Planning for water supply to Cyberjaya, Putrajaya and KLIA had been made on the basis that the initial and future ultimate demands will be served by the nearest major source works i.e. Sungai Semenyih Treatment Plant, via the balancing reservoir located within the said treatment plant. Owing to the need to ensure that the water supply to these prime development areas was maintained without disruption under any foreseeable circumstances, an alternative water supply system from different source was required. Towards this end, Sungai Selangor Water Supply Scheme, being the largest scheme serving the Klang Valley was studied and found to be able to supply water to these developments as an alternative source. The study also revealed that standby power generating plant shall be provided to the existing Sungai Semenyih Treatment Plant to enable continuous plant operation and production in the event of power failure.

The scope of works of the project comprised of the following: