Stormwater Roof Drainage Design

Separate storm and sanitary drainage systems water may accumulate on the roof because of building design and a building storm drainage system is installed which will consist of a primary and a secondary system.

Stormwater roof drainage design.

Stormwater is then carried away to either a collection point or to the graded area around the building and flows naturally away from the building. Often the floor plan of a building is designed then a roof is fitted over the plan. Many factors affect how quickly water drains off a roof if water drains completely and if the roof is watertight. The new york city department of environ mental protection dep is responsible for the city s drainage plan and stormwater management.

Native beds established on the green roof at dpr s five borough building on randall s island. These will drain to somewhere near the center of the roof and down through the building to underground storm mains or a detention pond. This form of roof drainage is preferred if a clean exterior appearance is desired. Slowing down water flow to reduce flooding or erosion problems downstream retaining water on the property for use in gardens as a natural filtration system.

A roof drainage system usually comprises gutters eaves and downpipes. Through dep approval of sew er certifications approval that the city sew er can accept the proposed discharge and. Stormwater drainage design modern storm water design focuses on three important areas.