Recovery and restoration will take appreciably much longer than a "couple of weeks". William's comment is right on the money. Shutting down the constituent sources is a very good start. However, this is the point when everyone attached to this waterbody must put on their thinking caps; roll up their sleeves; and get their hands very dirty to restore a clean tributary. Strategy wise you may want to conduct a background assessment that traces back to the earliest known sources and types of pollution; estimates constituent concentrations; quantities, and quality of all pollution sources possible then project proportionate qualitative values of just what you're facing for a comprehensive restoration. Also; in my humble opinion; before undertaking disturbance to sediments and surrounding strata; you might consider pre-screening analyses for exactly what you will be handling. Best Management Practice (BMP) would be to start at or near the Ganga headwaters and remediate downstream; one section at a time until the exercise reaches the mouth of the tributary. This is just a preliminary thought for the task you are undertaking.

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Recovery and restoration will take appreciably much longer than a "couple of weeks". William's comment is right on the money. Shutting down the constituent sources is a very good start. However, this is the point when everyone attached to this waterbody must put on their thinking caps; roll up their sleeves; and get their hands very dirty to restore a clean tributary. Strategy wise you may want to conduct a background assessment that traces back to the earliest known sources and types of pollution; estimates constituent concentrations; quantities, and quality of all pollution sources possible then project proportionate qualitative values of just what you're facing for a comprehensive restoration. Also; in my humble opinion; before undertaking disturbance to sediments and surrounding strata; you might consider pre-screening analyses for exactly what you will be handling. Best Management Practice (BMP) would be to start at or near the Ganga headwaters and remediate downstream; one section at a time until the exercise reaches the mouth of the tributary. This is just a preliminary thought for the task you are undertaking.