Croton Water Filtration Plant Awarded MENY 2016 Project of the Year

The state-of-the-art Croton facility, constructed under a driving range, can provide roughly 30 percent of the City’s current daily water needs, providing critical system flexibility and redundancy.

The design team implemented several innovative techniques in order to reduce the footprint (23%) and building volume (32%) in order to meet the Consent Order driven site limits without negatively impacting the treatment process.

A separate site preparation contract was implemented to remove ~900,000 cy of rock and soil, while the design of the plant was being finalized. This allowed construction of the facility, requiring 13 separate construction contracts at 6 different sites, to meet critical Consent Order mandated milestones.

Many sustainable design aspects were incorporated into the site including the largest green roof in the US, capturing stormwater for on-site irrigation, and protection of forested wetlands in the urban environment. In total, the green roof and surrounding wetlands utilize natural processes to control and filter 40% of the stormwater reducing the amount of stormwater runoff and pollutants from entering the City’s combined storm sewer system.

The surrounding community was shielded from the construction by this pleasant, park-like vantage point along Jerome Avenue. Pedestrians had little idea that a major construction site, including 18 months of blasting and hauling debris, lay on the other side of the waterfall feature.

The Croton system supplies up to 30% of NYC’s drinking water. The construction of the Croton WFP allows the City to restore use of this existing water supply to deliver safe and clean drinking water to nearly 9-million consumers, and improves the overall reliability of the City’s water supply system while they make critical repairs to other areas with aging infrastructure.

(NEW YORK, NY – October 7, 2016) – The Municipal Engineers of the City of New York (MENY) has selected the Croton Water Filtration Plant as the 2016 Project of the Year.

A formal presentation of the award was made at MENY’s Annual Dinner Dance held on November 18, 2016 in Queens.

The Croton water supply plays a fundamental part in New York City’s water supply system, providing up to 30% of NYC’s drinking water. In order to comply with more stringent water quality regulations, the City entered into a Consent Decree with USEPA and NYSDOH. The City obtained State approval in 2004 for construction of the facility. The AECOM/Hazen and Sawyer joint venture prepared conceptual designs, performed environmental impacts studies, prepared preliminary and final designs, and provided design services during construction and start-up operational services for this landmark plant, located under the Mosholu Golf Course, within Van Cortlandt Park.

Built entirely underground and requiring deep rock excavation and tunneling for the necessary conveyance tunnels, the four-story, 290-mgd plant will provide a safe and reliable water source for generations to come. A high level of innovation was demonstrated by this project, including: use of stacked dissolved air filtration/flotation (DAF) tanks (the largest in the world), followed by ultraviolet light (UV) disinfection (one of the largest in the world); state-of-the-art digital automation architecture and systems; and utilization of extensive Computational Fluid Dynamics (CFD) and physical modeling throughout the design. The plant is designed as two 50 percent capacity process trains, capable of independent operation, to provide added operational flexibility and redundancy. The plant ensures a safe and reliable Croton water source for the future, as the City shuts down other water supply sources for maintenance and to make necessary repairs.

The design of the massive facility features an impressive array of sustainability measures that minimize the facility’s impact on the environment and improve the quality of life in the surrounding community. The nine-acre golf course that covers the plant is said to be the country’s largest green roof. In total, the green roof and surrounding wetlands utilize natural processes to control and filter 40 percent of the site’s stormwater.

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