Breaking point: Temperature swings tough on water pipes

Mile High Water Talk

With the ups and downs of winter weather in Colorado, repair crews are clamping down on main breaks across Denver.

By Jay Adams

Denver winters can feel like a rollercoaster ride — cold and snowy one day, mild and sunny the next. All those ups and downs make for interesting weather forecasts, but those temperature swings also take a toll on water mains under city streets.

Through Dec. 20, Denver Water crews had fixed more than 318 water main breaks this year. Of those, nearly 20 percent were linked to dramatic changes in temperature.

Temperature breaks, technically called “shear breaks,” are caused when the ground shifts due to changes in the weather.

Shear breaks occur during prolonged cold spells and fast warm-ups.

When temperatures drop, the ground freezes, causing water molecules inside the soil to expand. The longer the temperature stays below freezing, the deeper the frost layer stretches below…

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