Table 3.2.2
Selected statistics on water supply and demand, Fraser–Lower Mainland drainage region

Table 3.2.2
Selected statistics on water supply and demand, Fraser–Lower Mainland drainage region
Table summary
This table displays the results of Selected statistics on water supply and demand Population, 1971, Population, 2011, Density, 1971, Density, 2011, Surface freshwater intake, 2013, Average annual water yield, 1971 to 2013, Water yield per area, 1971 to 2013, Water yield variability index, 1971 to 2013 and Average annual evapotranspiration, 1981 to 2010, calculated using persons, persons/km2, million m3, km3, m3/m2 and monthly CV units of measure (appearing as column headers).
Population, 1971 Population, 2011 Density, 1971 Density, 2011 Surface freshwater intake, 2013Table 3.2.2 Note 1 Average annual water yield, 1971 to 2013Table 3.2.2 Note 2 Water yield per area, 1971 to 2013Table 3.2.2 Note 2 Water yield variability index,Table 3.2.2 Note 3 1971 to 2013Table 3.2.2 Note 2 Average annual evapotranspiration, 1981 to 2010Table 3.2.2 Note 4
persons persons/km2 million m3 km3 m3/m2 monthly CV m3/m2
Canada 21,568,311 33,476,688 2.4 3.8 33,464.7 3,478.2 0.35 1.05 0.23
Fraser–Lower Mainland 971,762 2,336,941 4.3 10.4 615.3 129.3 0.55 0.83 0.33
Note 1.

Surface freshwater intake aggregates data from the Survey of Drinking Water Plants, 2013 and the Industrial Water Use Survey, 2013, with estimates of agricultural water use for 2013 based on the Agricultural Water Use Survey and the Alberta Irrigation Information report. Withdrawals from groundwater, groundwater under the influence of surface water and marine water sources are excluded. Data for water use by the oil and gas industry and households not supplied by a public water provider are also excluded.

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). For equivalences: 1 km3 is equal to 1 billion m3.

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: 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 1971 and 2011 Censuses of Population; Industrial Water Use Survey, 2013; Survey of Drinking Water Plants, 2013; Agricultural Water Use Survey, 2010, 2012 and 2014; Alberta Agriculture and Rural Development, 2014, Alberta Irrigation Information: Facts and Figures for the Year 2013, Basin Water Management Branch; Environment and Climate Change Canada, 2015, Water Survey of Canada, Archived Hydrometric Data (HYDAT), (accessed December 3, 2016); Spence, C. and A. Burke, 2008, “Estimates of Canadian Arctic Archipelago runoff from observed hydrometric data,” Journal of Hydrology, Vol. 362, pp. 247 to 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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