What is NOT a reason that a levee originally built to contain a 100-yr flood would be insufficient?
a. ?Major floods occur more frequently as areas are developed.
b. ?Floods larger than a 100-year flood can occur at any time.
c. ?Flood levels generally rise over time.
d. ?Sediment deposited by tributary streams degrades the levee.
e. ?Levees are of varying quality.
ANSWER: d
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