Interesting. Mr. Hoover must have been familiar with how past civilizations put a great deal of attention to this kind of calculations and left traces of their

Interesting. Mr. Hoover must have been familiar with how past civilizations put a great deal of attention to this kind of calculations and left traces of their presence using similar techniques. However those past civilization also knew that our planet likes to reshuffle its surface from time to time and structures that would survive such reshuffling either need to be massive or need to be strategically placed in spots that won't be affected. I'm not sure if the dam is built in one of such places.