The main cause of the Rapid City flood of 1972 was:

A) rapid melting of glaciers in the Black Hills because of global warming
B) failure of a dam because of a large landslide into the reservoir
C) poor design and poor construction of a large concrete dam
D) intense rainfall from a thunderstorm that resulted in a flash flood
E) all of these

Rapid City Flood

A catastrophic flood event that occurred in Rapid City, South Dakota, in 1972 due to heavy rainfall.

Flash Flood

A local and sudden flood of short duration, such as that which may follow a brief but heavy rainfall.

Global Warming

Increasing global atmospheric and oceanic temperatures as measured or inferred from some point in the past to the present.