Which of the following is/are the possible consequence/s of heavy sand mining in riverbeds? 1) Decreased salinity in the river 2) Pollution of groundwater 3) Lowering of the water-table Select the correct answer using the code given below:

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CollectorBabu · Accepted Answer

Correct Answer: 2 and 3 only. ● The removal of sand from the river bed increases the velocity of the flowing water, with the distorted flow-regime eventually eroding the river banks. ● Sand acts like a sponge, which helps in recharging the water table; its progressive depletion in the river is accompanied by declining water tables in the nearby areas. ● Depletion of sand in the stream bed causes the deepening of rivers and estuaries, and the enlargement of river mouths and coastal inlets. It leads to saline-water intrusion. ● Sand acts as an efficient filter for various pollutants and thus maintains the quality of water in rivers and other aquatic ecosystems.

Which of the following is/are the possible consequence/s of heavy sand mining in riverbeds? 1) Decreased salinity in the river 2) Pollution of groundwater 3) Lowering of the water-table Select the correct answer using the code given below:

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