Correct Answer - Option 4 : Jack well
Explanation:
Infiltration wells:
Infiltration wells are shallow wells constructed in series along the banks of a river, in order to collect the river water seeping through their bottoms.
These wells are generally constructed of brick masonry with open joints. The water percolates through these joints and gets collected in these wells.
The various infiltration wells are connected by porous pipes to a sump well-called jack well.
The water reaching the jack well from different infiltration wells is lifted, treated, and distributed to the consumers.
Open Wells or Dug Wells:
An open well usually refers to the most basic type of well, which is a cylindrical shaft dug into the ground using hand tools, with an opening that is not covered by a permanent cap.
The walls of an open well may be built of precast concrete rings or in brick or stone masonry.
Open wells are almost always water table wells, meaning they are made just deep enough to reach the water table, allowing groundwater to fill the bottom of the well.
The water is often coming from an aquifer or groundwater, and can be easily deepened, which may be necessary if the groundwater level drops, by telescoping the lining further down into the aquifer.
The yield of an existing open well most easily improved by deepening or introducing vertical tunnels.
∴ The dependable discharge of a lone circular open well is increased most easily by deepening the well.
