Project : White Plains No. 2 Dam Rehabilitation

City of White Plains -- White Plains, New York

White Plains Reservoir No. 2 Dam is a 15-foot tall, 620-foot long, earthen embankment. This Class “C” High Hazard dam impounds raw water for the City of White Plains. CHA performed a hydrologic and hydraulic evaluation and concluded that the spillway configuration was insufficient to pass flows associated with the spillway design flood, 50% of the Probable Maximum Flood, a requirement of the New York State Department of Environmental Conservation Dam Safety Guidelines.

To meet the dam safety requirements, CHA designed a 125-foot long ogee crest spillway that discharges through a new 20-foot wide by 8-foot high concrete culvert below a city road. We developed plans, specifications and a permit application package for the NYSDEC and the USACE to rehabilitate the dam. The City of White Plains also retained CHA to provide contract administration, technical engineering support, and construction observation services throughout construction.

Services Provided by CHA:
  • Dam Safety Inspection
  • Survey
  • Geotechnical Investigation
  • Stability Analysis
  • Hydrologic and Hydraulic Evaluation
  • Wetland Delineation
  • Threatened and Endangered Species Survey
  • Permit Application Preparation
  • Hydraulic Design
  • Spillway Design
  • Erosion and Sediment Control Design
  • Dam Safety Design
  • Structural Stability and Concrete Structure Design
  • Construction Observation
  • Construction Administration Services
  • Drainage Design
  • Roadway Replacement Design