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Table 2.2
Average annual water yield by drainage region, 1971 to 2004

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Average annual water yield by drainage region, 1971 to 2004
  Drainage region code Water yield
Volume 1 Volume per unit area
  number km 3 3 per m 2
Canada   3,472.3 0.348
Pacific Coastal 1 513.7 1.536
Fraser–Lower Mainland 2 128.6 0.552
Okanagan–Similkameen 3 4.2 0.270
Columbia 4 67.7 0.776
Yukon 5 106.0 0.318
Peace–Athabasca 6 99.9 0.206
Lower Mackenzie 7 246.3 0.185
Arctic Coast–Islands 8 231.3 0.131
Missouri 9 0.5 0.019
North Saskatchewan 10 10.2 0.068
South Saskatchewan 11 9.6 0.054
Assiniboine–Red 12 6.9 0.036
Winnipeg 13 25.4 0.236
Lower Saskatchewan–Nelson 14 47.6 0.132
Churchill 15 49.4 0.158
Keewatin–Southern Baffin Island 16 192.0 0.204
Northern Ontario 17 199.2 0.288
Northern Quebec 18 516.3 0.549
Great Lakes 19 133.1 0.419
Ottawa 20 62.6 0.428
St. Lawrence 21 71.3 0.600
North Shore–Gaspé 22 292.2 0.792
Saint John–St. Croix 23 29.2 0.697
Maritime Coastal 24 103.6 0.849
Newfoundland–Labrador 25 325.4 0.856
The water yield estimates are 34-year annual averages (1971 to 2004), with the exception of those estimates for drainage regions 5, 7, 16, 17, 18 and the Labrador portion of 25 which are based on 20 years of data (1975 to 1996); and drainage region 8 which is based on a 23-year annual average (1972-1994) for the Arctic Archipelago (Spence and Buke 2008), and on a 20-year annual average (1975 to 1996) for the remaining area.
Note(s):
Data were derived from discharge values contained in Environment Canada, 2010, Water Survey of Canada, Archived Hydrometric Data (HYDAT) (www.wsc.ec.gc.ca/hydat/H2O/index_e.cfm?cname=main_e.cfm).
Source(s):
Spence C., and A. Burke, 2008, "Estimates of Canadian Arctic Archipelago Runoff from Observed Hydrometric Data," Journal of Hydrology , Vol. 362, pages 247 to 259. Statistics Canada, Environment Accounts and Statistics Division, 2010, special tabulation.