As tempting as the water looks. Flat, calm water is still very Unpredictable. Please don't be tempted to swim in a reservoir today! The temperature of the water varies very little during summer/winter & is always below 12°C. #ColdWaterShock kills in little less than 60sec YWHelp https://t.co/nhSWfYFX4FAs tempting as the water looks. Flat, 1879807 As tempting as the water looks. Flat, calm water is still very Unpredictable. Please don't be tempted to swim in a reservoir today! The temperature of the water varies very little during summer/winter & is always below 12°C. #ColdWaterShock kills