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Custom Soil Resource Report <br />conditions (the chance of flooding is 5 to 50 percent in any year); frequent that it is <br />likely to occur often under normal weather conditions (the chance of flooding is more <br />than 50 percent in any year but is less than 50 percent in all months in any year); and <br />very frequent that it is likely to occur very often under normal weather conditions (the <br />chance of flooding is more than 50 percent in all months of any year). <br />The information is based on evidence in the soil profile, namely thin strata of gravel, <br />sand, silt, or clay deposited by floodwater; irregular decrease in organic matter content <br />with increasing depth; and little or no horizon development. <br />Also considered are local information about the extent and levels of flooding and the <br />relation of each soil on the landscape to historic floods. Information orr the extent of <br />flooding based on soil data is less specific than that provided by detailed engineering <br />surveys that delineate flood-prone areas at specific flood frequency levels. <br />34 <br />