Wandering Cascades
by Hanny Heim
Title
Wandering Cascades
Artist
Hanny Heim
Medium
Photograph - Art Photography
Description
Niagara Falls
The Niagara River connects Lake Erie to Lake Ontario. Niagara Falls, he plunges 190 ft in depth. The above-lying island Goat Island divides the falls into two parts. The US portion has an edge length of 1'191 ft, the Canadian of half a mile. The waters of the US portion falls 69 ft on a crash dump, which grew out of a rock fall 1954. The Canadian portion (Horseshoe) has a free fall height of 171 ft.
12,000 years ago, at the end of the last ice age melted the last great glaciers in the area and caused Lake Erie to overflowing. The melt water formed the Niagara River, which spilled out into Lake Ontario over the cliffs of the Niagara Escarpment.
The escarpment here has a geological rarity under the hard dolomite rock of the surface is softer shale. The waters at the foot of the cases erode the shale until the overhang of hard dolomite no longer holds and falls into the river bed. The erosion is approximately 6 ft. per year. In this way, since its inception, the falls have already been approached 6.8 miles Lake Erie. By partial diversion of the river to the water power plants a few miles distant, the falling down water volumes are reduced. Through the abstraction of water for power plants, the power of the falls has decreased and slows erosion.
Uploaded
February 18th, 2015
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