Lake Diefenbaker Overwinter Operating Plan

The focus of the overwinter operating plan is to retain water while minimizing impacts downstream. Historically, winter outflows averaged 240 cubic metres per second (m3/s). WSA plans to restrict overwinter outflows. Flows will fluctuate in a limited range of 60 to 110 m3/s. This will minimize the overall winter drop in water levels to one metre (m). The historical average drop in winter water levels is 4.5 m.