The Hoover Dam was built over five years from 1930 - 1935. Its reservoir holds 9.2 trillion gallons of water and produces 2.8GW of power, roughly as much as 3 nuclear power stations.
The Colorado river flows south west through the Hoover dam and down towards the Gulf of California but so much is used on the way that only very little reaches Mexico.
20% of the worlds fresh water
Channel flow is how much water flows through a channel.
2.79 gallons per second
about 16,000 tons flow through space and go on the edge of saturn atmmsphere
It depends on the amount of pressure behind it.
Flows through McNary Dam usually range from 50 to 350 KCFS (374,000- 2,618,00 gallons/sec) depending on the time of year.
how much water does the ganges river carries
Around 30% of the Nile River comes from the White Nile.
The Amazon River, the second largest river in the world, flows through much of Brazil.
That depends on the pressure behind the flow, and on the length of time the flow is allowed to continue.
http://www.youtube.com/watch?v=cEL7yc8R42k ^ a very good video summary on Hydroelectric power Basically water flows through the dam and through a turbine. This spins the turbine, which in turn spins a generator. The generator creates electricity by having magents go around copper.