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Surface Runoff at an Instrumented Catchment Scale Water Balance Final Cover
Design of earthen final covers often relies on water balance models. Among the water balance parameters, percolation is often the smallest component. An accurate prediction of percolation is predicated upon relatively accurate estimation of other typically greater magnitude water balance parameters, such as surface runoff and evapotranspiration (ET). The objective of this study was to measure surface runoff at an instrumented landfill cover at the catchment scale. Two test sections of an existing earthen final cover were instrumented at a landfill located in Austin, Texas. The upper and lower catchments were 0.9 acres and 1.6 acres, respectively. The instrumentation installed within the soil cover consisted of water content and water potential sensors. Runoff from each catchment was collected in separate 3,000 and 5,000 gallon capacity tanks equipped with water-level sensors and actuator-controlled emptying. The peak runoff per event was 72% and 54% of precipitation for the upper and lower catchments, respectively, and it occurred in early spring 2012. The overall cumulative runoff during the 15-month study was 11% and 8% of precipitation for the upper and lower catchments, respectively. The average cumulative runoff peaked at 22.5% and 17% of precipitation for the upper and lower catchments, respectively, during early spring 2012 due to scant plant foliage and relatively high soil water contents.
Surface Runoff at an Instrumented Catchment Scale Water Balance Final Cover
Design of earthen final covers often relies on water balance models. Among the water balance parameters, percolation is often the smallest component. An accurate prediction of percolation is predicated upon relatively accurate estimation of other typically greater magnitude water balance parameters, such as surface runoff and evapotranspiration (ET). The objective of this study was to measure surface runoff at an instrumented landfill cover at the catchment scale. Two test sections of an existing earthen final cover were instrumented at a landfill located in Austin, Texas. The upper and lower catchments were 0.9 acres and 1.6 acres, respectively. The instrumentation installed within the soil cover consisted of water content and water potential sensors. Runoff from each catchment was collected in separate 3,000 and 5,000 gallon capacity tanks equipped with water-level sensors and actuator-controlled emptying. The peak runoff per event was 72% and 54% of precipitation for the upper and lower catchments, respectively, and it occurred in early spring 2012. The overall cumulative runoff during the 15-month study was 11% and 8% of precipitation for the upper and lower catchments, respectively. The average cumulative runoff peaked at 22.5% and 17% of precipitation for the upper and lower catchments, respectively, during early spring 2012 due to scant plant foliage and relatively high soil water contents.
Surface Runoff at an Instrumented Catchment Scale Water Balance Final Cover
Kaushik, Tryambak (author) / Khire, Milind V. (author) / Johnson, Terry (author) / Caldwell, Michael (author)
Geo-Congress 2014 ; 2014 ; Atlanta, Georgia
Geo-Congress 2014 Technical Papers ; 4125-4135
2014-02-24
Conference paper
Electronic Resource
English
Surface Runoff at an Instrumented Catchment Scale Water Balance Final Cover
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