Nor abridge right to use water

"100. The Commonwealth shall not, by any law or regulation of trade or commerce, abridge the right of a State or of the residents therein to the reasonable use of the waters of rivers for conservation or irrigation." [The Australian Constitution,63 & 64 Victoria, Chapter 12]

This appears to be the principal instrument protectively standing between the Clarence Valley and the Prime Minister's blatant attempt to raid Clarence catchment water.

The framers of our Constitution were remarkably prescient on the subject of water.