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John M. Thatcher
1897
Scientific American
destructive effect upon the surrounding country. The water is drawn off by artificial canals and spreads quietly over the adjacent country. The Mississippi on the oth '1' hand works far Illore harIll in many of the inundated districts than any richness it may impart to the soil can compensate. If the velocity of the over flow waters exceeds a certain rate, it begins to exercise a loosening and cutting effect upon the soil, carrying away the rich 10aIll and laying bare the coarser gravel and
doi:10.1038/scientificamerican05291897-339a
fatcat:c3ra7mliqjd45d4l6wuwan4tpa