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Abstract:The relationship between Iowa’s roads and
drainage developed when rural roads were originally
constructed. The land parallel to roadways was
excavated to create road embankments. The resulting
ditches provided an outlet for shallow tiles to drain
nearby fields for farming.
Iowa’s climate and terrain are nearly ideal for
farming, and more than 90 percent of the land suits the
purpose. Much of the land, however, needs to be
artificially drained to achieve maximum productivity.
Most of this drainage has been accomplished with an
extensive network of levees, open ditches, and
underground tiles. The U.S. Census Bureau estimated
that as early as 1920 approximately nine million acres
of Iowa farm land had been artificially drained or
needed to be.
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