Nyc Roof Water Detention

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.

Nyc roof water detention.

Rooftop systems are used to control runoff of stormwater and rooftop detention is the heart of blue roof technology. 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. Represents a better rooftop option where a roof cannot handle the additional weight of a green roof.

Systems are primarily designed with a gravel bed that stores water until it can infiltrate into the ground. As stormwater flows it sweeps up pollutants such as oils chemicals sediments pathogens and trash. Subsurface detention systems with infiltration capability provide temporary storage of stormwater runoff underground. 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.

The regulation of the cleaning and inspection of water tanks is provided by two separate new york city agencies. These systems have an open bottom and can incorporate perforated pipe and stormwater chambers for added detention volume. This technique is most commonly used in dense urban areas where other methods of stormwater detention are impractical. But a well engineered solution is essential.

Parapet wall roof drainage scupper and overflow scupper location shall comply with the requirements of the new york city building code. Minimum and or per construction code away from building foundation. Provides equivalent stormwater detention to a green roof at a fraction of the cost. The department of buildings and the department of health.

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. 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 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.