The Black Death was a plague the spread across medieval Europe in 590CE to 1500CE. It was an infection caused by rats and then spread by fleas. The rats were carrying a lot of germs and bacteria at the time so a flea would bite the rat and then would and bite a person.
The average life expectancy of a dam is 50 years, and 25% of the dams in the Army Corps of Engineers National Inventory of Dams are now more than 50 years old.This number is projected to increase to 85% by the year 2020.he Glen Canyon Dam supplies over 5 million people with power (Glen Canyon Dam Adaptive Management Program, 2007). These two dams also have the capacity to store 32,471,000 acre-feet and 27,000,000 acre-feet of water, respectively. In order to harvest hydropower however, dams must be built.
3. Grande Dixence Dam, Switzerland â 285 m (935 ft). A Concrete gravity on the Dixence River. At 285 m (935 ft) high, it is the tallest gravity dam in the world.Itâs primary purpose is hydroelectric power generation.he highest dam in India. It is a multi-purpose rock and earth-fill embankment dam on the Bhagirathi River. Itâs main purpose is electricity generation and it withholds a reservoir for irrigation and municipal water supply. 10 Tallest Dams In The World: Tehri Dam, India. 9. Mauvoisin Dam, Switzerland â 250 m (820 ft).