Dams

• A man made structure built across a river in order to control the flow of water / use Water for irrigation. Following are the types of dam.
• Q.1 What are the natural factors that have favored the construction of dams and reservoirs.

  Ans. Deep valleys increases storage capacity / provides high head of water for hydel. Narrow valleys for dams reduces amount of materials required for dam. Solid rock for dams to support weight of dam. Large basins For water storage. Impervious rocks for reservoir to seepage of water. Low evaporation rates. Forested valley sides hold soil / slow rate of siltation. High precipitation/ rainfall / snowfall.