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Lecture 9

GGRA lecture 9.docx

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University of Toronto Scarborough
Andre Sorensen

March 11, 2014 GGRA lecture 9 Urban ecosystem • Cities are seen as a complex system with their own metabolic processes • Have enormous inputs and well as outputs • Measuring those imputs and outputs and there are very direct policy information • Through policy we can do things where you can take outputs and have them linked with other process in order to eliminate waste entirely • policies issues are about how you manage those flows Urban metabolisms • Is a model that describes the flow and transformation f material and energy in cities • Describes the full set of the technical and socio economic processes that happen in cities including the production of energy and disposal of waste • Becoming much more complicated and we are shipping products around the world because that metabolism is happening elsewhere, i.e. waste disposal Political ecology perspective on water • Those power relationships effect the kind of processes in metabolic cities • New York has continually looked for fresh water resources in large areas such as northern state because they don’t have a a lot of water resources • Lots of land is bought and aquodites are build, this a infrastructure solution • New York determines what water can be used for • This results in a power relationship between new York and upstate • There is a need to maintain metabolic processes which results in decisions that effects everyone • With rapid urbanization comes a high demand for water • Growing conflicts over water March 11, 2014 • i.e. Israel has conflicts with its neighbours, in southern china there’s a rich source of water which contrasts to the north • the way political structure effects water control Water inputs and outputs: • by the early 20 c almost all cities in the industrializing world, municipal government was buying all control of water • there was a shift of privatization, this occurs in developing counties this happened because they didn’t have budget and the resources to create water system • people used to build pipes and dump sewage into bodies of water • pipes were filled with landfill • cristy pitz was a valley where there used to be landfill, it was an open sewer, a pipe was built and buildings were built on top • at first pipe were built to dump the water downstream, • primary treatment: filters were added to catch any plastic • secondary treatment: digesting of nutrients with bacteria • tertiary treatment: treatment of toxic waste Current water challenges: • there projects to try to improve and innovate sewage system • some of the big challenges are a result of technologies used to build sewage • there’s 2 kind of water: what’s coming out of houses and then there storm water from streets • some cities used to have sanitary sewers and storm water sewers o wo
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