The catastrophe on the Oroville Dam shocked the whole US. But the authorities react quickly and now the restoration is being actively carried out. To understand the scale of what happened, must see the huge piece of work is need to be done. The work doesn’t stop day and night, a lot of equipment was brought to the spillway. Thousands of lives and comfort of tens of thousands of people depend on the dam condition and the repairs quality.
The main spillway is finally getting some attention. With the expected spring runoff, the chance of requiring it to be opened is quite high so some preventative measures are in progress.
Shotcrete is being used to prevent further collapse underneath the top part of the spillway. There’s no doubt they’ll need to use this spillway again soon.
Crews working night and day have removed 216,000 cubic yards of the estimated 1.7 million cubic yards of debris as of March 4 at 8am.
The aim here is to deepen the channel which will help the Hyatt Power Plant reach full capacity sooner. Once fully operational, the plant can release up to 14,000 cfs, which is important for managing reservoir inflows and outflows through the spring runoff season. Keep in mind that the main spillway allowed 100,000 cfs of water to be released.
Night works time lapse.
This shows a few things:
– upper portion of the spillway appears to be anchored on bedrock.
– rebar in the original spillway concrete anywhere from 1.5″ – 2.0″ thick.
– concrete base of the spillway appears to be around 3 feet thick.