Hydrology: Hydrometric Watershed Boundaries

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Published by the Ministry of Environment and Climate Change Strategy - Knowledge Management
Licensed under Open Government Licence - British Columbia

Watershed boundary delineated for Canada-BC hydrometric stations. Currently, watersheds were delineated using 1:50,000 scale boundaries in 1996, and many watersheds encompass entire drainages, instead of just the upstream watersheds. Note - Not yet available, but we are in the process of generating BC hydrometric station upstream watersheds using updated base data, using the following method: Within BC, watershed boundaries are based on the 1:20,000-scale Freshwater Atlas fundamental watersheds, and trimmed using the BC TRIM DEM used to approximate the height-of-land at the station locations. Outside of BC, but within Canada, watershed boundaries were approximated using Canada CDED DEM data for delineation (no "stream burning" was used) and some manual editing of boundaries was done to approximately match hydrology data after the fact. Within U.S.A., the USGS Watershed Boundary Dataset was used (at the best scale available for each drainage) to delineate the watershed boundary, with the watershed trimmed using the USGS National Elevation Dataset to approximate the height-of-land when necessary.

Data and Resources

Dataset Extent

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

Additional Information

Purpose

Spatial layer intended to display hydrometric station watershed boundaries.

Contact Information

NameSam Albers (businessExpert)
EmailSam.Albers@gov.bc.ca
OrganizationMinistry of Environment and Climate Change Strategy
Sub-OrganizationKnowledge Management

Access & Security

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

Metadata Information

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

Object Description

Object Name: WHSE_WATER_MANAGEMENT.HYDZ_HYD_WATERSHED_BND_POLY

Short Name: HYD_WB_PLY
Comments: HYD WATERSHED BND POLY SP represents the watershed boundaries, at a level compatible with peak flow and annual runoff data.

Column Name Short Name Data Type Data Precision Comments
HYD_WATERSHED_BND_POLY_ID HDWTRSHDBN NUMBER 10 HYD WATERSHED BND POLY ID is the primary unique numeric identifier for a feature.
FEATURE_CODE FTRCD VARCHAR2 10 FEATURE CODE is a 10 character alpha-numeric code based on the Canadian Council on Surveying and Mapping (CCSM) coding convention.
SOURCE_NAME SRCNM VARCHAR2 40 SOURCE NAME is the source hydrometric station is located on.
PEAK_FLOW_10YR_IN_M3_PER_SEC PKFLW10RNM NUMBER 5 PEAK FLOW 10YR IN M3 PER SEC is the 10 year return period peak flow in cubic metres per second (m3/second).
ANNUAL_RUNOFF_IN_MM NNLRNFFNMM NUMBER 5 ANNUAL RUNOFF IN MM is the normal annual runoff in millimetres.
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 FEAT_AREA NUMBER 19 FEATURE_AREA_SQM is the system calculated area of a two-dimensional polygon in square meters
FEATURE_LENGTH_M FEAT_LEN NUMBER 19 FEATURE_LENGTH_M is the system calculated length or perimeter of a geometry in meters