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The Water Security Agency (WSA) expects water levels at Lake Diefenbaker to rise over one metre in the next 10 days as a result of the weather system in Alberta and Saskatchewan this weekend.
Significant rainfall in Southern Alberta and parts of Saskatchewan is forecast, with Environment and Climate Change Canada issuing a warning for between 40 and 70 mm, with up to 100 mm in some areas along the eastern Rockies in Alberta and 40 to 80 mm of heavy rain in Saskatchewan by Saturday night.
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In a news release on June 20, WSA said said the rainfall would lead to increased flow on the South Saskatchewan River between the border with Alberta and Lake Diefenbaker.
The agency said Lake Diefenbaker has sufficient storage to capture the added inflow, but it will increase outflows on the South Saskatchewan to better manage the expected increases at the reservoir.
The rain is also expected to increase flows in the South Saskatchewan River and its tributaries, WSA said, and Alberta has began increasing reservoir releases to make room for storage in its reservoirs in the area where the rain is expected.
The forecast rain will also probably increase runoff into the South Saskatchewan River and other bodies of water between the western border and Lake Diefenbaker.
WSA said it was expecting to see flows along the South Saskatchewan River increase from 100 cubic meters per second to around 830 cubic meters per second.
Flows along tributaries are also expected to increase, with peak flows expected to occur around June 26.
Outflows on the South Saskatchewan River between Lake Diefenbaker and Saskatoon are expected to increase from their current rate of 65 cubic meters per second to 75 cubic meters per second.
The forecast may vary from this prediction because of rainfall intensity, duration, and location, WSA said.
It said people should take sensible precautions around lakes and rivers and be aware that flows and levels can change rapidly and without warning.
People should also check local conditions before venturing on or near water bodies.
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