
FEATURE_AREA_SQM NUMBER 19 FEATURE_AREA_SQM is the system calculated area of a two-dimensional polygon in square meters
FEATURE_LENGTH_M NUMBER 19 FEATURE_LENGTH_M is the system calculated length or perimeter of a geometry in meters


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