Transboundary

A series of dams on the transboundary Mekong River has reduced water levels, damaging fisheries and causing other environmental problems for the people who depend on the waterway for their livelihoods and food.

Emphasizing that it has applied equitable apportionment to not only rivers and streams but also to interstate river basins, to groundwater pumping that affects surface water flows, and to anadromous fish like Chinook salmon and steelhead trout, the court stated that equitable apportionment applies only when transboundary resources are at issue.