Description

This layer represents the watershed areas that report to Water Survey of Canada (WSC) and United States Geological Survey (USGS) gauge stations that meet the following criteria for inclusion: at least 10 years or data (with 350 or more days of observations) above the low outlier threshold; less than 20% (by basin drainage area) regulation; a corresponding basin polygon dataset (either supplied or delineated) with a area <15% different than the basin area reported by WSC or USGS; full metadata coverage for the basin (e.g. mean annual precipitation, elevation, etc.); and 1-, 3-, 5-, and -10 day distribution fits that did not overlap for any Average Recurrence Interval’s (ARI) above 2 years. See Bulletin 2020-1-RFFA British Columbia Extreme Flood Project – Regional Flood Frequency Analysis – Technical development report and manual to complete a regional flood frequency analysis.

Resources

Name	Format	Description	Link
Bulletin 2020-1-Regional Flood Frequency Analysis Watershed	ZIP		https://catalogue.data.gov.bc.ca/dataset/f1f86c41-ae83-49d5-92e1-526897b99fa2/resource/dca69e08-39e1-42bc-8a7a-304ebce28b5f/download/bulletin_2020_1_regional_flood_frequency_analysis_watershed.zip
Original metadata (https://catalogue.data.gov.bc.ca)	HTML		https://catalogue.data.gov.bc.ca/dataset/regional-flood-frequency-analysis-watershed
British Columbia Regional Flood Frequency Analysis Portal	HTML		https://governmentofbc.maps.arcgis.com/apps/MapSeries/index.html?appid=264822e7f5824120bf61f129e358fda0

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