How do these dams harm the ecosystem?

Answer 1

A dam is a wall of solid material built across a river. As a result water is stored in a lake that will form upstream of dam. The main purpose of the most of the dams is to create a reservoir of water to use at a later time. There are different types of dams like concrete dams, arch dams and earth dams. The design and construction of a dam depends upon its purpose and location as well as materials and workforce available.

A dam must be waterlight, and must be also stable. The dam wall must have sufficient strength to firstly bear its own weight and secondly to resist the water pressure in the lake upstream of the dam. It must have an outlet valve to release water in controlled amounts as required. It also needs a spillway so that large volumes of flood water can flow around it without causing any damage to the structure itself.

Dams are extremely useful to us for they help to control floods and supply water to dams and cities. Dams also generate hydroelectric power, and the water stored in the lake is useful for irrigation of crops. The lake that forms behind the dam can be useful for water sports and leisure activities. Often, large dams become tourist attractions of their own sight.
Dams are helpful for us because the direct where the water flows to other places that don't have water

Answer 2

Dams harm the ecosystem by changing the rivers and streams flow. They prevent migrating fish from reaching spawning areas. They can lower the water level so low fish are left without enough water to survive or stranded on land. Dams also alert landscape around and being them creating lakes were their were none, and dry land that was once under water.

Answer 3

because if it was too low the water will spread and we will have a flood.

AND Some dams are built where a river flows through a steep sided valley this limits the area consumed by the lake that is formed, minimising environmental impact. To confine the biggest volume of water possible the dam needs to be high, this also can be useful for hydro electric facilities due to the immense pressures involved with such a concentrated volume of water...

Answer 4

They are both good and bad.

Good

- can give off electricity

-flood control

-can be used for irrigation

-water and etc

Bad

-fish cant go upstream to lay eggs such as salmon. (some dams may have a fish ladder for that problem)

-very expensive and takes a lot of time to build

Really its up to you on how you see them. I like to think of them as good ,they are very beautiful sometimes and they dont make them any more plus all the good things they do. their are plenty of things they do soo like i said its up to you

Answer 5

Dams can be beneficial to the environment because it helps with biodiversity. This is because it creates a still body of water allowing new organisms to grow.

Answer 6

dams are bad because they can flood the land around it,also can stop the correct speed of the river it is connected to.that is why i think dams are bad!

Answer 7

Probably not because beavers build dams too.

Answer 8

because

Answer 9

you dont tell