Why Is It Almost Impossible to Keep Water from Seeping
Why is it almost impossible to keep water from seeping under a levee and out onto a floodplain?
A) Bigger rocks are typically placed at the bottom of levees, and they are most permeable.
B) Levees are built on floodplains marked everywhere by old permeable stream channels.
C) People building levees often forget to line the stream channel with plastic.
D) Piping (large tubes) are built near the top of the levee to prevent overtopping.
E) Metallic walls that are placed into the ground rust and fail after two or three years.
How long before a flood can someone purchase insurance from the National Flood Insurance program?
A) one week
B) 30 days
C) 3 months
D) 6 months
E) 1 year
As dictated by current restrictions,what is the maximum amount the level of a 100-year flood can be encroached (raised)as a result of building?
A) 3 feet
B) 6 inches
C) 0.3 meters
D) 1 meter
E) 18 inches
What pattern exists in the annual cost of U.S.flood damages from 1910 to 2010?
A) an increase due to population increases and floodplain development
B) an increase due to a decline in building codes
C) a decrease due to restrictions on floodplain development
D) a decrease due to greenways, park systems, golf courses and ball parks
E) no increase or decrease due to subsidized flood insurance