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Leachate Collection. Leachate is liquid generated from rainfall and the natural decomposition of waste that is filtered through the landfill to a leachate collection system. The leachate collection system's job is to direct the leachate to collection sumps so it can be properly removed from the landfill.The leachate collection system is designed with a minimum 2 percent slope to drain to collection sumps. A leachate collection sump consists of an HDPE riser and submersible pump.Leachate drains to the leachate collection system, where it is transferred to a central collection pump and piped to an onsite holding tank or it can be re-circulated in the areas underlain by Subtitle D liner system. leachate collection sump consists of an HDPE riser and submersible pump. Leachate drains to the leachate collection system, where it is transferred to a central collection pump and piped to an onsite holding tank or it can be re-circulated in the areas underlain by Subtitle D liner system.
In agriculture, leaching refers to the loss of water-soluble plant nutrients from the soil, due to rain and irrigation.Soil structure, crop planting, type and application rates of fertilizers, and other factors are taken into account to avoid excessive nutrient loss.eaching is an environmental concern when it contributes to groundwater contamination. As water from rain, flooding, or other sources seeps into the ground, it can dissolve chemicals and carry them into the underground water supply.