Chart 1
Stations with natural flow: maximum, average and minimum number of stations included for each year after filtering the database, 1971 to 2000

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Stations with natural flow: maximum, average and minimum number of stations included for each year after filtering the database, 1971 to 2000
Source(s):  Environment Canada, 2007, National Water Data Archive, Hydrometric database (HYDAT), www.wsc.ec.gc.ca/products/hydat/main_e.cfm?cname=hydat_iso_e.cfm (accessed January 7, 2009) and Statistics Canada, Environment Accounts and Statistics Division.