Aug 182010
As detailed here, at least 50% of the flow of the Niagara River must go over the Niagara Falls during the days from April through October.
That is, even with the United States and Canada having to share the water, the countries were still able to agree that a significant amount of water is needed over the falls to support tourism and the local economy.
But the Bala proponent would only allow 6% throughout most of the year. We should insist on much more, as the flow over the falls is what brings people to Bala.