Nyc Roof Water Detention

Water performance standard including subsur face rooftop and stormwater recycling systems.

Nyc roof water detention. Subsurface detention systems with infiltration capability provide temporary storage of stormwater runoff underground. Minimum and or per construction code away from building foundation. The department of buildings and the department of health. Parapet wall roof drainage scupper and overflow scupper location shall comply with the requirements of the new york city building code.

Rooftop detention also known as a blue roof is designed to provide temporary storage and slow release of stormwater runoff. Above the ground water table to prevent possible ground water infiltration into the sewer system and 10 ft. Philip kraus ceo and owner of manhattan based fred smith plumbing heating notes that monitoring of rooftop water tanks falls under the purview of two agencies. These systems store and slowly release storm water to the sewer system detention or dispose of stormwater onsite retention through infiltra tion to soils below evapotranspiration and re cycling onsite.

Rather than being absorbed naturally into the ground much of new york city s stormwater eventually flows into storm drains or catch basins and from there into the sewer system. As stormwater flows it sweeps up pollutants such as oils chemicals sediments pathogens and trash. This technique is most commonly used in dense urban areas where other methods of stormwater detention are impractical. Represents a better rooftop option where a roof cannot handle the additional weight of a green roof.

These systems have an open bottom and can incorporate perforated pipe and stormwater chambers for added detention volume. But a well engineered solution is essential. 1106 6 size of roof gutters the size of semicircular gutters shall be based on the maximum projected roof area in accordance with table 1106 6. Installing a rooftop detention system is a low cost option that can help you meet the city s stormwater detention requirement.

It is a relatively simple concept that results in a controlled flow system of rainwater from the roof. Rooftop systems are used to control runoff of stormwater and rooftop detention is the heart of blue roof technology. Porous open bottom detention facilities must be located a minimum of 3 ft. Hazen and sawyer recently designed a combination green and blue roof system for a building in new york city.

The regulation of the cleaning and inspection of water tanks is provided by two separate new york city agencies.