Borehole Rehabilitation
Borehole rehabilitation is the process of restoring or improving the functionality and productivity of an existing borehole that has become less efficient or ineffective over time. Boreholes may deteriorate or become clogged due to factors such as mineral buildup, sediment accumulation, bacterial growth, changes in the underground aquifer or deterioration of borehole casing. Rehabilitation typically involves a series of steps, which may include:
Assessing the condition and performance of the borehole through inspections, visual and borehole camera surveys, water quality testing, and pumping tests. Identifying the causes of decreased performance.
Removing obstructions, debris, sediment, or mineral encrustations from the borehole to improve water flow. This can be done using methods like high-pressure jetting, airlifting, or mechanical brushing.
Applying chemicals or disinfectants to control bacterial growth, algae, or other contaminants that may affect water quality and productivity.
Agitating the surrounding aquifer by pumping high volumes of water to remove fine sand or silt particles and improve water supply.
Addressing any physical damage or issues with the borehole infrastructure, such as replacing or installing casing, screens, UPVC casing, or seals.
Installing or upgrading protective measures such as borehole caps, bentonite, or sanitary seals, to prevent contamination from surface runoff or foreign materials.
Rehabilitation aims to restore the borehole’s original capacity, improve water quality, and prolong its service life. It can help optimize water supply, ensure access to safe and reliable water, and extend the lifespan of the borehole infrastructure.
