But a well engineered solution is essential.
Nyc roof water detention.
This technique is most commonly used in dense urban areas where other methods of stormwater detention are impractical.
Parapet wall roof drainage scupper and overflow scupper location shall comply with the requirements of the new york city building code.
The regulation of the cleaning and inspection of water tanks is provided by two separate new york city agencies.
Installing a rooftop detention system is a low cost option that can help you meet the city s stormwater detention requirement.
Porous open bottom detention facilities must be located a minimum of 3 ft.
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.
Subsurface detention systems with infiltration capability provide temporary storage of stormwater runoff underground.
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.
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.
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.
Above the ground water table to prevent possible ground water infiltration into the sewer system and 10 ft.
It is a relatively simple concept that results in a controlled flow system of rainwater from the roof.
The department of buildings and the department of health.
Provides equivalent stormwater detention to a green roof at a fraction of the cost.
Systems are primarily designed with a gravel bed that stores water until it can infiltrate into the ground.
Hazen and sawyer recently designed a combination green and blue roof system for a building in new york city.
Represents a better rooftop option where a roof cannot handle the additional weight of a green roof.
Minimum and or per construction code away from building foundation.
Rooftop systems are used to control runoff of stormwater and rooftop detention is the heart of blue roof technology.
These systems have an open bottom and can incorporate perforated pipe and stormwater chambers for added detention volume.
Water performance standard including subsur face rooftop and stormwater recycling systems.
