Mackenzie River
At , the Mackenzie River drainage basin encompasses nearly 20 percent of Canada. About , or 54 percent of the basin, lies above Great Slave Lake. Permafrost underlies about three-quarters of the watershed, reaching up to deep in the Mackenzie Delta. As a whole, the Mackenzie basin receives only meager to moderate rainfall, averaging over the entire basin, though mountain areas experience much higher precipitation, and areas near and north of the Arctic Circle receive much lower precipitation.
Okanagan Basin Water Board
Water is one of the most precious and important natural assets in the Okanagan Basin. Even though the Basin is endowed with several large lakes, the supply of clean, reliable water is inherently limited by the semi-arid to arid climate, which brings minimal precipitation and high evaporation and evapotranspiration rates. In fact, according to Statistics Canada the Okanagan Basin has the lowest, per capita availability of fresh water in Canada. Water shortages have already occurred in some areas of the Basin, and are expected to occur more widely and frequently in the future.