The Hoover dam is both a gravity dam and a sideways roman arch dam. It contains no rebar, as such, because none is needed. It does contain a matrix of one inch pipe that was used to cool the concrete as it heated up during it's cure.
Dark Stool is a moron.
The problem is; DS can't grasp the concept of solely using concrete (not adding reinforcing steel) in the design of the Dam. This has sealed his Fate as "I'm an Engineer". He's a TOTAL FRAUD.