While rainwater harvesting is a good idea, the cost is a big barrier. Instead, we can re-use water.

eg, the last rinse from the washing machine. The water clean enough to mop floors, flush toilets, wash cars, etc.

Have the washing machine on the first floor channel the rinse water to large container in the bathroom.
http://renovationmalaysiahq.com/water-problem-in-malaysia/

Well there are a few points worth mentioning

1. Rain fall at wrong location i.e. in towns etc but not in catchment area. So we have flash floods but not water woh. Harvesting some rain water will help. Act of God, urban migration or over development? You decide.

2. Non revenue water lost at 33% means water lost from treatment plant bcos pipe bocor. Water players did not replace pipes cos high investment blah blah,
http://www.yeobeeyin.com/2014/03/current-w...-of-god-by.html

3. We use too much water per person on "average". If you are water thrifty, congrats, not talking about you. So on average everyone also need to reduce use or reuse water. Those industry that use a lot of water, maybe charge them more?

4. Pollution dump into river so treatment plant cannot handle. Shut down. Responsibility of DOE? http://www.thestar.com.my/News/Nation/2014...reatment-plant/

5. RM4 billion or is it 10 billion now, water pipe from pahang to selangor. Don't know which figure is correct
If give the money to each household to collect rainwater, is this big pipe needed?
http://www.thestar.com.my/story.aspx/?file...1155&sec=nation
http://nakedeyeview.com.my/water/Getwaters...ritiesright.htm

Greater Klang Valley population is 7.2 mil. Say 3 person 1 house there's 2.4 mil homes. Give RM3k subsidy to build rainwater harvesting system in each house 2,400,000 x 3,000 = RM7.2 billion
Not sure calc boleh pakai or not :-) Anyone with better figure, pls correct.

This post has been edited by trinity3: Apr 15 2014, 12:20 PM