River Rejuvenation: Reviving Rivers, Renewing Earth. 
River rejuvenation is the process of reviving the natural flow of the river that has been damaged due to human activities such as waste dumping, encroachment, and pollution. The process involves removing pollutants, cleaning up riverbeds, and restoring the natural environment around the river
Impacts:
-restores biodiversity
-Boosts tourism
-improves the livelihood
-Controls flood and reduces the damage caused

A few Examples from the World:

 The Rhine Action Programme“ was introduced by the ICPR in 1987 as a comprehensive restoration program. A year earlier, the Rhine had been poisoned by a catastrophic chemical spill, killing fish and small animals over a distance of more than 400 km from Basel to Koblenz and severely polluting the Rhine water as far as the Netherlands. In 2000, the "Rhine Action Programme" came to an end. Post program it has transformed it into a vibrant and thriving ecosystem.

Danube4all Programme -The overall goal of DANUBE4all (a 5-year Innovation Action funded by the EU) is the development of a comprehensive Restoration Action Plan for the Danube River basin developed in an unprecedented co-creation process with stakeholders, integrating citizens' interests to support the EU Mission "Restore our ocean and waters by 2030".

 Namami Gange Programme is an Integrated Conservation Mission, approved as a ‘Flagship Programme’ by the Union Government in June 2014 with a budget outlay of Rs.20,000 Crore to accomplish the twin objectives of effective abatement of pollution, conservation, and rejuvenation of National River Ganga.