Civil Engineering - Water Supply Engineering - Discussion

A. Clay.

When a well is sunk, the quality and quantity of water it yields depend on the type of soil or rock formations the well penetrates. A well is considered good if it penetrates a permeable layer of soil or rock that is capable of transmitting water to the well at a sufficient rate.

In the case of clay, it is fine-grained soil that has low permeability and porosity. However, if the clay layer is underlain by a permeable layer, such as sand or gravel, it can act as an aquitard or confining layer that prevents water from moving downward into deeper aquifers. This can cause water to accumulate and form a water table above the clay layer, which can then be accessed by wells.

Therefore, a well sunk into clay can be good if the clay layer is underlain by a permeable layer that contains water. However, if the clay layer is continuous and impermeable, the well may not yield enough water to be considered good.

If coarse gravel is there then the water retention will be more!

The yield will be more if coarse gravel is there.

Coarse gravel provides good base for well.

Why? Explain the answer.

Why? Explain the answer.