The building of a dam in Egypt's Nile Valley has controlled the periodic flooding there, but has also stopped silt from fertilizing farmland, which has wreaked havoc with the ecosystem. To alleviate the problem, three design students from Nantes, France, have developed a concept called the Silt Lake City, a "hydropolis" that consists of "a series of modular floating structures that take advantage of the rise and fall of the waters" and includes systems to allow water and silt to irrigate and fertilize farmland. An enveloping seawall would serve as protection for the floating cities and a connection to shore.

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