Gravity driven dewatering systems for landfill expansion

摘要

A landfill site near the east coast of the United States in North Carolina has utilized a permanent gravity driven ground water dewatering system to construct lower liner grades, decrease a soil deficit at the site and increase landfill capacity. A variety of methods based on published data and field investigations were used to determine the design and impact of the dewatering system for the site. The design of such systems is highly dependant on the hydraulic conductivity of the aquifer and should be scrutinized based on the extent and impact of the proposed dewatering system. The final design of the dewatering system should include a judgement of the collective aquifer testing results to adequately size the system and to evaluate the schedule of implementation based on the time required for full drawdown.