There are various types of wells used for the extraction of groundwater for domestic, commercial and industrial applications, mentioned below are some types of wells.
Historically, dug wells were excavated by hand shovel below the water table but, modern large-diameter dug wells are dug by power equipment.
Driven wells are constructed by driving a small diameter pipe into shallow water-bearing sand or gravel. These wells are relatively simple and economical to construct, but they can tap only shallow water similar to dug wells.
Drilled wells are constructed by either percussion or rotary-drilling machines. They can be drilled more than 1,000 feet deep.
Industrial bore wells are drilled wells down to the confined aquifer.
The Central Environmental Authority (CEA) is established under the provisions of an act of the parliament of Sri Lanka. The CEA is granted with a wide set of regulatory powers under the National Environment Acts.
The Ministry of Environment and Natural Resources has the overall responsibility in the affairs of the CEA with the objective of integrating environmental considerations in the development process of the country.
For legal compliance of any building or facility, discharge of waste water in to the environment is required to be complied with the guidelines stipulated by the CEA.