Rehabilitating a city sewer system with centrifugally cast concrete pipe!
About 18 months ago, when he was just settling into his new job as Storm Water and Conservation Superintendent of Hays, Kan., Nicholas A. Willis decided to take a closer look at the storm water sewers underneath the picturesque brick streets in the city's center. He knew from records that the sewer was 48-in. arched corrugated metal pipe (CMP), and a little over 50 years old. Because that is nearing the maximum lifespan for CMP, Willis was not expecting to find pipe in perfect condition. Still, what he did find surprised him.