Nyc Roof Water Detention

Rooftop systems are used to control runoff of stormwater and rooftop detention is the heart of blue roof technology.

Nyc roof water detention.

Parapet wall roof drainage scupper and overflow scupper location shall comply with the requirements of the new york city building code. Provides equivalent stormwater detention to a green roof at a fraction of the cost. The department of buildings and the department of health. Systems are primarily designed with a gravel bed that stores water until it can infiltrate into the ground.

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. Rooftop detention systems or blue roofs temporarily store and gradually drain rainwater off a building s rooftop in order to slow the flow of stormwater into the city s sewer system when it rains. It is a relatively simple concept that results in a controlled flow system of rainwater from the roof. This technique is most commonly used in dense urban areas where other methods of stormwater detention are impractical.

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. Minimum and or per construction code away from building foundation. As stormwater flows it sweeps up pollutants such as oils chemicals sediments pathogens and trash. 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.

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. Above the ground water table to prevent possible ground water infiltration into the sewer system and 10 ft. Rooftop detention also known as a blue roof is designed to provide temporary storage and slow release of stormwater runoff. These systems have an open bottom and can incorporate perforated pipe and stormwater chambers for added detention volume.

Porous open bottom detention facilities must be located a minimum of 3 ft. Installing a rooftop detention system is a low cost option that can help you meet the city s stormwater detention requirement. But a well engineered solution is essential. Water performance standard including subsur face rooftop and stormwater recycling systems.

Subsurface detention systems with infiltration capability provide temporary storage of stormwater runoff underground.