(i) The dams were constructed to control floods but it has triggered floods due to sedimentation in the reservoir and due to dam failure. Release of water from dams during heavy rains aggravated the flood situation in Maharashtra and Gujarat in 2006.
(ii) Multi-purpose projects induced earthquakes, caused waterborne diseases and pollution resulting from excessive use of water.

(a) Scarcity of water: Due to high population, increasing urbanization and rising standard of living, there is a growing scarcity of water felt all over India.
(b) Use of degraded water: In many areas, people are forced to drink and use polluted water which causes various water borne diseases.
(c) Lowering the water table: Increased use of tube wells in recent years has lowered the water table and has caused depletion of underground water resources.
(d) Inadequate supply water for irrigation, Two third of the cropped area in India is still rain-fed, which is uncertain and irregular which affects agriculture.

(i) All water that is used primarily ends up in the sea. From there, it enters the hydrological cycle in the form of water vapour. Freshwater is renewed by this cycle when precipitation occurs. Hence, water is a renewable resource.
(ii) Water scarcity or water stress occurs when availability is not enough to match the demand for water. It is caused by an increase in population, growing demand for water, and unequal access to it.
(iii) Multipurpose river projects help in irrigation, electricity production, flood control, inland navigation and fish breeding. However, the reservoirs destroy local flora and fauna. Many native villages are submerged, and people lose their livelihood, with little or no hope of rehabilitation.

(i) All water that is used primarily ends up in the sea. From there, it enters the hydrological cycle in the form of water vapour. Freshwater is renewed by this cycle when precipitation occurs. Hence, water is a renewable resource.
(ii) Water scarcity or water stress occurs when availability is not enough to match the demand for water. It is caused by an increase in population, growing demand for water, and unequal access to it.
(iii) Multipurpose river projects help in irrigation, electricity production, flood control, inland navigation and fish breeding. However, the reservoirs destroy local flora and fauna. Many native villages are submerged, and people lose their livelihood, with little or no hope of rehabilitation.

Water becomes a renewable resource through the hydrological cycle. Freshwater is mainly obtained from the surface runoff and groundwater is continually being renewed and recharged through the hydrological cycle.

Rainwater harvesting in semi-arid regions of Rajasthan is carried out in the following ways
In arid and semi-arid regions of Rajasthan, agricultural fields were converted into rained Storage structures.
These allowed the rainwater to stand and moisture the soil like the Khadins in Jaisalmer and Johads in other parts of Rajasthan.
Rooftop rainwater harvesting was commonly practised or store drinking water in semi-arid and arid regions of Rajasthan, particularly in Bikaner, Phalodi, Barmer and across the towns and villages of the Thar desert.
Every house in these regions had underground tankas to store the water for drinking purposes.
These tankas are large and deep tanks which were built inside the main house. They were linked to the sloping roofs of the houses through a pipe. Rainwater falling on the rooftops would a pipe. Rainwater falling on the rooftops would run down through the pipe and collect in the underground tankas.
The collected rainwater was stored in the underground tankas providing drinking water till the next seasons. When all other sources have dried up, these tankas were beneficial to beat the summer heat as they kept the rooms cool.