Operating within the green roof are the interception of rainfall by the plant layer infiltration and storage in the substrate and reservoir storage in the drainage layer.
Green roof roof drainage concepts.
A green roof is an additional roof system on top of an existing roof made up of a layer of planted vegetation.
Moisture will be lost to the atmosphere as a result of evapotranspiration during dry periods.
Integration with hard landscapes for example walkways terraces driveways or play areas etc.
This makes for lush plant growth on relatively thin substrate layers.
The most critical role of the drainage layer is to provide an adequate flow of water off the roof during and after rainfall.
On zero degree roofs a roof dam irrigation system can be installed which stores up to 40 mm of water.
There are two main forms of green roofs intensive and extensive.
Intensive roofs take more time to manage as they can hold up to 150 pounds of vegetation per square foot.
In addition to stormwater source control green roofs.
Green roof solutions offers many different drainage layer options depending on system goals regarding water retention.
The design of the different drainage layers allows for a portion of the stormwater to be retained above where the water is allowed to flow freely off of the roof.
The roof can provide natural substrate and processes for plant growth.
The green roof consists of 8 superimposed layers 1 to 8.
For green roofs small plants with fibrous roots and low water requirements are best suited.
The growing medium substrate the plant layer.
Having proper drainage on a green roof is a critical aspect of the system.
Design of drainage systems must be matched to the roof construction and catchment area.
The unique needs of a green roof installation.
Saturation of the soil.
A water proof layer material for water retention and proper drainage helps plant growth and at the same time protects the roof and building from damage.
As the soil takes on excessive amounts of water it continues to.
Primary drainage systems are not designed to remove all of the water that falls on a roof during exceptionally heavy rain.
The waterproofing membrane root barrier the drainage layer.
The green roof can be established on any load bearing components concrete tanbark wood.
A green roof may require a separately plumbed secondary drainage system also known as the overflow relief system.
These are collector drains that are designed to flow when only partly full.
Is not able to drain properly it can negatively impact the vegetation due to over.
System build up roof garden the roof garden green roof system is a multifunctional green roof build up with high water storage.
It is suitable for lawns perennials and with deeper growing media for shrubs and trees.
The roof garden build up allows for the realisation of a variety of design concepts even waterfeatures.
