We have been threatening since the drought ended 3 years ago and the supply pipe burst last year, to put in some rainwater tanks. Well I bit the bullet and we have a 2500L tank on either side of the house.
I had to make some adjustments to the irrigation system so that it can work of the municipal supply and from the tanks. I bought a pump that I can move between the tanks and it seems to have plenty of pressure. The first time I used it it popped off 7 irrigation heads!
Typically we have had no rain since the tanks have been installed so I have pumped some of the pool water into each to make sure everything works. So far so good. Now the wait for rain!