In 1967, when the Gardiner Dam backed up the South Saskatchewan River to create the 200-km-long Lake Diefenbaker in the middle of Saskatchewan, the plan was to irrigate 500,000 parched acres. To this day, the giant T-shaped lake — named after Saskatchewan politician and Canada’s 13th Prime Minister, John George Diefenbaker — irrigates only 100,000 to 150,000 acres. “The Dief” is, one might say, an untapped resource, a ’60s-era feat of engineering stuck in vaporization mode. (It is said the lake loses more water to evaporation each year than it gives up for crop watering.)