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TitleAssessment of nearshore groundwater discharge to Lake Simcoe, Ontario and identification of regional hydrogeological controls
DownloadDownload (whole publication)
LicencePlease note the adoption of the Open Government Licence - Canada supersedes any previous licences.
AuthorWallace, H; Robinson, C E
SourceSouthern Ontario groundwater project 2014-2019: summary report; by Russell, H A JORCID logo (ed.); Kjarsgaard, B AORCID logo (ed.); Geological Survey of Canada, Open File 8536, 2020 p. 191-201, Open Access logo Open Access
PublisherNatural Resources Canada
Documentopen file
Mediaon-line; digital
RelatedThis publication is contained in Southern Ontario groundwater project 2014-2019: summary report
File formatpdf
NTS31D/03; 31D/04; 31D/05; 31D/06; 31D/11; 31D/12
AreaLake Simcoe
Lat/Long WENS -79.8333 -79.1667 44.6303 44.1647
Subjectshydrogeology; surficial geology/geomorphology; Nature and Environment; Science and Technology; groundwater; groundwater resources; aquifers; groundwater regimes; groundwater flow; groundwater discharge; discharge rates; groundwater pollution; surface waters; lakes; glacial lakes; nearshore environment; shorelines; modelling; sediments; channel deposits; clays; gravels; organic deposits; sands; silts; glacial deposits; moraines; radioisotopes; radon; permeability; Oro Moraine; Oak Ridges Moraine; groundwater-surface water interaction; isotope tracers; lacustrine sediments; diamicton; made ground (fill); anthropogenic deposits; tunnel channel deposits; groundwater recharge; Phanerozoic; Cenozoic; Quaternary; Paleozoic; Silurian
Illustrationslocation maps; geoscientific sketch maps; plots; tables
ProgramGroundwater Geoscience, Aquifer Assessment & support to mapping
Released2020 05 28
AbstractGroundwater discharge may be an important pathway for delivering pollutants to large lakes, but this pathway is not well understood. The objective of this study was to quantify the spatial variability and volume of direct nearshore groundwater discharge to Lake Simcoe, Ontario, and evaluate linkages between the observed spatial distribution of groundwater discharge and regional hydrogeological features. Direct nearshore groundwater discharge was quantified using the naturally occurring radon isotope tracer, 222Rn. Boat surveys were conducted along 80% of the Lake Simcoe shoreline using portable radon detection equipment. Shoreline areas with high direct groundwater discharge were identified and the total direct nearshore groundwater discharge to Lake Simcoe was estimated to be 11.3 ± 2% of the total tributary inputs. Shoreline areas with high groundwater discharge were related to the presence of permeable nearshore surficial sediments and tunnel channel deposits. These features are thought to provide connectivity between the regional aquifer system and the lake. The study findings can be broadly applied in other studies evaluating direct groundwater inputs into large lakes of glacial origin.
Summary(Plain Language Summary, not published)
Collection of papers on work completed in the past five years as part of the southern Ontario Groundwater Project. This edited volume is a collection of currently unreported work.

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