South Australia detached water rights from land title

Across the drought-prone Murray-Darling Basin, water extraction rights had traditionally been licensed as an attachment to the land itself — whoever owned a given parcel held the water right tied to it, and the two could not be separated.

The reflexive fixes were supply-side — build more dams and pipelines — which cannot outrun a fixed continent's rainfall, or administrative rationing by government decree during shortages, which substitutes a bureaucrat's guess about whose need is greatest for whatever price signal the water's actual value would otherwise send. South Australia's legislature took a different route: stop treating water as an inseparable feature of land ownership, and make it property in its own right, tradable on its own terms.

Severed water licences from land title, registering them separately, so water could be traded independently and flow to its best use.

Separate registration let water be sold without selling land, removing the barrier to trade.

During drought, price gaps between low- and high-value uses widen, making trade most beneficial.

A market price signal replaced bureaucratic guesses about whose need was greatest.

Environmental buyers could purchase entitlements, protecting river flows.

When a scarce resource is bundled to an asset it doesn't need, unbundle it into its own tradable right so it moves to whoever values it most.

A tradable water market grew across the Basin; by the 2010s government had bought ~20% of Basin entitlements for environmental flows. The reform became the blueprint later generalized nationally through the 2004 National Water Initiative and the 2007 Commonwealth Water Act, and Australia's water entitlement market is now cited by the OECD and World Bank as one of the world's most developed examples of separating a natural resource right from land ownership to let a market allocate scarcity.