DAMS

1) 

a. Building Large Dams
ADVANTAGES: 
- water supply
- more cultivated areas
- more farmland reclaimed from deserts
- no flooding risk
- provides electricity

DISADVANTAGES: 
- people are forced to move
- ecosystems and habitats are destroyed
- low quality lands
- more pollutants
- less water life
- more risk of earthquake

4) 

"El Chocon" dam in Argentina
LOCATION:
This dam is found in the Argentinian Patagonia, formed by the rivers of  Neuquen and Rio Negro.  

REASONS FOR BUILDING IT: 
Both the rivers Limay and Neuquen's waters were increasing so this was a problem for the population of "Alto Valle" and "Valle Medio", since there was a big flooring in 1899 that destroyed Viedma and Carmen de Patagones. 
In 1950 the "Agua y Energia Electrica" company, started developing the project, but they couldnt achieve it since there were very high prices. 
In 1967 the "Hidronor" company was able to start constructing this dam. 

PROBLEMS and LOCAL ISSUES: 
- the servicies werent enough in order to satisfy the demand. 
- School enrollment
- Sewer
- Gas 
- Potable water