Leachate recirculation in bioreactor landfills can make waste break down faster, but it can also make the landfill slope less stable. A study used computer modeling to see how injecting leachate at different pressures and distances from the slope affects stability. They found that injecting leachate closer to the slope and at higher pressure can make the slope less stable. Injecting leachate further from the slope and at lower pressure can make the landfill more stable. This information can help design bioreactor landfills that are safer and more stable.