Extreme Flow Statistics

This dataset represents estimates for single-station annual flood and low-flow frequency in the Southwestern Hudson Bay and the Nelson River watershed systems, calculated for the Water Survey of Canada’s (WSC) database called HYDAT.

This dataset represents estimates for single-station annual flood and low-flow frequency in the Southwestern Hudson Bay and the Nelson River watershed systems, calculated for the Water Survey of Canada’s (WSC) database called HYDAT.

The flood magnitude statistics can be used for applications such as flood plain delineation and design of hydraulic structures. The drought severity statistics can be used for applications such as water abstraction and effluent dilution.

Additional Documentation
 Status
 Completed: production of the data has been completed

Maintenance and Update Frequency
 Not planned: there are no plans to update the data

Contact
 Ontario Ministry of Natural Resources - GeospatialOntario, [email protected]

Datasets available for download

Additional Info

Field Value
Last Updated August 28, 2026, 08:37 (UTC)
Created March 24, 2026, 20:43 (UTC)
Domain / Topic
Domain or topic of the dataset being cataloged.
Title
Title for the Dataset.
Extreme Flow Statistics
Description
A description of the dataset.

This dataset represents estimates for single-station annual flood and low-flow frequency in the Southwestern Hudson Bay and the Nelson River watershed systems, calculated for the Water Survey of Canada’s (WSC) database called HYDAT.

This dataset represents estimates for single-station annual flood and low-flow frequency in the Southwestern Hudson Bay and the Nelson River watershed systems, calculated for the Water Survey of Canada’s (WSC) database called HYDAT.

The flood magnitude statistics can be used for applications such as flood plain delineation and design of hydraulic structures. The drought severity statistics can be used for applications such as water abstraction and effluent dilution.

Additional Documentation
 Status
 Completed: production of the data has been completed

Maintenance and Update Frequency
 Not planned: there are no plans to update the data

Contact
 Ontario Ministry of Natural Resources - GeospatialOntario, [email protected]

Tags / Keywords
Keywords/tags categorizing the dataset.
Format (CSV, XLS, TXT, PDF, etc)
File format of the dataset.
Dataset Size
Dataset size in megabytes.
0.09
Metadata Identifier
Metadata identifier – can be used as the unique identifier for catalogue entry
a386dc33d0ba44308c3d8c436aaa0d8b
Published Date
Published date of the dataset.
2020-01-24
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.
Open Government Licence – Ontario
Limits on use
Limits on use of data.
Location
Location of the dataset.
https://ontariogeohub-lio.opendata.arcgis.com/datasets/mnrf::extreme-flow-statistics
Data Service
Data service for accessing a dataset.
Owner
Owner of the dataset.
OntarioProvincialMapping
Contact Point
Who to contact regarding access?
Ontario Ministry of Natural Resources and Forestry
Contact Point Email
The email to contact regarding access?
[email protected]
Publisher
Publisher of the dataset.
Ontario Ministry of Natural Resources and Forestry
Publisher Email
Email of the publisher.
Author
Author of the dataset.
OntarioProvincialMapping
Author Email
Email of the author.
Accessed At
Date the data and metadata was accessed.
2026-08-13
Field Value
Identifier
Unique identifier for the dataset.
a386dc33d0ba44308c3d8c436aaa0d8b
Language
Language(s) of the dataset
English
Link to dataset description
A URL to an external document describing the dataset.
https://ontariogeohub-lio.opendata.arcgis.com/datasets/mnrf::extreme-flow-statistics
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
Does the data hold data about individuals?
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.
Ontario Ministry of Natural Resources and Forestry
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.
Number of data columns
If tabular dataset, total number of unique columns.
Number of data cells
If tabular dataset, total number of cells with data.
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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