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Case study 8.
Erosion Control |
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Purbeck revetment
stone | Client:
Glade Dale Executive Homes
Location: Pymore Village, Bridport,
Dorset
Description of Contract:
We were appointed by this developer to carry out various
in channel works within a new development at Pymore Village near Bridport. The
new houses are clustered around an old mill complex which is also being
converted into appartments. The Environment Agency had been involved in detailed
flood modeling of the site and they required work to be carried out to improve
the channel flows.
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During the revetment
process | Kingcombe Aquacare installed a total of 300 tonnes of
rock armour along both sides of the channel upstream of the main bridge into the
site. Some of this was installed adjacent to the discharge from the
river into the flood relief channel. This work was carried out using one of our
specialist excavators fitted with a grab attachment to place pieces of
lumpstone, up to 1 tonne in weight, into the bank. A large scourhole in the bed
of the river was also filled to provide an area of riffles downstream of the
main weir. Various areas of the bypass channel, fish pass and main channel were
all desilted using a combination of long reach and mini excavators, with the
silt being taken off site to a licensed tip. An existing reedbed, which provides
some flood storage, was partially cut to provide a more diverse and
sustainable habitat adjacent to the main river channel.
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Before work started,
upstream |
and
downstream | The Environment Agency had stipulated that the works to
the channel must be completed before the upstream migration of sea
trout began and that silt from the in-channel works was carefully
managed. By completing the project on time and to budget we improved
the biodiversity and flow characterisics of the river channel
without adversely affecting the progress of the main
contractors.
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The completed revetment works and
our specialist rock grab
Photo
courtesy of Kaye PR |
Removing the excess growth of
Phragmites Photo
courtesy of Kaye PR |
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