However , as the top of the dam was not beheaded it was not protected from flood water that would over-top the crest .
The crest of the dam sloped towards the center which the engineers may have intended to use as a spillway .
As the top of the dam was not beheaded it was not protected from flood water that would over-top the crest .
The crest of the dam sloped towards the center which the engineers may have intended to use as a spillway .