Photo Courtesy of Malcolm Pirnie/CH2M Hill Joint Venture Each of the 56 UV units has a 40-million-gallon-a-day capacitysaid to be the largest built to date. Related Links: 2013 Best of the Best Projects Winners 2013 ENR New York's Best Water/Environment Project Winner New York City's $1.3-billion new water system stands as the world's largest-capacity ultraviolet disinfection plant. It is also the country's largest unfiltered surface-water facility, treating and controlling the flow of 2.2 billion gallons of drinking water every day.The project included several firsts, including the installation of equipment thought to be record-setters for size. For example, each of 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.