How are the excess water being drained?
Firstly, before drainage can be carried out, dikes need to be built around the area being reclaimed to prevent
more water from going in.
After which, the area can then be drained by pumping out the water, or constructing artificial channels
called drainage canals.
Drainage canals carry excess water away from the reclaimed area to a nearby river or sea.
What is done after the water is being drained from the area?
An area that has been drained is usually lower than the surrounding areas. Therefore it is necessary
to replace the water withdrawn with fill material as it is prone to becoming filled with water again.
Sand and rocks are fill materials which are most conveniently obtained from nearby hills
which are also levelled out in the process. Sand and gravel from the seabed can also be used as fill material.
What problems are there by reclaiming wetlands?
Natural habitats are lost over the process as these wetlands provide habitats for wildlife.
A problem with severe flooding may be faced as the area being drained may get flooded with water again.
What can reclaimed wetlands be used for?
Reclaimed wetlands can be used for recreation, housing, industry and agriculture.
Some reclaimed wetlands are Tanjong Karang in Malaysia, and U.S.A in California.