CSU Hayward Dept. Geography and Environmental Studies GEOG 4350 Fall 2001 Class 9. Environment versus people - dams and development versus free-flowing rivers and nature. Colorado River case study. . Large dams-resource benefits.
Environment versus people - dams and development versus free-flowing rivers and nature.
Colorado River case study.
The excitor sends an electric current to the rotor, a large electromagnet, charging it with a magnetic field. The rotor spins inside the stator, a tightly wound coil of wire. The moving magnetic field causes an electric current to move through the stator. This current, at 10-20,000 volts, leaves the generator and is then carried to the transformers where it is 'stepped up' to 230,000 volts for transmission. The rotor is propelled by a shaft connected to turbines. Water falling through penstocks connected to the reservoir supplies the energy to spin the turbines.HEP Power Principles
Lake Chabot would flood the homes of around 60,000 people, two freeways and parts of Oakland airport – in minutes!(see Kramer 2001 thesis or Kramer & Lee 2001 articles)Are we safe in our own back yard?
June 5, 1976: the failure in the Teton Dam led to flooding in the cities of Sugar City and Reburg in Idaho. The dam failure killed 14 people and caused over $1 billion in property damages. Water was seen flowing down the downstream face of the dam, an earthfill embankment dam 300 ft. high, early on the day of the failure. Just a few hours later a crack in the dam had grown to a large hole, which soon led to the breach of the dam.