I've watched it - and to be honest, if people are commenting without watching it, well, it kinda sums up this thread.
Emma wanted him to say funding was short and was trying to fish a sensational angle, like she always does. The irony being of all the structures under CART - reservoirs are arguably the most protected and pretty much ring fenced. There is no way to delay or ignore any task for a reservoir in favour of a TV advert or a signage programme. Personally, i think he did well in the face of a populous who want to blame someone, anyone for a freak set of conditions.
The fact there are no deaths, that an evacuation was completed and the fact that a multi agency groups came together to fix a problem is being ignored. Alert systems did work.
The only people qualified to comment on cause are those with engineering degrees and experience in structure design / fracture mechanics. Because if you don't, well, you're waffling about things you don't understand truly.