In this article we will discuss about the construction of infiltration well with the help of a suitable diagram.
Infiltration wells are shallow wells constructed under the beds or rivers and nallas. These wells are very suitable for Indian conditions where there are deposits of sand and porous material at least 3 m deep in river beds. In the sandy beds of rivers much quantity of water percolates down. As the water passes through sand which acts as filter, it’s all suspended organic and inorganic impurities are removed.
Therefore, the quality of such water is better than river water. Infiltration wells and infiltration galleries are based on the same principle. Large number of wells are constructed in the river bed and they are connected to an inspection well. The water flows under gravity from these wells to the inspection well and then towards jack-well from where it is pumped. Figure 4.22 (a) shows the sectional elevation of a set of three such wells.
In order to obtain large quantity of water, infiltration wells are sunk in series in the bank of river. The wells are closed at top and open at bottom. They are constructed of brick masonry with open joints. These are generally covered at top and Kept open at bottom as shown in Fig 4.22 (b).
The various infiltration wells are connected by porous pipes to a sump well called jack well. The water reacting the jack well from different infiltration wells is lifted, treated and distributed to the consumers.