EnvironmentalIt took three days, but workers at New York City's North River Wastewater Treatment Plant finally succeeded in stopping raw sewage from flowing into the Hudson River after a fire shuttered the plant on July 20. On average, the plant, located in Harlem west of the West Side Highway, treats 20 million gallons per day of wastewater. The plant has been in operation since 1986.The four-alarm blaze began in the engine room at about 11:45 a.m., shutting down pumps and causing millions of gallons of sewage to spill into the river. Dept. of Environmental Protection workers and contractors stopped the
Arch dams, classically curved monoliths situated in narrow valleys, are not as common as other types of dams, such as embankment dams and gravity dams. ENR takes a look at some of the biggest arch dams in the world, both completed and under construction.