Before perfecting his idea for a safety razor, King Camp Gilette (1855-1932) developed some radical concepts for utopian cities. Chief among them was a giant city called "Metropolis," built on, and powered by, Niagara falls.
I just learned about this recently, and knew nothing of it when I came up with Waterfall City.
Gilette's Metropolis would consist of a central manufacturing facility owned by the public. The residence areas would be large enough to accommodate sixty million people. Potentially, this city would be the only one necessary for the United States.
"Under a perfect economical system of production and distribution and a system combining the greatest elements of progress," he said, " there can be only one city on a continent, and possibly only one in the world."
The structures would be arranged like a giant beehive, and uniformity could be alleviated by allowing individual building to vary in color.
Gilette wrote: "The buildings of the city have their foundation in the ground, but the buildings proper rise above the upper platform. The people do not feel conscious of the elevation above the surrounding country; for the platforms, in anticipation of the city's growth, extend out beyond the city proper beyond the range of vision. There is absolutely no way by which dirt or dust can find its way into the city in any appreciable amount. There are no traffic vehicles of any kind in the city except the electric transportation system of the middle chamber and rubber-tired electrical carriages and bicycles."