Ministry of Environment

Fisheries InventoryFisheries Inventory

Stream Survey Data Definitions

Watershed Code — A series of groups of digits separated by dashes that uniquely identifies watersheds (a stream and the surrounding land that drains into the stream) in British Columbia. Each group of digits represents an unique watershed and shows the hierarchy from the ocean to the identified watershed. A watershed has a single mainstem, so the watershed code uniquely identifies streams, as well as the watershed.

Gazetted Name — The legally registered name of the stream as obtained from Geographic Data B.C.

Survey Date - Day/Month/Year that the survey was conducted.

Mapsheet - TRIM 1:20,000 map of B.C.

UTM Zone, Easting, Northing — Universal Transverse Mercader NAD 83 co-ordinates for the mouth of the stream or the outlet of the lake as determined from the 1:50,000 Watershed Atlas digital map.

Site # - A digital identifier for the sample site.

Surveyed Length - The length, in metres, of the sample site on the stream.

Average channel width - The average channel width, in metres, taken from several measurements at a sample site.

# of Channel Width Measurements - The number of channel width measurements that were taken at a sampling site and used in the calculation of Average Channel Width.

Relative Water Level - An estimated description of flow in a channel at the time of survey.

Gradient - The slope, or rate of vertical drop per unit length of the channel bed expressed as a percentage.

Alias — One of the, possibly many, locally used names for a waterbody.

Species - Common name of fish species.

Obstruction Type - Identifies the stream obstruction e.g., falls.

Height - The estimated height of the stream obstruction in metres.

Distance from mouth - The distance in kilometres from the mouth of the stream to the point of obstruction.