The researchers studied the water quality in Kolleru Lake, a large freshwater lake in Asia. They collected water samples from different locations in the lake before and after the monsoon seasons. They analyzed 11 water quality parameters like pH, temperature, and dissolved oxygen. The results showed that the water quality in Kolleru Lake is not good, but it improved slightly after the monsoon. They used GIS software to create maps showing the distribution of water quality parameters in the lake. The maps help understand how the water quality changes across the lake and can be used to protect the lake's ecosystem.