They CONTINUE to have a significant environmental impact as long as they are flooded upstream (and downstream for that matter). And a dam that ISNT flooded upstream doesnt really produce much power ya know. I’v seen more than one study that claims that dams are sometimes a net economic loss, because the value of the power they produce is less than the value of the land they flood.
If America could DOUBLE its hydro production, which I think is a pipe dream, it would get up to about 10 percent of total electrical production.
Dams silt up. Random stuff on the net seems to indicate most dams silt up faster than nuclear reactors wear out. What do you do once its silted up and no longer providing power?
And safety? Oh baby, hows THIS for a death toll?
"According to China Newsweek reports, among the 85,000 plus reservoirs in China, over 30,000 (35 percent) have problems but continue to be operational, constituting a major hidden danger in water resource facilities.
Now, in China, not one province, city, or district is free of dangerous reservoirs. In the provinces of Hunan, Guangdong, Sichuan, Shandong, Yunnan, Hubei, and Jiangxi, each province has more than 1,600 dangerous reservoirs. In Guangdong Province, there are 3,685 dangerous reservoirs—a total of 55 percent of all reservoirs in the province…
…In the world’s record of disasters due to human technical failures, the 1975 collapse of China’s Banqiao reservoir dam in Henan province ranked first, which is higher than the Chernobyl disaster in the former Soviet Union. In a matter of days, 26 dams collapsed one after another, which resulted in massive flooding in nine counties and one town. More than 100,000 corpses were retrieved when the flooding receded. Deaths due to the repercussions of grain shortages and infectious diseases amounted to 140,000; while the total number of deaths recorded was 240,000. This death toll was comparable to the China’s Tangshan earthquake in the following year, and the damage dealt was worse than the collapse of Egypt’s Aswan reservoir dam."
And there are plenty of other big assed dams in the US and the world that could let go and kill bunches of people.
If you think nuclear engineers will frack up and kill many (which they really havent yet), why do you not think dam engineers won’t do the same at some point?