Landfill design is a specialized skill that involves managing and disposing of waste in a safe, eco-friendly manner. It requires knowledge of geotechnical engineering, environmental science, and regulatory compliance. Local laws and regulations must be followed to ensure the landfill is designed to handle the specific waste stream and protect against environmental hazards like contamination of water sources. Design includes planning and construction of the landfill cell, which includes lining systems to prevent leakage and gas capture systems to collect methane gas produced by decomposing waste. Proper landfill design ensures that waste is safely contained and does not pose a threat to public health and the environment.