Kali river contaminates groundwater in the adjacent villages, how to prevent river water polluting the wells?

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Industrial pollution in a river causing pollution to groundwater wells in hundreds of villages, its high time that water quality parameters needs to be simultaneously monitored in both river and groundwater? How can we make sure we have some safe buffer in the river banks to prevent this?

 

 

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4 Answers

  2. As with most ground sources water, wells are a sync for ground water from precipitation. If the ground water is removed faster than it can be replaced with surface infiltration, the seepage pressure form the rivers will fill the wells.  This is why coastal areas have salt water in the wells. That water is extracted below the river and ground water depth. Ponds and infiltration seeps built to collect run-off in the landscape will replenish the water faster.   I would think the wells need to be out of the flood plain and river basin area.

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  4. Dear Vidhya,

    it's clear that water quality must be monitored at both surface water bodies and groundwater wells. How to prevent groundwater contamination from surface contamination is the big question. The answer is, indeed, site dependent. It all depends on local geology. Normally, wells in Quaternary aquifers tap three main geological units: (1) a shallow aquifer, (2) a deep aquifer and (3) an aquitard in between them. Wells are in many cases drilled to tap only the shallow aquifer because it's cheaper (100-200 meters). Indeed, it's the shallow aquifer the one that interacts more with surface water and therefore, with potential pollutants. Instead, if wells are screened only at the deepest section, the impact of surface contamination is alleviated.

    Having said so, ideally the best solution is to eradicate pollution at the source. This can be achieved by implementing strong penalties to contaminating industry, etc.

    1 Comment

    1. Totally agree with you. Strong penalties to cut off the source of the pollutants along with a buffer zone set at the hyporheic zone so no wells are drilled there can be a start. Regular monitoring in addition is necessary to make sure it is not too lake and the plume has not migrated.