Singapore has two separate systems to collect rainwater and used water. Rainwater is collected through a comprehensive network of drains, canals, rivers, storm-water collection ponds and reservoirs before it is treated for drinking water supply. Thus, it is of paramount importance to keep waterways and reservoirs clean.
After a heavy downpour, the waterways often turn brown. This is because silt gets washed down from exposed earth surfaces and construction sites. To tackle the problem of silty discharge, PUB has been working with the construction industry on concerted efforts in public education and engagement, technology upgrading, and enforcing good earth control measures.
To promote awareness, PUB jointly held seminars with the Construction Industry Joint Committee (CIJC), a grouping of eight associations in the construction industry, on erosion and sediment control.
To raise professionalism in soil erosion practices, PUB amended its Code of Practice on Surface Water Drainage in 2007 to provide more guidelines on how developers and contractors can effectively apply appropriate earth control measures at worksites. Now, developers and contractors submit to PUB appropriate earth control measures designed and endorsed by Qualified Erosion Control Professionals before the start of any construction work.
PUB and the Singapore Contractors Association Limited also jointly published a new guide book on erosion and sedimentation to highlight basic erosion control measures that contractors can adopt at construction sites to prevent silt discharges into waterways.