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TitleHydrogeologic analysis of the 'Yonge Street' aquifer, south-central Ontario: a multi-decadal pumping test
AuthorGerber, R E; Holysh, S; Fairbanks, M; Bradley, T; Sharpe, D; Russell, H A JORCID logo
SourceProceedings, GeoOttawa 2017; by International Association of Hydrogeologists; 2017 p. 1-8
LinksGeo Ottawa 2017
Alt SeriesNatural Resources Canada, Contribution Series 20170223
PublisherCanadian Geotechnical Society
MeetingGeo Ottawa 2017 - 70th Canadian Geotechnical Conference and the 12th Joint CGS/IAH-CNC Groundwater Conference; Ottawa; CA; October 1-4, 2017
NTS30M/13; 30M/14; 30M/15; 30M/16; 31D
AreaYonge Street; Greater Toronto Area
Lat/Long WENS -80.0000 -78.0000 45.0000 43.7500
Subjectshydrogeology; surficial geology/geomorphology; aquifers; sands; glaciolacustrine deposits; groundwater; gravels; Scarborough Formation; Sunnybrook Formation; Thorncliffe Formation; Newmarket Till; Oak Ridges Moraine; Yonge Street Aquifer (YSA)
Illustrationslocation maps; graphs; schematic diagrams; digital elevation models; 3-D models
ProgramGroundwater Geoscience, Aquifer Assessment & support to mapping
AbstractThe Yonge Street Aquifer (YSA) in the Greater Toronto Area is a prolific municipal supply aquifer that has been utilized since the mid-1900s. The aquifer occurs as a roughly north-south channelized sand and gravel feature at depths greater than 70 m, extending for a length exceeding 20 km and a width of at least 2km. The current municipal water supply system consists of nine wellfields installed between 1957 and 1991.
Based on high-quality seismic profile and continuously cored borehole data, a regional stratigraphy has been delineated consisting of the following major units: bedrock, Lower Sediments (Scarborough, Sunnybrook and Thorncliffe Formations), Newmarket Till, Oak Ridges Moraine and overlying surficial diamict/glaciolacustrine sediments. The YSA occurs within a Thorncliffe age channel. This paper focusses on an analysis of the groundwater level response to municipal groundwater pumping that confirms connection along the channel. Analyses suggest that the YSA is a semiconfined (leaky) strip aquifer with observed transmissivities between 1500 to 4500 m2/d, in contrast to regional aquifer transmissivities that are less than 500 m2/d. It is anticipated that this conceptual model can inform groundwater
exploration and development for aquifers that exist within similar glaciated terrains.

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