Represents a better rooftop option where a roof cannot handle the additional weight of a green roof.
Nyc roof water detention.
This technique is most commonly used in dense urban areas where other methods of stormwater detention are impractical.
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.
But a well engineered solution is essential.
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.
Subsurface detention systems with infiltration capability provide temporary storage of stormwater runoff underground.
Minimum and or per construction code away from building foundation.
Provides equivalent stormwater detention to a green roof at a fraction of the cost.
Hazen and sawyer recently designed a combination green and blue roof system for a building in new york city.
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.
Systems are primarily designed with a gravel bed that stores water until it can infiltrate into the ground.
Porous open bottom detention facilities must be located a minimum of 3 ft.
These systems have an open bottom and can incorporate perforated pipe and stormwater chambers for added detention volume.
Rooftop detention also known as a blue roof is designed to provide temporary storage and slow release of stormwater runoff.
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.
Water performance standard including subsur face rooftop and stormwater recycling systems.
Rooftop systems are used to control runoff of stormwater and rooftop detention is the heart of blue roof technology.
As stormwater flows it sweeps up pollutants such as oils chemicals sediments pathogens and trash.
It is a relatively simple concept that results in a controlled flow system of rainwater from the roof.
Installing a rooftop detention system is a low cost option that can help you meet the city s stormwater detention requirement.
