The dangers of water
kyleb said:
The dangers of water are far cry from those of radioactive heavy metals.
Do you know what 10,000-year flood levels are? If you don't, neither do most persons who live below them.
http://www.usgs.gov/ppp2000/forum8.html
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Currently 85% of Presidentially declared disasters in the United States are related to floods. Floods are also the deadliest natural disasters, killing 140 Americans each year.
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The section "What will happen when a comet or asteroid strikes the Earth?" from this link...
http://personals.galaxyinternet.net/tunga/I3.htm
...talks about realistic tsunamis with deepwater heights of over a mile and runup heights several times that. The Indonesian tsunami that killed 200,000 to 300,000
had a deepwater height of only 60 centimeters.
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In deep water the impact tsunami height might be several thousand feet high for a K/T size impactor, but the height will increase dramatically as the waves reach the shoreline because the wave slows in shallow water and the energy becomes more concentrated. The impact tsunami may produce several mile high waves that could travel several hundred miles inland.
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When dams fail, people die:
http://www2.sjsu.edu/faculty/watkins/aug1975.htm
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The August 1975 Disaster
Some brave souls worked in waist-deep water amidst the thunderstorm trying to save the embankment. As the dam began to disintegrate one of these brave souls, an older woman, shouted "Chu Jiaozi" (The river dragon has come!) The crumbling of the dam created a wall of water 6 meters high and 12 kilometers wide moving. Behind this moving wall of water was 600 million cubic meters of more water.
Altogether 62 dams broke. Downstream the dikes and flood diversion projects could not resist such a deluge. They broke as well and the flood spread over more than a million hectares of farm land throughout 29 counties and municipalities. One can imagine the terrible predicament of the city of Huaibin where the waters from the Hong and Ru Rivers came together. Eleven million people throughout the region were severely affected.
Over 85 thousand died as a result of the dam failures. There was little or no time for warnings. The wall of water was traveling at about 50 kilometers per hour or about 14 meters per second. The authorities were hampered by the fact that telephone communication was knocked out almost immediately and that they did not expect any of the "iron dams" to fail.
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