Table 2.2
Average annual water yield and selected statistics by drainage region, 1971 to 2013

Table 2.2
Average annual water yield and selected statistics by drainage region, 1971 to 2013
Table summary
This table displays the results of Average annual water yield and selected statistics by drainage region code, Total area, Population, 2011, Average annual water yield, 1971 to 2013, Water yield per area, 1971 to 2013, Water yield per capita, 1971 to 2013, Water yield variability index, 1971 to 2013 and Average annual evapotranspiration, 1981 to 2010, calculated using km2, persons, km3, m3/m2, m3/person and monthly CV units of measure (appearing as column headers).
code Total areaTable 2.2 Note 1 Population, 2011 Average annual water yield, 1971 to 2013Table 2.2 Note 2 Water yield per area, 1971 to 2013Table 2.2 Note 2 Water yield per capita, 1971 to 2013 Water yield variability index, 1971 to 2013Table 2.2 Note 3 Average annual evapotranspiration, 1981 to 2010Table 2.2 Note 4
km2 persons km3 m3/m2 m3/person monthly CV m3/m2
Canada Note ...: not applicable 9,978,923 33,476,688 3,478.2 0.35 103,899 1.05 0.23
Pacific Coastal 1 334,455 1,505,007 510.2 1.53 339,002 0.50 0.26
Fraser–Lower Mainland 2 233,104 2,336,941 129.3 0.55 55,337 0.83 0.33
Okanagan–Similkameen 3 15,603 327,548 4.3 0.27 13,070 1.44 0.41
Columbia 4 87,323 160,896 67.9 0.78 422,042 1.04 0.41
Yukon 5 332,906 32,280 106.0 0.32 3,283,759 Note ..: not available for a specific reference period 0.14
Peace–Athabasca 6 485,145 406,303 99.5 0.21 244,789 1.01 0.31
Lower Mackenzie 7 1,330,490 52,844 246.3 0.19 4,660,913 Note ..: not available for a specific reference period 0.17
Arctic Coast–Islands 8 1,764,280 20,133 231.3 0.13 11,488,870 Note ..: not available for a specific reference period 0.11
Missouri 9 27,096 8,439 0.5 0.02 62,660 2.14 0.33
North Saskatchewan 10 150,151 1,559,613 10.4 0.07 6,700 1.04 0.34
South Saskatchewan 11 177,623 2,168,447 10.3 0.06 4,732 1.10 0.34
Assiniboine–Red 12 190,704 1,464,936 8.4 0.04 5,702 2.49 0.39
Winnipeg 13 107,655 82,775 25.9 0.24 312,611 0.87 0.40
Lower Saskatchewan–Nelson 14 360,887 216,586 51.7 0.14 238,501 0.92 0.32
Churchill 15 313,568 94,292 51.0 0.16 541,004 0.75 0.24
Keewatin–Southern Baffin Island 16 939,569 13,968 192.0 0.20 13,745,664 Note ..: not available for a specific reference period 0.13
Northern Ontario 17 691,809 134,355 199.2 0.29 1,482,638 Note ..: not available for a specific reference period 0.31
Northern Quebec 18 940,193 109,239 516.3 0.55 4,726,324 Note ..: not available for a specific reference period 0.18
Great Lakes 19 317,860 11,287,184 133.3 0.42 11,806 0.72 0.48
Ottawa 20 146,353 1,957,937 64.3 0.44 32,858 0.80 0.47
St. Lawrence 21 118,733 6,583,552 72.3 0.61 10,983 0.76 0.39
North Shore–Gaspé 22 369,095 508,869 290.4 0.79 570,600 0.91 0.27
Saint John–St. Croix 23 41,903 413,581 29.8 0.71 72,156 0.89 0.48
Maritime Coastal 24 122,057 1,515,262 103.6 0.85 68,343 1.03 0.47
Newfoundland–Labrador 25 380,361 515,698 324.2 0.85 628,662 Note ..: not available for a specific reference period 0.23
Newfoundland (Island)Table 2.2 Note 5 Note ...: not applicable 111,186 487,808 125.6 1.13 257,404 0.62 0.34
.. not available for a specific reference period
... not applicable
Note 1.

Total area includes land and water.

Return to note 1 referrer

Note 2.

The water yield estimates are 42-year annual averages (1971 to 2013), with the exception of estimates for drainage region 1, which is based on 41 years of data (1971 to 2012); drainage regions 5, 7, 17 and 18 and portions of 8, 16 and 25 (Labrador), which are based on 20 years of data (1976 to 1995); and portions of drainage region 8 and 16, which are based on a 23-year average (1972 to 1994) for the Arctic Archipelago (Spence and Burke, 2008).

Return to note 2 referrer

Note 3.

Variability is measured by using a coefficient of variation (CV) that allows the comparison of all months in all years of the 42-year time period. The CV of the water yield data is a measure of the dispersion or variation in the monthly yield values over the period 1971 to 2013. It is defined as the ratio of the standard deviation of the monthly values to the mean. A higher CV indicates that the monthly data are more variable from year to year. The CV for the Pacific Coastal drainage region is for the period 1971 to 2012. The CV was not calculated for drainage regions 5, 7, 8, 16, 17, 18 and the Labrador portion of 25.

Return to note 3 referrer

Note 4.

Evapotranspiration is taken from a dataset providing estimates of actual evapotranspiration at a 1 km resolution, which is modeled by integrating remote sensing land surface data and gridded climate data. Data exclude the Great Lakes.

Return to note 4 referrer

Note 5.

Data for Newfoundland (Island) are disaggregated from the Newfoundland–Labrador drainage region because data on the variability index, monthly water yield and trends in water yield over time are only available for this portion of the region.

Return to note 5 referrer

Note: The water yield and evapotranspiration statistics are provided to allow comparisons across regions. They are not intended to be used for the purposes of a water budget.
Sources: Statistics Canada, Environment, Energy and Transportation Statistics Division, 2017, special tabulation from the 2011 Census of Population; Environment and Climate Change Canada, 2015, Water Survey of Canada, Archived Hydrometric Data (HYDAT), (accessed December 3rd, 2015); Spence, C. and A. Burke, 2008, “Estimates of Canadian Arctic archipelago runoff from observed hydrometric data,” Journal of Hydrology, Vol. 362, pp. 247–259; Wang, S., Y. Yang, Y. Luo and A. Rivera, 2013, “Spatial and seasonal variations in evapotranspiration over Canada's landmass,” Hydrology and Earth System Sciences, Vol. 17, no. 9, pp. 3561–3575, doi: 10.5194/hess-17-3561-2013.
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