Social Complexity in 3D Lecture: http://youtu.be/eYe0QrFpQ6c
Earthcare in Raahe
Cleaning up the shorelines
Activists demonstrate selfless love for nature
Friends gather together
Exploring names through art and stories
Weaving natural experience throughout
Human population development
Human populations often grow near water sources. More recently, human populations have been developed in arid locations:
- Los Angeles
- Las Vegas
Water projects deliver water from remote locations to arid communities:
- Bureau of Reclemation
- Book: Cadillac Desert
Energy and material costs of moving water are significant. Water is sometimes pumped up slope, over hundreds of miles, and from many sources.
Competition and Conflict
Native populations and local residents have historically asserted rights to local water sources. Additionally, water quality can be contentious from downstream communities that feel quality has been degraded by upstream uses.
- Texas v. Oklahoma – Supreme Court ruled that Texas does not have right to Oklahoma water
- China – undertaking major projects to convey water from South to North China, large water projects (3 Gorges Dam)
- Owens Valley – local residents/farmers asserted right to water over Los Angeles
- United States v. Mexico – Colorado River water is significantly depleted before getting to Mexico
- Egypt and Ethiopia – Egypt has rights to water superseding water rights in Ethiopia
- Singapore and Malaysia – Singapore relied on water from Malaysia; focused on water re-use/reclamation (water treated to high level put back in water system), now “water independent”
Cooperation and agreements
Water treaties are created between countries/populations to make agreements about water usage and passage. This brings cooperation between people, nations, etc.
There are several significant steps in water treatment, including:
- Filtration – e.g. Biosand
- Coagulation & Flocculation
- Biological degradation – aeration, microbial digestion, etc. (if wastewater)
- Settling / Sedimentation
- Removal of excess nitrogen and phosphorous
- Discharge (if wastewater)
- Disinfection (if for drinking) – UV, chlorination, etc.