Groundwater Quality Introduction and Overview - Jenny Webster-Brown

Groundwater Quality Introduction and Overview Jenny Webster-Brown

UNESCO 2000

Natural Resources Canada. http://geoscape.nrcan.gc.ca/h2o/okanagan

Well 1 Well 2 Unsaturated zone River Unconfined aquifer Confined aquifer

River Unconfined aquifer Confined aquifer

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

Emergence of water quality problems related to human activity 1850 1900 1910 1920 1930 1940 1950 1960 1970 1980 1990

Groundwater Quality Introduction and Overview - Jenny Webster-Brown

by aimeew on Aug 26, 2010

Accessibility

Tags

Upload Details

Usage Rights

1 Embed 74

Statistics

Groundwater Quality Introduction and Overview - Jenny Webster-Brown — Presentation Transcript