How does empoldering reduce sand use in land reclamation?

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Empoldering Reduces Sand Use by Minimising the Need for Fill Material

Empoldering significantly decreases the reliance on sand in land reclamation by creating a contained area that can be drained and filled with alternative materials. This method contrasts with conventional land reclamation, which typically involves large volumes of sand to build up landmass. The project at Pulau Tekong, for instance, achieved a reduction in sand usage by nearly half compared to traditional methods.
Utilisation of Clay and Other Materials

A key aspect of empoldering’s reduced sand dependency lies in its ability to incorporate other materials. In the Pulau Tekong project, over 10 million cubic metres of clay, initially excavated for a stormwater pond, were reused as fill material. This reuse of on-site or locally sourced materials minimises the need to import vast quantities of sand, a finite resource often associated with significant environmental impacts.
Creation of a Contained Land Area

Empoldering involves constructing a perimeter, such as a coastal dyke, to enclose an area of land. This dyke, which in the Pulau Tekong project stands at six metres high, acts as a barrier against the sea. Once the area is enclosed, water can be pumped out, allowing for the creation of a land surface that lies below sea level, in this case, 1.2 metres below mean sea level. This structural approach means that the landmass is built up within a controlled boundary rather than by simply adding layers of sand to the seabed.
Engineered Systems for Water Management

The design of empoldered land incorporates sophisticated water management systems to maintain the reclaimed area. The Pulau Tekong site is equipped with a drainage network, pumping stations, and a stormwater pond, all engineered to cope with intense rainfall and the challenges posed by rising sea levels. These systems actively manage water ingress and internal drainage, ensuring the land remains usable and protected, thereby supporting the structural integrity without solely relying on bulk sand fill.

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How does empoldering reduce sand use in land reclamation?

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