Hint: It is a barrier that stops or restricts the flow of water or underground streams. The reservoirs made by dams stifle floods as well as give water to exercises like water system, human utilization, modern use, hydroponics, and safeness. Hydropower is usually utilized in conjunction with dams to get electricity.
The percentage of precipitation of rain that can be stored in dams of India is 10%. Dams are used as a reservoir of water for agricultural, industrial, and domestic use. Hydroelectric dams are used to generate electricity using hydropower.
Additional information: The first purpose of retaining water is generally served by dams, while to manage or prevent water flow into specific land regions other structures like floodgates or levees (also referred to as dikes). The earliest known dam is the Jawa Dam in Jordan, dating to three,000 BC.
Early dam building happened in Mesopotamia and therefore the Middle East. Dams were wont to control the water level, for Mesopotamia's weather affected the Tigris and Euphrates rivers.
The Jawa Dam in Jordan is the earliest dam which is 100 kilometers (62 mi) upper east of the capital Amman. Initially, this gravity dam highlighted a 9-meter-high (30 ft) and 1 m-wide (3.3 ft) stone divider, which was upheld by a 50 m-wide (160 ft) earth defense. The structure is dated to 3000 BC.
So the correct answer is ‘(a) 10’.
Note: A dam also can be wont to collect water or for storage of water which may be evenly distributed between locations. Dams are often formed by human agency, natural causes, or maybe by the intervention of wildlife like beavers. Man-made dams are regularly ordered predictable with their size (stature), proposed reason, or structure.