Project funded
by theEU–DGEnvironment
L
andsurfacerelevant
forapplication
Artificial surface
Agriculture land
Forest and semi-natural areas
Wetlands
F
inancialcosts
(C
apital
,
operation
&
maintenance
)
Basins and ponds are rather high land-take measures. One of the primary costs
is therefore the cost of
land acquisition
or the opportunity cost of not using
that land for development. Construction costs scale with the storage
volume
of
the basin/pond; references mention €44 000/ha. Since these basins have a long
lifespan, once in operation only minimal maintenance costs arise (about €58/ha/yr).
D
esign
Basins and ponds require large accessible and
relatively flat
areas. They can
have typical depth of 3-5 m and size around 500-5000 m3. However it depends
on the drainage area. The basin/pond floor should be made as
level as possible
to maximise storage and infiltration potential and minimise the risk of erosion.
Basins and ponds should not be sited on unstable ground and ground stability
should be verified prior to construction. They are more effective when primary
treatment is provided upstream
S
cale
The size of the basin/pond has to be
adapted to the drainage area
Detention basins and ponds are water bodies
storing surface run-off
. A detention basin is free from water in dry weather flow conditions, whereas a pond
(e.g. retention pond, flood storage reservoir, shallow impoundment) contains water during dry weather, and is designed to hold more when it rains.
Case studies:
;
HYDROMORPHOLOGY
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