construction industry and the municipal governments it serves. Army Corps of Engineers' Cold Regions Research & Engineering Laboratory (CRREL) is providing that data.ĬRREL researchers believe that the shallow burial technology has merit for the U.S. They want hard data, not empirical "true experience" stories. In general, however, engineers are not yet comfortable with the idea of insulated shallow burial. Even here at home, many cold region water departments have reached their own conclusions about the practicality of shallow burial with shielded pipe, and are presently subscribing to the practice. In Norway and other cold regions of Europe, approaches to utility pipe burial are far less conservative than in the U.S. Shallow burial of lines with shielded pipe may be one answer The disturbance of deep digging may be prohibited. The main problem occurs where bedrock is close to the surface, or where the water pipe must cross some other utility line, and underlying rock makes it difficult to dig deeper, or necessitates blasting.Īnother problem is created by water lines that must run through environmentally sensitive areas, such as marshes. But sometimes it's not an adequate solution. With modern construction equipment, this may be simple enough. The classic rule-of-thumb procedure for avoiding cold-weather damage to water pipe is "bury it deep." If water lines are located below the lowest level of frost penetration-five to six feet or more in many cold region locales-they should be safe from freezing. Cold Regions Research & Engineering Laboratory, Hanover, NH
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