CCWP Highly Vulnerable Aquifers

Polygon file displaying CTC's TRSPA Highly Vulnerable Aquifers (HVA). These areas are more susceptible to contamination moving from the surface into the...

Entity Name: SW Highly Vulnerable Aquifer

Table Name: SW_HIGHLY_VULNERABLE_AQUIFR_FT

An underground water supply, or aquifer, that can easily be contaminated because overlaying soil layers are thin or permeable.

ATTRIBUTE/COLUMN NAME

DATATYPE

REQ

DESCRIPTION

HVA_ID

HVA_ID

NUMBER(12)

Yes

A unique numeric identifier assigned to each feature.

Source Protection Area ID

SPP_ID

NUMBER(2)

Yes

Identifier for the source protection area that provided the original data about the feature. SPP_ID values range from 0 to 48 chosen from Lookup Table: SOURCE_PROT_AREA_LIST.

SHAPE

SHAPE

SDO_GEOMETRY

Yes

Geometry attribute.

The CTC selected an advanced Aquifer Vulnerability Index (AVI) approach to delineate HVAs. This approach uses the interpreted products of geological and numerical models (three dimensional geologic layers) produced for the study area. Estimates of vertical and horizontal flow directions and flux are also considered. This advanced AVI approach is approved by the province. The AVI method produces a numerical index representing the relative vulnerability of an aquifer, based on the type and thickness of the soil above. The index quantifies the natural vulnerability of aquifers to sources of contamination at or near the surface, and through a translation process, categorizes groundwater vulnerability as high, medium, or low. The groundwater vulnerability is then converted into a vulnerability score, adn this score provides the ultimate expression of the groundwater vulnerability. Each aquifer is scored separately. The vulnerability of deeper aquifers take into account the protection afforded by overlying materials (aquifers and aquitards).

According to the AVI methodology, an area with a vulnerability score of 6 has a 'high' groundwater vulnerability and is therefore an HVA.

Datasets available for download

Additional Info

Field Value
Last Updated May 19, 2026, 16:32 (UTC)
Created May 19, 2026, 16:32 (UTC)
Domain / Topic
Domain or topic of the dataset being cataloged.
Title
Title for the Dataset.
CCWP Highly Vulnerable Aquifers
Description
A description of the dataset.

Polygon file displaying CTC's TRSPA Highly Vulnerable Aquifers (HVA). These areas are more susceptible to contamination moving from the surface into the...

Entity Name: SW Highly Vulnerable Aquifer

Table Name: SW_HIGHLY_VULNERABLE_AQUIFR_FT

An underground water supply, or aquifer, that can easily be contaminated because overlaying soil layers are thin or permeable.

ATTRIBUTE/COLUMN NAME

DATATYPE

REQ

DESCRIPTION

HVA_ID

HVA_ID

NUMBER(12)

Yes

A unique numeric identifier assigned to each feature.

Source Protection Area ID

SPP_ID

NUMBER(2)

Yes

Identifier for the source protection area that provided the original data about the feature. SPP_ID values range from 0 to 48 chosen from Lookup Table: SOURCE_PROT_AREA_LIST.

SHAPE

SHAPE

SDO_GEOMETRY

Yes

Geometry attribute.

The CTC selected an advanced Aquifer Vulnerability Index (AVI) approach to delineate HVAs. This approach uses the interpreted products of geological and numerical models (three dimensional geologic layers) produced for the study area. Estimates of vertical and horizontal flow directions and flux are also considered. This advanced AVI approach is approved by the province. The AVI method produces a numerical index representing the relative vulnerability of an aquifer, based on the type and thickness of the soil above. The index quantifies the natural vulnerability of aquifers to sources of contamination at or near the surface, and through a translation process, categorizes groundwater vulnerability as high, medium, or low. The groundwater vulnerability is then converted into a vulnerability score, adn this score provides the ultimate expression of the groundwater vulnerability. Each aquifer is scored separately. The vulnerability of deeper aquifers take into account the protection afforded by overlying materials (aquifers and aquitards).

According to the AVI methodology, an area with a vulnerability score of 6 has a 'high' groundwater vulnerability and is therefore an HVA.
Tags / Keywords
Keywords/tags categorizing the dataset.
Format (CSV, XLS, TXT, PDF, etc)
File format of the dataset.
Dataset Size
Dataset size in megabytes.
152.0
Metadata Identifier
Metadata identifier – can be used as the unique identifier for catalogue entry
Published Date
Published date of the dataset.
2021-03-23
Time Period Data Span (start date)
Start date of the data in the dataset.
Time Period Data Span (end date)
End date of time data in the dataset.
GeoSpatial Area Data Span
A spatial region or named place the dataset covers.
Field Value
Access category
Type of access granted for the dataset (open, closed, service, etc).
public
License
License used to access the dataset.
License not specified
Limits on use
Limits on use of data.
Location
Location of the dataset.
https://trca-camaps.opendata.arcgis.com/datasets/camaps::ccwp-highly-vulnerable-aquifers
Data Service
Data service for accessing a dataset.
Owner
Owner of the dataset.
jason.tam
Contact Point
Who to contact regarding access?
Conservation Ontario
Contact Point Email
The email to contact regarding access?
[email protected]
Publisher
Publisher of the dataset.
Conservation Ontario
Publisher Email
Email of the publisher.
Author
Author of the dataset.
jason.tam
Author Email
Email of the author.
Accessed At
Date the data and metadata was accessed.
2025-03-21
Field Value
Identifier
Unique identifier for the dataset.
951967d0327d4322a942560c8b325030
Language
Language(s) of the dataset
English
Link to dataset description
A URL to an external document describing the dataset.
https://trca-camaps.opendata.arcgis.com/datasets/camaps::ccwp-highly-vulnerable-aquifers
Persistent Identifier
Data is identified by a persistent identifier.
Globally Unique Identifier
Data is identified by a persistent and globally unique identifier.
Contains data about individuals
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Contains data about identifiable individuals
Does the data hold identifiable data about individual?
Contains Indigenous Data
Does the data hold data about Indigenous communities?
Portal Type
Platform type of the source portal.
Field Value
Version
Version of the datatset
None
Source
Source of the dataset.
None
Version notes
Version notes about the dataset.
Is version of another dataset
Link to dataset that it is a version of.
Other versions
Link to datasets that are versions of it.
Provenance Text
Provenance Text of the data.
Conservation Ontario
Provenance URL
Provenance URL of the data.
Temporal resolution
Describes how granular the date/time data in the dataset is.
GeoSpatial resolution in meters
Describes how granular (in meters) geospatial data is in the dataset.
GeoSpatial resolution (in regions)
Describes how granular (in regions) geospatial data is in the dataset.
Field Value
Indigenous Community Permission
Who holds the Indigenous Community Permission. Who to contact regarding access to a dataset that has data about Indigenous communities.
Community Permission
Community permission (who gave permission).
The Indigenous communities the dataset is about
Indigenous communities from which data is derived.
Field Value
Number of data rows
If tabular dataset, total number of rows.
56
Number of data columns
If tabular dataset, total number of unique columns.
5
Number of data cells
If tabular dataset, total number of cells with data.
280
Number of data relations
If RDF dataset, total number of triples.
Number of entities
If RDF dataset, total number of entities.
Number of data properties
If RDF dataset, total number of unique properties used by the triples.
Data quality
Describes the quality of the data in the dataset.
Metric for data quality
A metric used to measure the quality of the data, such as missing values or invalid formats.

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