Given Singapore's hot weather, much of our reservoirs' water would be lost through evaporation.

If 50 per cent of the exposed surface areas can be covered with an impermeable floating material, the overall evaporation would be reduced by 50 per cent.

This would quite significantly cut the amount of water lost through the natural process of evaporation.

Surely, it cannot be that nobody has thought of this easy way of conserving the water in our reservoirs.

Mak Ngow Chai