Roof Rainwater Drainage Systems

The 1 100 rain water catchment system.

Roof rainwater drainage systems.

Commercial flat roofs need interior drains and scuppers to collect water instead. But don t let it scare you. Scuppers are the most effective drainage solution for flat roofs. Can keep water from pooling and building up near the building foundation.

While pitched roofs can rely on gravity to move water flat roofs can t just rely on a typical gravity driven gutter system. As the roof collects rain the water must be transported quickly and safely away by a drainage system. Protects doorways and window openings. Where the tube passes by the downspout from the gutter we installed a y fitting and drained the roof water from the gutter system directly into the main drainage line.

Rainwater harvest calculator length. To use this calculator input the dimensions of your roof only area connected to rainwater harvesting system and the amount of rainfall in inches. The 6 slotted triangle shape is used beneath the aggredrain layer and allows for water to flow freely. This is a large rainwater catchment system.

Commonly used on flat commercial roofs siphonic drains allow for a minimal number of drains and all of the drains can be connected to a single leader. Once all the parts of the drainage system were installed we covered the tubes with several inches of rock. See french drains for details of handling roof runoff at flat or poorly drained sites. Siphonic drains typically cost more than other drain systems but they work smoothly and require relatively little maintenance.

The green roof solutions drainage conduit is a stainless steel channel for use with the aggredrain system. That line eventually emptied into the low spot in the back yard. High maintenance gutters need continual cleaning and. Although they do have their benefits they also tend to be favored less due to several reasons.

Because the siphoning force helps move the water siphonic drain systems can employ horizontal leaders instead of sloped pipes which rely on gravity alone for drainage. Keeps water from pouring off of the roof in an uncontrollable manner. With this system large square openings are made along the edge of the roof that shoot the water away from the side of the building. A system of gutters and downspouts directs the rainwater collected by the roof to the storage cistern.

For flat sites it may be necessary to drain into a drywell or french drain system or into a pumping chamber that sends drainage to a remote storm drain or drywell.