Constructed wetlands are engineered systems designed to mimic the natural processes of wetlands. They use vegetation, soil, and microbial activity to treat wastewater by filtering out pollutants and improving water quality. These systems can be used for various applications, including stormwater management and sewage treatment. The design of constructed wetlands can vary, but they typically consist of shallow basins filled with gravel and planted with wetland plants. The plants help absorb nutrients and provide habitat for microorganisms that break down contaminants. Constructed wetlands are an effective and sustainable solution for managing water resources and protecting ecosystems.