What Makes Niagara Falls' Power?

What ínákes Niágara falls' power possible ïs the fact that Lake Superior, i Lake Michigan, Lake Hurón and L;ike Erie, with a combiued área of 90,000 square miles, representing the reservoirs oí sojue 25ft;000 square miles of wafcersbed, aré sitnated. C00 feet above the sea leveí The great volumó öf water falliiig over the vast territory flows ou its natural coui'se to the Atlantic ocean with but a slight desoent, nntil it is brought into the narrow Niágara river, when, in the rapids just above the falls, it declines 55 feet and then, with a single plunge, drops into the abyss, 165 feet below. Eminent engineers havo coniputed that 275,000 cubic feet of water pass over the falls every second, representins in theoretical energry over 000