Impact of Aggregate Extraction Activities on Cold Water Discharge, Groundwater in a Watershed Context (PDF)
Regional-scale groundwater flow and thermal transport modelling was completed as one component of a multi-disciplinary subwatershed study for a portion of the Credit River, west of Toronto, Canada. Aggregate extraction activities in the area have the potential to alter the groundwater flow system. The concern regards the quantity and temperature of groundwater being discharged to streams and watertable drawdown, since present discharge conditions support a cold water fishery in the Credit River and change in watertable elevations can impact local wetlands. Groundwater modelling determined extraction activities can impact watertable elevations and quantity of groundwater discharging to streams but have limited impact on increasing the temperature of groundwater discharge.