I suggest that we increase our rainwater collection to the open space on the roof of every Housing Board block.
The water collected can be used to clean or wash the common areas, thereby saving the reservoir water for human consumption.
In fact, such rainwater can also be converted to drinking water in the event of an extreme water shortage via simple water purification.
It would be a waste not to use the large space occupied by HDB blocks.
Thomas Tan Chay Ann