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G.
Water
Resources
100 Year Floodplain
The 100 year floodplain is the area the stream will occupy when a 100 year
flood occurs. The hundred year
floodplain is an area of land that has a probability of 1:100 of flooding to
that point in any given year. In
other words, in any given year there is a 1:100 chance that the stream will
flood the 100 year floodplain. The
100 year floodplain in the Darby Watershed covers approximately 24,700 acres.
Map 8 displays areas within the watershed that lie in the 100 year
floodplain. In recent years portions
of the Darby Watershed have seen floods that extend to or beyond the defined 100
year floodplain. The accurate
identification of these areas is critical to the protection of human health and
well-being as flood intensities and frequency increase.
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