Insulated concrete forms used to make flood walls in the Sioux City, Iowa, area could prove to be more economical than traditional flood wall building methods. Authorities built two dikes -- the one made with ICFs cost $28,000, while the traditional earth dike cost $1.6 million. South Sioux City's city manager wants the Federal Emergency Management Agency to approve ICF dikes, but as of now the city's ICF dike has to come down. The city has requested permission from FEMA to leave at least some of the wall -- which uses ICFs from locally-based Lite Form -- in place.

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