EESA06H3 Lecture Notes - Lecture 10: Sodium Chloride, Water Cycle, Urban Runoff
10 May 2018
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Department
Course
Professor
Too Much, Too Quickly
- Artificial landscapes alter natural hydrological cycle
- Hardened urban watersheds can no longer absorb rain for groundwater
- Water quantity and water quality are issues
- Water from streets, industrial sites, parks and residential lawns contain chemical
contaminants
- Chemical contaminants high in ‘first flash’ when rains after long dry spell
- Automobiles and road salt used in winter are major sources of urban contaminants
- Roads, parking lots, direct deposition of combustion products, etc.
- Urban run-off contaminates Lake Ontario
- Landfilling reduces wetland areas in southern Ontario
- Wetlands are natural filters
- Improve water quality by process nutrients and contaminants
- Provide life support for animals and plants
- Create open space for recreation
- Urbanization causes poor quality storm water entering wetlands, furthering erosion
Document Summary
Hardened urban watersheds can no longer absorb rain for groundwater. Water quantity and water quality are issues. Water from streets, industrial sites, parks and residential lawns contain chemical contaminants. Chemical contaminants high in first flash" when rains after long dry spell. Automobiles and road salt used in winter are major sources of urban contaminants. Roads, parking lots, direct deposition of combustion products, etc. Landfilling reduces wetland areas in southern ontario. Provide life support for animals and plants. Urbanization causes poor quality storm water entering wetlands, furthering erosion.
