Surface Water–Groundwater Connection at the Los Alamos Canyon Weir Site (original) (raw)
2005, Vadose Zone Journal
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Vadose Zone Journal, 2005
Following the May 2000 Cerro Grande fire at Los Alamos, NM, surface water control structures were constructed near Los Alamos to mitigate the transport of contaminant‐bearing sediment toward the Rio Grande river due to increased runoff caused by the removal of vegetation by the fire. A low‐head weir was constructed in Los Alamos Canyon, 5 km to the east of Los Alamos, to capture contaminant‐bearing sediments and to allow runoff to pass downstream without significant ponding behind the weir. During construction of the weir, channel alluvium was removed and the underlying fractured basalt was exposed. To monitor any downward transport of contaminants into fractured basalt, and potentially downward to the regional groundwater, three boreholes (one vertical, and two angled) were installed for environmental monitoring. An innovative monitoring system was installed using FLUTe (Santa Fe, NM) liners for both vadose zone and perched groundwater zones. The vertical borehole intersects severa...
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