Environmental Engineering Reference
In-Depth Information
Arti
cial urban wetlands
Deep ground in
ltration
Bio-swales and swales
4.1 Reduced Pluvial Flood Risk
While conventional storm water management relies on a system of dykes (
ood
defence structures) and network of sewer systems and canals to channel water
quickly into rivers or the sea to prevent
flooding, MUS is based on the idea that it is
better to address the problem where it occurs (at the
'
source
'
) (see Fig.
10
).
flooding is of concern, the biggest issue for cities is massive
impermeable surfaces (paved areas, roads, roofs, etc.). Instead of in
When pluvial
ltrating, used
or evaporating water goes directly into the drainage system. In order to deal with
this problem, nature friendly solutions such as green roofs, green facades, rain
gardens, bio-swales, retention/detention ponds, wetlands and others are proposed.
There is great potential in connecting greenery, water features and the building
structures itself to channel water to various drainage features.
Rainwater can be (re)used, water can be harvested from roofs and other sealed
surfaces. Although there is strict control on harvesting rainwater for drinking, it is a
straightforward procedure to harvest
flushing,
washing clothes or for the washing of pavements and walkways. In this way, total
run-off from the site is reduced. If combined with the open water bodies, all rain-
water can be directed in that way so the problem becomes a useful resource.
rainwater
for
irrigation,
toilet
Pluvial flood reduction by BG solutions
Fig. 10
Pluvial flood risk reduction
Search WWH ::
Custom Search