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TitleDRASTIC-Fm: A modified vulnerability mapping method for structurally controlled aquifers in the southern Gulf Islands, British Columbia, Canada
AuthorDenny, S C; Allen, D M; Journeay, J M; MacKie, D C
SourceHydrogeology Journal vol. 15, 2007 p. 483-493,
Alt SeriesEarth Sciences Sector, Contribution Series 2005351
Mediapaper; on-line; digital
File formatpdf
ProvinceBritish Columbia
NTS92B; 92G
AreaGulf Islands
Lat/Long WENS-125.0000 -123.0000 49.5000 49.0000
Subjectsaquifer tests; aquifers; bedrock aquifers; faults; mapping techniques; DRASTIC
Illustrationslocation maps; stratigraphic charts; geological sketch maps; tables; diagrams
AbstractDRASTIC, the methodology for mapping the intrinsic vulnerability of aquifers, is modified to incorporate the structural characteristics of fractured bedrock aquifers. In these aquifers, groundwater flow is predominantly through fractures, with large-scale fracture zones
and faults acting as primary conduits for flow at the regional scale. The methodology is applied to the southern Gulf Islands region of southwestern British Columbia, Canada. Bedrock geology maps, soil maps, structural measurements, mapped lineaments, water-well information and topographic data, assembled within a comprehensive GIS database, form the basis for assigning traditional DRASTIC indices, while adding the structural indices necessary for capturing the importance of regional structural elements in recharge and well capture zone determinations.