Explain how the landfill might still have negative effects on the local watershed.

While modern landfills are designed to prevent the leakage of contaminants into the surrounding environment, there is still the potential for negative effects on the local watershed.

One potential issue is the leachate that is produced as waste decomposes. Leachate is a toxic liquid that can seep into the groundwater and surface water, contaminating the local watershed. If not properly managed, leachate can have harmful effects on the local aquatic ecosystem and potentially impact drinking water sources.

Additionally, landfills can also produce methane gas as organic waste decomposes. Methane is a potent greenhouse gas that contributes to climate change. If methane emissions are not properly captured and managed, they can contribute to air pollution and have negative effects on the local environment.

Overall, while landfills are designed to minimize their impact on the surrounding environment, there is still the potential for negative effects on the local watershed if proper precautions and management practices are not in place.