We moved in to our house well over three years ago and in that time we've been running the house on tank water. The roof is a great design for harvesting rainwater and it doesn't take much to fill up our 22,000L tank. It always seems like a bit of a waste when water goes into the tank and straight out the other side when it's full.
We've only had to switch over to town water once, early this year, and that was only for a brief time. It came after quite a dry spring and a stretch of larger than usual water use. Who knows what the weather will bring us in the future? So for a while we've been considering getting a second tank. We have also decided to build a garage, which will have extra rain harvesting capacity which will go into our tank.
I've been working away with my available moments at preparing a base for the tank using the rubble from the ancient concrete which was pulled up from our floor and it's very satisfying to make use of that. We have a gentle but definite slope on our block so it's necessary to use a good amount of material to make the base level. Having done that I topped it with 2 cubic metres of 20mm stones to give the tank something forgiving to rest on that I could easily rake into a nice flat surface.
I'd only just done this when the calm weather required to transport a big tank on a truck arrived and very quickly we had the tank down and filling up with a bit of water from the other tank. This is needed to weigh it down enough to stop it blowing away in the crazy winds we can get in these parts. I've worked out how to plumb it so that I can switch the in flow to either tank as well as directing the overflow from tank one into tank two. And if it overflows from tank two, we've got some trees downhill from the tank that will be very happy about that.