Association of State Dam Safety Officials.
The Phreatic Line! The what? Learn all about it here!
And -Seepage! It’s a nightmare and needs monitoring.
Learn all about the Phreatic line and slope ratios here
This document states that dams slopes should be between 2:1 and 3:1 ration of dam base length to height. The Fairport dam is 1:1 and worse in places. This should send alarm bells ringing for even the poorest mathematician.