usually reenforced concrete
People mainly build dams to make energy. The dam converts water to energy. Dams are also used to contain water to prevent flooding. It also allows the water to be used for irrigation of crops and recreational uses.
yes
Wherever there are mountains, rivers and dams.
they make use cause they don't used that much water
Rivers can be used for many things. Travelling (boats), dams, energy, water mills, water for cooling, and as a water source.
Short answer- both. Dams can interfere with the migration of fish, and cuase rivers to silt up. However, dams are also used to control flooding, supply water and power.
They can assist in controlling flooding on many rivers. Dams can by used to create hydro-electric power. The lakes created are often great recreation areas.
Weirs are man made obstacles in rivers. They are similar to dams as they allow water to pool behind them and let water flow over them. They are used to alter the flow of a river to make it navigable.
Hydropower, thanks to one of my Classmates.
Hydropower, thanks to one of my Classmates.
Dams are not used in every country in the world. However, they are commonly found in many countries with ample water resources and a need for water management, irrigation, hydroelectric power generation, or flood control. The presence of suitable geographic conditions, such as rivers or valleys, often determines the feasibility and prevalence of dams in a country.
No, dams are man made barriers constructed to stop the flow of water. Very often these are across rivers in order to create a lake for drinking water called a reservoir (UK). Dams are often used to create electricity via hydro-electric turbines and generators.