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The Critical Role of Lateral Drainage Capacity in Limiting Leakage through a Low Permeability Geomembrane Cover
Waste storage facilities located near Sydney, Nova Scotia, Canada, were reclaimed with engineered cover systems. Similar alternative cover systems were utilized, each comprised of a geomembrane and overlying growth medium layer; however, a drainage layer above the geomembrane was not included in all instances. The monitored field performance of the alternate cover systems highlighted the detrimental impact that ponding of water above the geomembrane will have on performance. Empirical relationships for leakage through the geomembrane as a function of ponding pressure heads highlights that the performance of a low permeable layer is enhanced if adequate lateral drainage capacity is provided to eliminate sustained periods of water ponding. The field performance of the Hamburg-Georgswerder Landfill in Germany and the Monterey Peninsula Landfill in the United States are re-evaluated based on this finding. These case studies support the finding that the inclusion of a drainage layer mitigates risk associated with leakage attributed to geomembrane defects. However, the relative value of including lateral drainage capacity is also a function of site specific climatic conditions. Of particular importance in this regard is the intrannual and interannual variability in precipitation relative to evapotranspiration which will control the transient nature of the ponded conditions.
The Critical Role of Lateral Drainage Capacity in Limiting Leakage through a Low Permeability Geomembrane Cover
Waste storage facilities located near Sydney, Nova Scotia, Canada, were reclaimed with engineered cover systems. Similar alternative cover systems were utilized, each comprised of a geomembrane and overlying growth medium layer; however, a drainage layer above the geomembrane was not included in all instances. The monitored field performance of the alternate cover systems highlighted the detrimental impact that ponding of water above the geomembrane will have on performance. Empirical relationships for leakage through the geomembrane as a function of ponding pressure heads highlights that the performance of a low permeable layer is enhanced if adequate lateral drainage capacity is provided to eliminate sustained periods of water ponding. The field performance of the Hamburg-Georgswerder Landfill in Germany and the Monterey Peninsula Landfill in the United States are re-evaluated based on this finding. These case studies support the finding that the inclusion of a drainage layer mitigates risk associated with leakage attributed to geomembrane defects. However, the relative value of including lateral drainage capacity is also a function of site specific climatic conditions. Of particular importance in this regard is the intrannual and interannual variability in precipitation relative to evapotranspiration which will control the transient nature of the ponded conditions.
The Critical Role of Lateral Drainage Capacity in Limiting Leakage through a Low Permeability Geomembrane Cover
Meiers, Greg (author) / Bradley, Cody (author)
Geotechnical Frontiers 2017 ; 2017 ; Orlando, Florida
Geotechnical Frontiers 2017 ; 127-138
2017-03-30
Conference paper
Electronic Resource
English
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