My family lived at 17 Bremer House, Wong-nei chong rd, Opposite Hong Kong Happy valley race course, Navy Married Quarters.
The water supply was a problem for everyone. It was turned on for four hours every three days . when we would fill the bath and every imaginable container and each of us take a shower.
On alternate days we had to wash down and rinse off with a bowl of water.
Other less fortunate consumers topped up with canister's at street standpipes or used well water. Shek Pic Reservoir on Lantau Island, with its 5,000 Million Gallons was the largest water containment site. The average usage per person (Including Industrial use) was Nine Gallons per day or 40 litres. Additional water was collected by tankers at the lowest salinity point in the Pearl River in Communist China. Fortunately the the water problem has been resolved in Hong Kong. This was done by reclaiming part of the coastline sea area, and creating a huge Dam.
Something similar could be constructed on the Central Coast, Where 90% of our rainfall ends up in the sea anyway.
A project of this magnitude would provide ongoing employment long into the future.
This Project could be funded mainly by the Federal Govt from funds extracted from a few wasteful foreign aid programs.
BTW I hope this knowledge helps you appreciate your generous water allowance of Forty Gallons or One hundred and fifty litres per day.
John Leonard Spencer.