kimerajamm
Joined: 28 Nov 2010
Posts: 785
|
 Posted: Tue Mar 01, 2011 4:33 pm Post subject: Today the main |
 |
|
In 1948 floods swept through the Columbia watershed, destroying Vanport, then the second largest city in Oregon, and impacting cities as far north as Trail, British Columbia.[108] The flooding prompted the United States Congress to pass the Flood Control Act of 1950, authorizing the federal development of additional dams and other flood control mechanisms. By that time, however, local communities had become wary of federal hydroelectric projects, and sought local control of new developments; a Public Utility District in Grant County, Washington ultimately began construction of the dam at Priest Rapids.[109]
In the 1960s, the United States and Canada signed the Columbia River Treaty, which focused on flood control and the maximization of downstream power generation.[105] Canada agreed to build dams and provide reservoir storage, and the U.S. agreed to deliver to Canada one-half of the increase in U.S. downstream power benefits as estimated five years in advance.[110] Canada's obligation was met by building three dams (two on the Columbia, and one on the Duncan River), the last of which was completed in 1973.[111]
Today the main stem of the Columbia River has 14 dams, of which three are in Canada and 11 in the U.S. Four mainstem dams and four lower Snake River dams contain navigation locks to allow ship and barge passage from the ocean as far as Lewiston, Idaho. The river system as a whole has more than 400 dams for hydroelectricity and irrigation.[16] The dams address a variety of demands, including flood control, navigation, stream flow regulation, storage and delivery of stored waters, reclamation of public lands and Indian reservations, and the generation of hydroelectric power.[112]dental implants dentist sydney
Pipe Bends |
|
FAQ
Search
Memberlist
Usergroups
Register
Profile
Log in to check your private messages
Log in
