At first glance, the sidewall drains @ 50K cfs looks quite a bit less than before. It will be interesting to compare it to an earlier pic.
IIRC, there was a period after the failure where they were operating @ 50K cfs for a few days.
DWR's update stated they fully sealed all of the cracks and seams. If this is accurate, the question becomes - where is the water coming from? Evidence indicates that lower pressure (flows) show a fully sealed chute. However, when the chute is operated at higher pressure (flows), the drain(s) water appears.
1. Is there are a myriad of microfractures that allow migration of water under this higher pressure?
2. Were the repairs inadequate for the higher pressures?
3. Is there a "subsurface piping" flow that rises to the drains under the higher pressure?
4. Whatever the causation the distribution of water in the drains are fairly consistent (i.e. all of the drains are showing waterflow - even if there is a slight imbalance on some). This implies that the causation mechanism either is self balancing (in the subsurface), or is balanced by the presence of the distribution of equal pressure of the chute.
Just discussion queries... time & evidence will likely give clues...
An interesting note: The rock bolts & plates revealed turbulent standing waves when the spillway was ramped up. It will be interesting to see if any cavitation erosion appears at these locations after the spillway is shut down again.