Coastal Flood - Hurricanes and tropical storms
can produce heavy rains, or drive ocean water onto land. Beaches and coastal
houses can be swept away by the water. Coastal flooding can also be produced
by sea waves called tsunamis, giant tidal waves that are created by volcanoes
or earthquakes in the ocean.
Flash Floods in Arroyos - An arroyo is a water-carved
gully or a normally dry creek found in arid or desert regions. When storms
appear in these areas, the rain water cuts into the dry, dusty soil creating
a small, fast-moving river. Flash flooding in an arroyo can occur in less
than a minute, with enough power to wash away sections of pavement.
River Flood - Flooding along rivers is a natural
event. Some floods occur seasonally when winter snows melt and combine
with spring rains. Water fills river basins too quickly, and the river
will overflow its banks. Often the land around a river will be covered
by water for miles around.
Urban Flood - As undeveloped land is paved for
parking lots, it loses its ability to absorb rainfall. Rain water can
not be absorbed into the ground and becomes runoff, filling parking lots,
making roads into rivers, and flooding basements and businesses.