Browse Forums Building A New House 1 Oct 18, 2007 2:35 pm I know this has been discussed in various threads before but I am still trying to organise one or more rain water tanks.
I am looking to have somewhere between 50000L and 80000L which I would like to have stored under decking (which will be around 10m by 5m). I wanted to go with a couple of 45000L concrete tanks which would be poured on site ($4125 each) but it seems that access will be a problem - they need to use a crane to lift the template and of course get the huge truck up to the block too. Without getting too expensive, can anyone recommend anything else? Bladders seem to be limited on capacity per sqm. Ideas very welcome Re: Tank you 2Oct 18, 2007 2:40 pm 3XB,
Could you perhaps join several large poly tanks together (using pipes) and achieve it this way? What about the guys who poured your slab? Could you use precast perhaps and seal it with something? Re: Tank you 3Oct 18, 2007 2:47 pm Friend of mine is thinking of putting one under his driveway near the front of his block. He needs to re-do driveway anyway, so why not dig a big hole and drop a tank in it. Then concrete over the top with an access hatch in the driveway.
8000 gallon (20,000l ? ) tanks come pre-made. Perhaps you could buy 2 to get 40,000l worth? Then run pipework to pump wherever you wish to put it. Re: Tank you 4Oct 19, 2007 7:35 am under driveway tanks are about 3-4 times the price of regular poly tanks because they have to be able to support the weight of the concrete + cars
we looked at it - way too expensive - even for a small 10,000L system it was $15k (that was about 18 months ago - may be cheaper now) Re: Tank you 5Oct 19, 2007 7:47 am stonecutter1309 under driveway tanks are about 3-4 times the price of regular poly tanks because they have to be able to support the weight of the concrete + cars we looked at it - way too expensive - even for a small 10,000L system it was $15k (that was about 18 months ago - may be cheaper now) Price he got for the tank was around 5k. Then excavation etc. When you consider a 2000l tank nowadays will set you back over $1k then it doesn';t seem that pricey. Assuming you'll use all that water of course. He is going to put in 4 piers to support the driveway along with the reo (obviously) in it as well Re: Tank you 6Oct 19, 2007 8:23 am We put our underground in the back yard. Our builder includes 5000L (2xtanks) above ground with concrete base. To upgrade to a 10000L and put it underground was only an extra $500 which seemed very reasonable. Maybe there is an area in your yard that doesnt carry the same weight that a driveway will? - although ours is guaranteed to withstand a truck driving over it (not that we have much cause to be driving trucks around our backyard). Re: Tank you 7Oct 19, 2007 1:40 pm Al Price he got for the tank was around 5k. Then excavation etc. When you consider a 2000l tank nowadays will set you back over $1k then it doesn';t seem that pricey. Assuming you'll use all that water of course. He is going to put in 4 piers to support the driveway along with the reo (obviously) in it as well The tank part was relatively cheap - but it was the excavation and everything that went with it that was expensive. If you can get mates rates on excavation - then no worries! Tanks that go under your back lawn are a lot cheaper than under driveway (Bushmans do huge underground tanks) - but there's still excavation costs. There's also a lot of Work Cover saftey equip involved because the hole is more than 1.5m deep. From the websites I've read, a 20,000L tank should definitely be able to run a house for a year - especially if you've got greywater recycling. Re: Tank you 8Oct 19, 2007 2:24 pm stonecutter1309 From the websites I've read, a 20,000L tank should definitely be able to run a house for a year - especially if you've got greywater recycling. When I was young ... we were a family of six with around 10,000-15,000L worth of water tanks (600mm annual rainfall). The tanks collected all of the water from a 12sq house roof (think the gutters all sloped to one end of the house - no downpipes other than those heading into the tanks!). No dishwasher or automatic washing machine, but we did have a significant vegetable patch. In a dry summer the tap to the toilet cistern (with elastic band restricted flush) would get turned off completely ... bucket flushing with grey water only (from the twin tub washing machine)... ah... sweet memories! Needed a truck full of town water in really dry summers, cheap when you have your own truck, wouldn't want to do it now! What sort of rainfall zone are you in? Can't imagine needing more than 40,000L of storage capacity if you have efficient appliances. Had a friend who moved from suburbs out to a small property and kept complaining about how quickly their water ran out. Turns out that they only ever used a towel once and then it went straight in the washing, even if just drying their hands. Didn't take long for them to break that habit! 18 90480 From what I know about water tanks (I've been working with a client on them for a few years now) is this - The concrete can last a lifetime if they don't crack for some… 2 10629 Thanks for letting us know. The programmer will have a look at this later today. 2 6682 |