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1988

Scott, J. D., Zinter, G., Pauls, D. R., Dusseault, M. B.

This is one of a series of reports that presents the findings of the Plains Hydrology and Reclamation Project (PHRP), an interdisciplinary study that focuses primarily on hydrologic aspects of reclamation of surface coal mines in the plains of Alberta. This research has been conducted by the

also in the surrounding area. This report focuses on PHRP Sub-objective A5, which is concerned with subsidence behaviour in reclaimed mine spoil. Differential subsidence of reclaimed surfaces has been demonstrated to create water—holding depressions that disrupt farming operations and to cause

pavement distress in roads crossing reclaimed areas. Subsidence depressions have the potential to delay granting of reclamation certification in the Plains region of Alberta. As part of our study of this phenomenon, we have reviewed the available engineering literature relative to subsidence of reclaimed

1990

Pigot, M. E., Macyk, T. M., Moran, S. R., Trudell, M. R.

pond was perched above the water table. This pond was instrumented in September 1987 to monitor the subsurface water and salinity regime. Observations that continued throughout 1988 and 1989 provide the basis of this report. The closed basin responsible for the existence of pond S195 was formed by

produced a hydraulic barrier with sufficiently high density and low hydraulic conductivity that rapid downward drainage of the ponded water was prevented. The hydraulic conductivity was further reduced by sealing of the upper surface of the spoil as a result of structural collapse of sodic clay in