Answer;
-These are positive impacts of dams to the society.
Step-by-step explanation;
-Dams are important because they provide water for domestic, industry and irrigation purposes. Dams often also provide hydroelectric power production and river navigation.
-Other positive impacts include; dam wall itself blocks fish migrations, which in some cases and with some species completely separate spawning habitats from rearing habitats. It also traps sediments, which are critical for maintaining physical processes and habitats downstream of the dam.