4.2 Stormwater Management
Vertical gardens are not as effective as green roofs when it comes to stormwater management.
This is due to its design characteristics and location on the side walls of building.
Under heavy rain and strong wind, vertical garden is able to interrupt and delay run-off to some extent.
For grey water treatment, vertical garden can clean and filter the water through a system of planters filled with swam grasses and aquatic plants(Peck et al, 1999) Also, Hydroponic system in vertical garden can store rainwater and use it as a nutrient for plants to grow.
Consequently, less water goes to the sewage.
(Ottele, 2010)