Question

Percolation tank is
A) Earthen dam
B) Concrete dam
C) Woody dam
D) None of the above

Answer 1

The conservation of water is a very necessary step taken by the government and also by the people to save the water. There are many techniques that have been accepted for the storage of water and most important techniques are rain and ground water harvesting.

Complete answer:
To answer this question, we have to first know about the water storage tank. The water storage tank or the water reservoir is the tank used for the storage of water for the conservation. In such tanks, the water by reverse osmosis process gets stored until the water demand is started. That water is pumped inside the tank with the help of water sources like well. The tanks used in this process are either atmospheric tanks or the pressure tank.
Let’s discuss how this pressure tank works; the pressure tank uses the compressed air to form the water pressure inside. The tank is constructed as a bladder or air chamber with a pre-charge pressure. As the tank gets filled with water it results in the compress of the air, the continuous compress of air produces pressure inside the tank. Once the internal pressure is reached to a certain mark it signals to cease the delivery of water. If the pressure tank is used to store the well water the tank will signal to pump off the well to turn back on and if it stored the reverse osmosis water it will signal the RO system to restart the production. There are many other ways of storing water for conservation and the rain water harvesting is one of them.
Now, percolating tank is an artificially prepared reservoir that is constructed across the stream that submerges the land with proper permeability to maintain the enough percolation to collect the surface water. These are earthen dams that formed as masonry structures for spillway and also constructed over the stream. The percolating tanks must be made in a terrain with weathered rock for recharge fast, very high permeability can cause escaping of the percolating water downstream to produce surface flow, the aquifer that to be recharge should have proper permeability thickness for the accommodation. The area must have sufficient number of pumps and wells.
The concrete dams are also considered as gravity dams built with the help of large concrete blocks to reduce the thermal stress and convenience. Such types of dams are formed in large rivers to produce electricity by blocking the water current.
Woody dams are prepared in small rivers and streams and involve storage of water in landscape either in soil or rivers and also intercept the rainfall to reach to the river and slow the water rate off the land into the water.

Thus, the correct answer is option ‘A’. Earthen dam.

Note: The concrete dams are also termed as gravity dams mostly built in large blocks divided by joints to make the construction highly convenient and to lower the thermal stress. Such dams are used in thermal power plants for the production of electricity.