When nobody is looking at night, it pretty much stops.
Reducing water flow helps to preserve the falls too. The water has substantially changed their shape, even over a time period of 2-300 years: https://www.marriottonthefalls.com/blog/2015/02/06/rate-eros...
During the Post-Great Big Blackout period, the Falls power generation ran with night-time levels of diversion during the day-time. The tourist boats that go near the falls got furloughed.
Reducing water flow helps to preserve the falls too. The water has substantially changed their shape, even over a time period of 2-300 years: https://www.marriottonthefalls.com/blog/2015/02/06/rate-eros...
During the Post-Great Big Blackout period, the Falls power generation ran with night-time levels of diversion during the day-time. The tourist boats that go near the falls got furloughed.