米埔標誌：斑點魚郎 |
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基 圍 16/ 17 的 推 土 工 程
The problem of siltation is common amongst
all the gei wai, and was even recognised by the fishermen
who used to manage the Mai Po gei wai before WWF Hong
Kong arrived. Silt that comes with the water that is flushed
into the gei wai, particularly settles on the floor of
the perimeter channels and it has been estimated that these channels
are silting up by around 1.3 cm per year!. These channels provide
a deeper area of water for the shrimps and fish in the gei
wai, where they can avoid the heat of the summer and the
cold of water but if they were to become increasingly shallow,
then this will affect the survival of these shrimps and fish.
As a result, a dredger
on pontoon is used to dredge out the silt that has built
up in the channels on a periodic basis. In the case of gei
wai 7, the perimeter channels have not been dredged
for a long time even before WWF Hong Kong took over management
of the pond. As a result, the water channels in the pond
have silted up and are now covered with reeds. As a result,
Mai Po staff will be using a dredger on floating pontoons
to dredge this channel over the coming 12-months. However,
work will temporarily stop from November to April in order
to reduce disturbance to the migratory waterbirds. |
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The silt from the bottom of the channel
that has been dredged up, is usually placed on the side bunds
of the pond. In the case of gei wai 7, the bunds are now
heavily overgrown with trees and so trimming of some branches
will have to be carried out.
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