Municipal and plant officials continue to look for the cause of the May 16 collapse of a 100-ft wall at the wastewater treatment plant serving Binghamton and Johnson City, N.Y. The event triggered a 580,000-gal spill of partially treated wastewater into a local creek and the nearby Susquehanna River. Four of the plants 20 filtration cells were destroyed when the 15-ft tall, 18-in thick wall fell.A post-construction quality audit of the plant, issued in February by LMK Engineers LLC of Pottstown, Pa., found more than 150 deficiencies that it blamed on inadequate construction management.Design and configuration control during construction and
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.