What type of topography is ideal for the trench method in a sanitary landfill?

The trench method in a sanitary landfill is best implemented in flat or moderately sloping terrain. This type of topography allows for easier excavation and construction of the trench, which is crucial for containing waste and managing leachate – the liquid that drains or 'leaches' from a landfill. Flat or gently sloping areas facilitate efficient drainage and reduce the risk of water pooling, which can lead to contamination of surrounding land and groundwater systems.

Additionally, using this method in appropriate topography helps to minimize the environmental impact, as it allows for better control of waste management processes, including air space efficiency and leachate management. The construction of trenches can be more stable and manageable in these terrains, ensuring that waste is properly buried and the site can be maintained more effectively over time. This also aligns with best practices in landfill design and operations to ensure safety and environmental protection.