Environmental Engineering Reference
In-Depth Information
Table 4 Decentralised storm water management techniques
Categories
Techniques/measures
Source control
Green roofs, rainwater harvesting, permeable paving and other
permeable surfaces
Swales
and conveyance
Swales, channels and rills
channels
Filtration
Filter strips, filter trenches, bioretention areas
In
ltration
Soakaways,
in
ltration trenches,
in
ltration basins and rain
gardens
Retention and detention
Detention basins and retention ponds
Wetlands
Wetlands
Source
www.susdrain.org
What Are Rain Gardens?
Rain gardens are shallow-planted depressions designed to receive rainwater
from hard surfaces such as roofs, paved areas or roads. The excess run-off
in
flow on site and recharges groundwater.
The soil layers underneath also assist in the removal of pollution, such as
nitrogen, phosphorus and fertilisers, which are washed off from hard sur-
faces. The plants in the rain garden help to further
ltrates into the soil, reducing peak
filter out pollution. Rain
gardens can be applied at a variety of scales and are self-suf
cient compared
to regular gardens as they use storm water directly, thus resulting in reduced
domestic water use for gardening.
Raingarden design principles.
Source Clear Water (
2012a
);
http://www.
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