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TitleRegional hydrogeological mapping project of the St. Lawrence Lowlands of southwestern Quebec: hydrogeological characterization work 1999-2000
AuthorNastev, M; Savard, M M; Lefebvre, R; Martel, R; Fagnan, N; Bourque, E; Hamel, A; Karanta, G; Lemieux, J M
SourceGeological Survey of Canada, Current Research (Online) no. 2001-D9, 2001, 27 pages, (Open Access)
PublisherNatural Resources Canada
Mediapaper; on-line; digital; CD-ROM
RelatedThis publication is contained in Geological Survey of Canada; (2001). Current Research 2001, winter release, Geological Survey of Canada, Current Research no. 2001
File formatpdf
NTS31G/06; 31G/07; 31G/08; 31G/09; 31G/10; 31G/11; 31G/14; 31G/15; 31G/16; 31H/05; 31H/12; 31H/13
AreaArgenteuil; Dexu-Montagnes; Mirabel; Thérèse-de-Blainville; Montréal; Oka; Saint-Hermas; Lachute
Lat/Long WENS-75.5000 -73.5000 46.0000 45.2500
Subjectshydrogeology; piezometric levels; groundwater levels; groundwater regimes; groundwater movement; groundwater discharge; aquifers; hydraulic fracturing; fracture analyses; topography; tills; sands; clays; silts; aquifer tests; water quality; piezometric analyses; Quaternary; Paleozoic; Cretaceous
Illustrationssketch maps; schematic models; graphs; histograms; tables
Released2001 01 01
AbstractThe GSC is carrying out a regional hydrogeological mapping project of fractured rock aquifers in the St. Lawrence Lowlands of southwestern Quebec. The regional aquifer consists of Paleozoic fractured sedimentary rocks. This aquifer is mostly confined with clay and silt sediments at lower altitudes whereas over topographic heights it becomes a water-table aquifer. This paper presents the fieldwork and results of the hydrogeological characteriza- tion based on 361 constant-head injection tests, 4 large-scale pumping tests, 4 pulse tests, and 3 step pumping tests, as well as slug tests performed in 23 boreholes and 10 observation wells. The first results indicate that carbonate and sandstone rocks are the most exploitable regional aquifers in the region. The average transmissivity shows a weak decreasing trend with depth. When present, the deep sandy gravel layer overlying the top of frac- tured aquifers is believed to be the major conduit for groundwater flow.