Question

All of the following are advantages of dams except
A. flood control
B. recreation
C. hydroelectric power
D. enhancing natural spawning patterns of fish

Answer 1

Hint:- Dams are the structures which are constructed across the rivers, streams, and along estuaries to store the water and to use the stored water for various purposes, and these dams are of many types based on the plan of construction and distinct material used for the construction, etc.

Complete answer:
Dams have many advantages and it is the reason they cost more for the construction as well as maintenance.
Advantages of Dams:
1. Dams are generally used to preserve the water, and this water is used to produce a large amount of hydrostatic power.
2. Whenever there are conditions such as droughts and dry climates and whenever there is heavy precipitation, these dams are used to help the retain water supply.
3. The technology with which dams are constructed provides us critical recreational opportunities.
4. Dams can be used for commercial activities like boating and these are used as destination places to have picnics.
5. A well-constructed dam provides several flood control benefits, where they prevent property loss while reducing the risk to humans life from annual flooding events.
6. The water that is preserved in the dams gives way to irrigate the water to croplands, whenever there are fewer rains or droughts.
7. Dams on rivers are used to provide a stable system of inland water transportation.

Disadvantages of dams:
1. To construct a dam it occupies a large amount of space, which may displace many people.
2. Reservoirs behind the dams can lead to higher greenhouse emissions.
3. If construction is not appropriate these dams may fail and may create a flooding risk.
4. These dams hurt the ground water table.
5. They are very expensive to construct and it is very challenging to maintain the dams.
So, the correct option is D.

Note:- Construction of dams have both advantages and as well as disadvantages, but the correct plant and proper design and technology of dams provide more advantages, but to have proper planned constructed dams, they cost more, still they help us in various ways.