Topic 3: Dug Well

Description

Dug wells are one of the oldest forms of groundwater abstraction and consist of large-diameter vertical excavations that reach the groundwater table. Unlike drilled wells, they are typically constructed using manual excavation or simple mechanical methods, resulting in a wide shaft that is often lined with masonry, concrete rings, or similar structural materials to prevent collapse.

Due to their simple construction method, dug wells are generally limited to shallow groundwater zones. They are highly dependent on local hydrogeological conditions and are most effective where the groundwater table is relatively high and stable throughout the year.

Function

Water enters a dug well through both the bottom and the permeable or partially permeable sidewalls. Once groundwater seeps into the excavation, it collects in the shaft and is extracted using buckets, hand pumps, or simple mechanical pumping systems.

Because the intake surface is relatively large but shallow, dug wells rely heavily on the natural recharge of the surrounding soil and aquifer. The inflow is usually slow and governed by the permeability of the upper soil layers. As a result, water availability can fluctuate significantly depending on seasonal groundwater level changes and precipitation patterns.

Advantages

  • simple construction method with minimal technical requirements
  • low initial investment costs compared to drilled wells
  • easy access for inspection, cleaning, and basic maintenance
  • suitable for shallow groundwater conditions with high water table
  • can be constructed with locally available materials and labor
  • does not require advanced drilling equipment or specialized expertise
  • practical solution for low-demand or decentralized water supply systems

Disadvantages

  • limited usable depth, restricting application to shallow aquifers only
  • higher risk of contamination from surface runoff and surrounding soil
  • relatively low to medium yield compared to drilled or engineered wells
  • strong sensitivity to seasonal groundwater fluctuations
  • structural stability issues over time if not properly reinforced
  • higher vulnerability to microbial contamination without proper protection measures

Typical Applications

  • small-scale water supply systems with limited demand
  • rural and remote areas without access to advanced drilling technology
  • individual household water supply or community-level solutions
  • emergency or temporary water supply situations
  • regions with shallow groundwater tables and favourable soil conditions