Nyc Roof Water Detention

After a storm has abated the accumulated water drains off within a prescribed period of time.

Nyc roof water detention.

Prior to the invention of the elevator buildings were not built over seven stories. Instead of running off the roof via gutters and downpipes the water is temporarily stored or allowed to pond on the surface and then released slowly so that it can drain away gradually. Water and sewer forms visit water sewer forms for sewer connection forms and reference materials. Provides equivalent stormwater detention to a green roof at a fraction of the cost.

It is a relatively simple concept that results in a controlled flow system of rainwater from the roof. Minimum and or per construction code away from building foundation. 1101 7 roof design roofs shall be designed for the maximum possible depth of water that will pond thereon as determined by the relative levels of roof deck and overflow weirs scuppers edges or serviceable drains in combination with the deflected structural elements. Above the ground water table to prevent possible ground water infiltration into the sewer system and 10 ft.

Installing a rooftop detention system is a low cost option that can help you meet the city s stormwater detention requirement. Hazen and sawyer recently designed a combination green and blue roof system for a building in new york city. Rooftop detention is the heart of blue roof technology. View the rules governing house and site connections to the city s sewer system.

Water performance standard including subsur face rooftop and stormwater recycling systems. The original purpose of roof tanks was to supply drinking and bathing water to people living above the sixth floor says david hochhauser who along with his brother and sister owns isseks brothers a tank servicing company based in lower manhattan. Represents a better rooftop option where a roof cannot handle the additional weight of a green roof. This technique is most commonly used in dense urban areas where other methods of stormwater detention are impractical.

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. This system permits rainwater to drain off a roof at a controlled rate usually equal to or less than the previous undeveloped rate. Another method of detaining stormwater on site is controlled flow roof drainage.