Roof Rainwater Drainage Systems

Can keep water from pooling and building up near the building foundation.

Roof rainwater drainage systems.

The green roof solutions drainage conduit is a stainless steel channel for use with the aggredrain system. While pitched roofs can rely on gravity to move water flat roofs can t just rely on a typical gravity driven gutter system. Inexpensive gutters are the easiest types of drain systems to get and install. A system of gutters and downspouts directs the rainwater collected by the roof to the storage cistern.

Commercial flat roofs need interior drains and scuppers to collect water instead. 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. This is a large rainwater catchment system. The cistern typically located underground may be constructed of various materials including cinderblock reinforced concrete or precast concrete fiberglass or steel.

Once all the parts of the drainage system were installed we covered the tubes with several inches of rock. 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. That line eventually emptied into the low spot in the back yard. Keeps water from pouring off of the roof in an uncontrollable manner.

See french drains for details of handling roof runoff at flat or poorly drained sites. The 6 slotted triangle shape is used beneath the aggredrain layer and allows for water to flow freely. 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. 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. High maintenance gutters need continual cleaning and. Rainwater harvest calculator length. As the roof collects rain the water must be transported quickly and safely away by a drainage system.

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. Siphonic drains typically cost more than other drain systems but they work smoothly and require relatively little maintenance. Scuppers are the most effective drainage solution for flat roofs. The 1 100 rain water catchment system.

To use this calculator input the dimensions of your roof only area connected to rainwater harvesting system and the amount of rainfall in inches.