As potentially protracted court action looms over the Government's plan for the partial sale of Mighty River Power, history has once again proven tough to dislodge when it comes to the perception of the country's waterways.
Two distinct tributaries of thought about the status of rivers have now converged at the feet of the Government, but resolving property rights to flowing water in New Zealand is still a long way downstream, and may impede the Government's best efforts to proceed with the partial sale of Mighty River Power .
Amid all the splashing around by various interest groups over the issue of the customary Maori ownership of rivers, what has remained partially submerged are the very long histories that both Crown and Maori are the inheritors of when it comes to the perception of rivers. These go to the heart of the impasse.
The Crown's position has a pedigree that flows through British common law right back to its source in ancient Greece. There, around 500 BC, the philosopher Heraclitus observed that you cannot step into the same river twice because of the fact that the constant flow of rivers means the second step you take will inevitably be into a different body of water.
This view of the transitory character of rivers migrated to the earliest period of English common law, under which ownership of the riverbeds was vested with the Crown, while the water that flowed over them was effectively a public good. The waters were muddied slightly during the medieval period, however, when the right to navigate on a river trumped the right to other uses of these waterways. However, the demands of these two rights seldom collided in this period, and so there the matter lay, seemingly settled.