Stormwater Roof Drainage Design

A typical commercial or multifamily residential building will utilize one of the following types of primary roof drainage.

Stormwater roof drainage design.

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. The new york city department of environ mental protection dep is responsible for the city s drainage plan and stormwater management. Often the floor plan of a building is designed then a roof is fitted over the plan. A roof drainage system usually comprises gutters eaves and downpipes.

Roof drainage design by greg burn 1 october 2009 build 114 the roof on a new building needs to be more than just aesthetically appealing and able to keep the building weathertight it must also effectively collect and dispose of rainwater. Native beds established on the green roof at dpr s five borough building on randall s island. Typical roofing stormwater work roof plumbing work involves a roof drainage system that collects and disposes of stormwater. This form of roof drainage is preferred if a clean exterior appearance is desired.

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 drainage design modern storm water design focuses on three important areas. These will drain to somewhere near the center of the roof and down through the building to underground storm mains or a detention pond.