an increase in flooding downstream an increase in regional humidity a decrease in the amount of river ecosystems a decrease in the amount of water for irrigation
The construction of Hoover Dam on the Colorado River resulted in abundant freshwater and electrical power for the region. Which of these is a disadvantage of the construction of Hoover Dam?

Options:
- an increase in flooding downstream
- an increase in regional humidity
- a decrease in the amount of river ecosystems
- a decrease in the amount of water for irrigation

a decrease in the amount of river ecosystems