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TitleAn overview of the Ontario Geological Survey's groundwater initiative
DownloadDownload (whole publication)
LicencePlease note the adoption of the Open Government Licence - Canada supersedes any previous licences.
AuthorPriebe, E H; Bajc, A F; Brunton, F R; Burt, A K; Dell, K M; Hamilton, S M; Mulligan, R P M
SourceRegional-scale groundwater geoscience in southern Ontario: an Ontario Geological Survey, Geological Survey of Canada, and Conservation Ontario open house; by Russell, H A JORCID logo; Ford, D; Priebe, E H; Geological Survey of Canada, Open File 8212, 2017 p. 28, Open Access logo Open Access
PublisherNatural Resources Canada
MeetingOntario Geological Survey and Geological Survey of Canada groundwater geoscience open house; Guelph; CA; March 1-2, 2017
Documentopen file
Mediaon-line; digital
RelatedThis publication is contained in Regional-scale groundwater geoscience in southern Ontario: an Ontario Geological Survey, Geological Survey of Canada, and Conservation Ontario open house
File formatpdf
NTS30; 31C; 31D; 40; 41A; 41G; 41H/03; 41H/04; 41H/05; 41H/06; 41H/12; 41H/13
AreaSimcoe County; Southern Ontario; Niagara Escarpment; Greater Golden Horseshoe; Waterloo; Barrie; Oro; Brantford; Woodstock; Orangeville; Fergus; Niagara; Sudbury; Manitoulin Island
Lat/Long WENS -84.0000 -76.0000 46.0000 41.5000
Subjectshydrogeology; regional geology; surficial geology/geomorphology; geochemistry; geophysics; environmental geology; groundwater; groundwater resources; aquifers; groundwater resources; resource management; hydrostratigraphic units; groundwater geochemistry; groundwater flow; groundwater regimes; modelling; basin analysis; geophysical surveys; core samples; water quality; Phanerozoic; Cenozoic; Quaternary; Paleozoic
ProgramGroundwater Geoscience Aquifer Assessment & support to mapping
Released2017 02 22
AbstractThe Ontario Geological Survey (OGS) initiated mapping activities in support of regional hydrogeological characterization in 2001. Concurrent activities included the generation of updated fully-attributed, bedrock geology, karst, physiography, surficial geology, drift thickness and bedrock topography seamless maps. These pan-southern Ontario maps and products serve as a foundation for hydrogeological investigations, and in particular, they have formed an integral part of the watershed characterization portion of the source protection plans. Following the release of these pan-southern Ontario products, the OGS shifted focus to characterizing the subsurface through the development and implementation of three sub-surface mapping activities; 3D Paleozoic bedrock mapping, 3D surficial sediment mapping and ambient groundwater geochemistry mapping. Each of these activities is described below.
1) The primary goal of the 3D Paleozoic bedrock mapping is to delineate the stratigraphic units that host important groundwater resources in southern Ontario. This is done by identifying the main geologic controls on groundwater flow and mapping and delineating regional-scale groundwater flow systems within the context of a sequence stratigraphic framework. The first study area concentrated on the Niagara Escarpment because this region is undergoing significant population pressures and relies heavily on deep bedrock groundwater resources. The next regional-scale 3D Paleozoic bedrock mapping project will focus on Upper Silurian through Middle Devonian carbonate-dominated units located to the southwest.
2) The goals of 3D sediment mapping projects are to reconstruct the Quaternary history of each area, build a regional-scale 3D model of Quaternary deposits that form aquifers and aquitards, and to define the internal characteristics of each sediment package. The initial focus was on areas either within or adjacent to the Greater Golden Horseshoe and to date, projects have been completed in the Waterloo (GRS03), Barrie-Oro (GRS11), Brantford-Woodstock (GRS10) and Orangeville-Fergus (GRS15) areas, South Simcoe is nearing completion and projects in the Niagara and Central Simcoe areas are well underway. The 3D sediment mapping program has taken a basin analysis approach similar to that used by the GSC in the Oak Ridges Moraine. Ground and airborne geophysical surveys coupled with continuous-coring have enabled the development of conceptual geologic models, critical for the successful construction of 3D geologic models.
3) The ambient groundwater geochemistry project which was initiated in 2011 and resulted in the collection of untreated bedrock- and overburden-derived groundwaters at approximately 1850 stations across all of southern Ontario. The main purpose of the study is to understand and predict the effect that aquifer composition has on groundwater quality as well as to understand the flow history, residence time and vulnerability of individual and regional groundwater sources. The sampling density is approximately 1 station per 10 square kilometers. Digital datasets and maps were released for all of southern Ontario in 2015 (MRD283-REV). Moving beyond southern Ontario, a similar study was initiated in the Sudbury region in 2016, with plans to conduct mapping activities on Manitoulin Island in 2017.
Summary(Plain Language Summary, not published)
Proceedings for Regional-Scale Groundwater Geoscience in Southern Ontario open house organized by the Ontario Geological Survey, Geological Survey of Canada and Conservation Ontario Geoscientists. Open house is on 2017-03-01 and 02. Purpose is public engagement and dissemination of geoscience completed in Southern Ontario during the past year.

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