Singapore – Catching Every Drop of Rain

Singapore - Catching Every Drop of Rain


The source of the map of the rivers of Singapore is the Singapore PUB

As a small island that doesn't have natural aquifers and lakes and with little land to collect rainwater, Singapore needs to maximize whatever it can harvest.

Currently, Singapore uses two separate systems to collect rainwater and used water. Rainwater is collected through a comprehensive network of drains, canals, rivers and stormwater collection ponds before it is channelled to Singapore's 17 reservoirs for storage. This makes Singapore one of the few countries in the world to harvest urban stormwater on a large scale for its water supply.

The newest reservoirs are Punggol and Serangoon Reservoirs which are our 16th and 17th reservoirs. By 2011, the water catchment area has increased from half to two-thirds of Singapore's land surface with the completion of the Marina, Punggol and Serangoon reservoirs.

With all the major estuaries already dammed to create reservoirs, PUB aims to harness water from the remaining streams and rivulets near the shoreline using technology that can treat water of varying salinity. This will boost Singapore's water catchment area to 90% by 2060,

The goal is to capture every drop of rain (Figure 1)



Pandan Reservoir

Kranji Reservoir

Jurong Lake Reservoir

MacRitchie Reservoir

Upper Peirce Reservoir

Lower Peirce Reservoir

Bedok Reservoir

Upper Seletar Reservoir

Lower Seletar Reservoir

Poyan Reservoir

Murai Reservoir

Tengeh Reservoir

Sarimbun Reservoir

Pulau Tekong Reservoir

Marina Reservoir

Serangoon Reservoir

Punggol Reservoir


Singapore River

Sungei Kallang

Rochor River

Sungei Whampoa

Geylang River

Sungei Bedok

Sungei Ketapang

Sungei Changi

Sungei Selarang

Sungei Loyang

Sungei Tampines

Sungei Api Api

Sungei Blukar

Sungei Serangoon

Sungei Punggol

Sungei Tongkang

Sungei Pinang

Sungei Seletar

Sungei Khatib Bongsu

Sungei Seletar Simpang Kiri

Sungei Sembawang

Sungei Mandai

Sungei China

Sungei Mandai Kechil

Sungei Peng Siang

Sungei Tengah

Sungei Kangkar

Sungei Buloh Besar

Sungei Jurong

Sungei Lanchar

Sungei Pandan

Sungei Ulu Pandan



Figure 1. Overall Map of Singapore from




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