Henion Pond and the surrounding property are used as a youth summer camp, and the dam crest served as a walking path connecting camp facilities. Challenge The most critical deficiency of this Class II-Significant Hazard structure was the dam’s lack of spillway capacity. There were also significant internal erosion problems within the earth embankment near … Read more
Challenge A significant rainfall event caused overtopping and severely damaged the Club’s access road bridge abutments and Lower Pond Dam embankment. Solution GZA conducted hydrologic and hydraulic modeling of the watershed and site (Upper Pond Dam, Lower Pond Dam, and roadway culvert). Based on the results of its HEC-HMS modeling, GZA recommended that both dams … Read more
Our dam engineering group has provided dam engineering services to the City of Newark—from inspections to rehabilitation designs—for over 30 years (as Civil Dynamics and, since 2018, as GZA). Challenge Helping the City maintain its network of dams, some of which were constructed over 120 years ago, has required a full suite of dam engineering … Read more
Canty’s Lake and Silas Condict County Park are popular destinations for fishing, picnicking, and hiking. Canty’s Lake Dam, located in the park, is a Class II – Significant Hazard dam that required major rehabilitation. Challenge The dam’s most critical deficiency was the significantly undersized existing spillway. The small spillway and lack of freeboard was not … Read more
This Class I – High Hazard dam, constructed in the early 1900s, provided a source of water and electricity for a downstream paper mill (now closed). The New Jersey Department of Environmental Protection (NJDEP) owns the portion of the dam located within Holland Township; the portion in Pohatcong Township is privately owned. Regular Dam Inspections … Read more
PRINT READY VERSION> The Round Valley Reservoir, with a capacity of 55 billion gallons, is the largest drinking water supply in the State of New Jersey. Constructed in the 1960s, it is retained by three earthen structures classified as High Hazard – Large Dams. Challenge The Round Valley Reservoir Structures Refurbishment and Resource Preservation … Read more
