Wet and rainy day, good day to walk behind the falls. The water moves at 40MPH, is loud and has enough volume per minute to fill one million bath tubs. It would be receding at 1 metre per year had governments not intervened and diverted the water into the Welland canal and through a hydro electricity dam. Now the erosion is down to 1 foot per year. Thousands, 12,500 ish years ago the falls were 11km further down river.