The article discusses various techniques for restoring and managing lakes and reservoirs to improve water quality. These techniques include controlling algal biomass, using advanced wastewater treatment, protecting from pollution, and managing plant communities. The researchers found that methods such as hypolimnetic withdrawal, phosphorus inactivation, and biomanipulation can help improve the health of lakes and reservoirs. Additionally, strategies like using chemicals, biological controls, and sediment removal can also be effective in maintaining water quality.