Land Reclamation

The government were concerned that the existing airport was located at Payar Lebar is in an area with potential for urban growth. The government then decided to build a new airport in 1975, at the eastern tip of the main island at Changi, at the existing site of Changi Air Base, as it would be easy to expand through land reclamation to creates more land for the aircrafts and the three terminals as there was an increase in traffic, the airport still had to be expanded. Moreover, airplanes could fly over the sea, avoiding noise pollution issues within residential areas like Paya Lebar and helping to avoid disastrous consequences.
According to wikipedi, the whole land reclamation project was led by PSA chairman, Howe Yoon Chong. Landfill methods were used to reclaimed land in Changi.
Landfill
A landfill is used to create land by draining waterlogged areas such as swamps and marshes and filling them with material like sand to form dry land.
A detailed process
Led by PSA chairman Howe Yoon Chong, land-reclamation works involving over 52,000,000 square metres (559,700,000 sq ft) of landfill and seafill began in June 1975, even as the airport at Paya Lebar was still in the midst of expansion works. About 2 km2 (0.77 sq mi) of swamp land was cleared and filled with 12,000,000 m2 (129,200,000 sq ft) of earth from the nearby hills, while another 40,000,000 m2 (430,600,000 sq ft) of sand from the seabed were used to reclaim land. The contractor was PentaOcean Construction (五洋建設), a Japanese construction firm directly involved in numerous land reclamation projects in Singapore. Canals were built to drain water from three rivers, Sungei Tanah Merah Besar, Sungei Ayer Gemuroh and Sungei Mata Ikan. In total, 8.7 km2 (3.4 sq mi) were reclaimed, raising the total site area to 13 km2 (5.0 sq mi). Of this, landfill accounted for 2 km2 (0.77 sq mi) while seafill represented 6.7 km2 (2.6 sq mi). The construction also demolished 558 buildings, exhuming around 4,100 graves, a 38.1 centimetres (15 in) gun emplacement at Changi, and diverting the three streams to the western side of the former Royal Air Force runway, which was to be used for the new 4,000 metres (13,123 ft) runway. All of these works were completed in May 1977,(adapted from wikipedia)
Chloe