busterwa said...I dont understand why more people dont just collect rainwater (rainwater harvesting) you can virtually live of the beautiful rainwater in the winter months for the price of a 10/000litre tank and a small pump. In our area there is no scheme water. Most people have 100000 litre tanks to store water.
Cant beat rainwater fellas.
Plumb the house pipes into the rain water tank.
If you're using the water for things that aren't seasonal then 10kL is way too big for a normal house.
Rain tanks don't make sense in Perth or a lot of other places in Australia. In Perth, 50% of a house's annual water use happens in summer when we don't have any rain.
Studies have been done which calculate the cost of water from tanks in Perth at about $5/kL (and I reckon even then they're being too easy on rainwater harvesting). Water Corp will sell you 1 kL for about $1.50.
By my (admittedly very rough) calcs, if every house in Perth put in a tank it would cost about $1.4 billion to set up and would have very high ongoing costs relative to a reticulated supply. The tanks would produce about 40GL/yr (about the same as a desal plant which costs about $0.4 billion). That leaves $1 billion to set up a renewal energy source to run the desal plant (besides, rainwater tanks also have power requirements if set up with a pump - and if they're not set up with a pump then they're a very poor alternative to a reticulated supply system anyway).
Rainwater tanks aren't a new idea. The reason we have a reticulated water supply system that services everyone rather than individual rainwater collection is simple - if everyone pools their funds to set up a reticulated supply (such as we and every other major town/city in the developed world has/does) we end up with a more reliable system which produces water which is cleaner, cheaper and easier to manage than everyone catching and using their own rain.