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Figure 3.21 Annual Precipitation Norms, 1971 – 2000.
Riverine Flooding
Riverine flooding is defined as the overflow of rivers, streams, drains, and lakes due to
excessive rainfall, rapid snowmelt or ice melt. The areas adjacent to rivers and stream banks
that carry excess floodwater during rapid runoff are called floodplains. A floodplain is defined as
the lowland and relatively flat area adjoining a river or stream. The terms “special flood hazard
area” and “100-year flood” refer to the area in the floodplain that is subject to a one percent or
greater chance of flooding in any given year. Floodplains are a larger entity called a basin,
which is defined as all the land drained by a river and its branches.
Location
All of Region L is susceptible to flash flooding and riverine flooding. The surface waters of the
planning area flow through 2 water basins: The Kansas Lower Republican and the Marais des
Cygnes as shown in Figure 3.22 shows the Marais des Cygnes and Figure 3.23 shows the
Kansas Lower Republican.
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