Underground Water Storage: Tanks, Dams, and Cisterns for Australian Properties

Underground Poly TanksUnderground poly tanks installed below ground maintain cool temperatures (extending the life of stored water), do not take up above-ground space, and are structurally stable from underground pressure. Costs: 10,000L = $2,000–$3,000 installed; 25,000L = $4,000–$6,000 installed. Installation requires excavation — typically a backhoe for half a day. Underground tanks must be specifically rated for underground installation (above-ground tanks are not strong enough to resi…