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3rd International Rainwater Cistern Systems Conference
Khon Kaen, Thailand - January, 1987

Section C: Design

Paper C.10

The Utilization of High-Rise Building Rooftops for Development of a Dual-Mode of A Water Supply In Singapore

Adhityan Appan
Lim Kiat Leong
Loh Sing Kit

Nanyang Technological Institute


In this study, rainfall data of a new town in Singapore was analysed and a computer program developed to relate rainfall to roof area and demand. The main objective was to develop a dual mode of supply ensuring that the rainwater is used for non-potable purposes like flushing of water-closets. If the rainwater is depleted, an electrically operated mechanism will activate pumping from the cistern containing potable water to the rainwater cistern and the non-potable requirements will be satisfied.

From the computer runs, it was ascertained that in the representative 12 storey high-rise buildings, 5.5% of the domestic demand can be saved by implementation of this dual mode of supply. It is also shown that such a system is more effective in a 4 storey building. The water from such systems will be cheaper but it has to be ensured that the mechanism developed should be very reliable and ensure effective and continual water supply to the rainwater cistern.

PDF of full document (14pp, 270kb)

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