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Lecture

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3 Pages
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Department
Geography
Course Code
GGRA03H3
Professor
Andre Sorensen

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Urban, ecosystems, pollution
Urban ecosystem analysis
Cities as complex ecosystem
- Complex organisms with metabolic processes
- Huge inputs and outputs, structured by metabolic processes of production, delivery,
consumption
- Input & output can be measured and where necessary can be influenced by public
policy
Critical to understand nature of inputs and outputs
Cutting down outputs, such as recycling, is important
Water inputs & outputs
Huge urban input
Ensuring quality water supply is important to health
Polluted water is huge urban output
Successful 19th to 20th century water treatment policies, public water supply
Primary waste treatment, secondary , and tertiary treatment systems were installed
to prevent people from down the stream of the big cities getting sick
Current water challenges
Arise from the way we built our sewage system
Combined sanitary and storm water sewer systems used on pipes in cities, which in
reality needs to be treated in different ways
Works in dry weather, but heavy rain overloaded the systems, and water was
released into lake, river
The reason is because it caused too much to build two sewage systems
Cities are rebuilding systems to separate them
Storage for storm water surges
Point sources and non-point sources
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Description
Urban, ecosystems, pollution Urban ecosystem analysis Cities as complex ecosystem - Complex organisms with metabolic processes - Huge inputs and outputs, structured by metabolic processes of production, delivery, consumption - Input & output can be measured and where necessary can be influenced by public policy Critical to understand nature of inputs and outputs Cutting down outputs, such as recycling, is important Water inputs & outputs Huge urban input Ensuring quality water supply is important to health Polluted water is huge urban output th th Successful 19 to 20 century water treatment policies, public water supply Primary
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