An assessment of groundwater use in thirteen counties in southern Ontario / by S. Schellenberg & A.R. Piggott.: En13-5/98-148E-PDF

"An assessment of groundwater use within and surrounding the Grand River watershed is being carried out as part of a study of the potential impacts of climate change and variability on the groundwater resources of the region. Groundwater use, measured in terms of total annual water withdrawal, is estimated for each of the 171 census subdivisions which form the 13 counties within the study area. The average rate of groundwater use tor the area is 22.4 mm/yr with local rates as high as 586 mm/yr. Non-municipal groundwater use associated with water taking permits accounts for 70 percent of the total use. The highest rates of groundwater use are significant relative to recharge and therefore groundwater withdrawals should be represented in climate change impacts analyses. Groundwater supply limitations resulting from inadequate well yield and poor water quality are also estimated and are related to the geology of the region"--Abstract.

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