Groundwater Quality Introduction and Overview - Jenny Webster-Brown

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Jenny Webster-Brown
Director
Waterways Centre for Freshwater Management

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Groundwater Quality Introduction and Overview - Jenny Webster-Brown

  1. 1. Groundwater Quality Introduction and Overview Jenny Webster-Brown
  2. 2. UNESCO 2000
  3. 3. Natural Resources Canada. http://geoscape.nrcan.gc.ca/h2o/okanagan
  4. 4. Well 1 Well 2 Unsaturated zone River Unconfined aquifer Confined aquifer
  5. 5. River Unconfined aquifer Confined aquifer
  6. 6. Groundwater Quality Function of: • Host rock composition (high water:rock ratio) • Depth and age • Composition of recharge & infiltration from unsaturated zone1 • “Mobility” of particular chemicals2 1. Problem contaminants include: – Soluble ions and metals (e.g., nitrate, boron, zinc and arsenic in absence of 2. Depends on ability to adsorb onto oxygen) mineral surfaces, which retards access to, and movement in, groundwater – Microorganisms from sewage Contaminants with more limited mobility – Soluble organic substances include: – lead – phosphate – arsenic in presence of oxygen
  7. 7. Emergence of water quality problems related to human activity 1850 1900 1910 1920 1930 1940 1950 1960 1970 1980 1990

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