Match the Following Options to Its Correct Definition

Match the following options to its correct definition.
-floodwalls

A) structures that increases the level to which a river can rise before it overflows
B) a type of channel alteration that allows water to flow out of the channel at specific points where it will not be damaging
C) gates that open and move water away from major population centers during times of high river stage
D) locally constructed reservoirs that decrease the rate at which surface water runs into rivers
E) a structure built to store extra discharge from a river; can be used to generate power, create a recreational area, and control water levels for shipping