[EarthResearcher333]

"How would this be done today with updated knowledge/technology?"

I'm assuming you're asking about the drains...

The FRpost link below provides modern design technology based on spillway design history and failure knowledge gained. Oroville's main flaw was in designing the drain "within" the slab, thus forming thinning zones (and severe slab cracking in the drain pipe zones). Aggravating this was that the slab design had no bottom rebar reinforcement, which affected the flexure resistance. Modern designs incorporate a superior "water stop" system to minimize water penetration at the expansion joint seams of the concrete slabs. What is not shown in the FRpost modern design drawing is the same type of downslope "collector" drains. This would be the same as done in the Oroville design (gravity flow collectors to sidewall outlet drains).

note: the worst case 40% thinning reference has been found to be up to 60% thinning due to the bell coupling dimensions + the 6" VCP pipe upsizing from the original spec 4" VCP pipe blueprint drawings. The Board Of Consultants have confirmed the "thinning" problem (but did not go into further specifics - likely a hot topic structural design flaw if revealed to the press/public).

Modern Spillway Design vs Oroville Design - 2 Dam Failures, Drain Pipe, Rebar, "Hydraulic Jacking", "Void" Finding by Radar

[EarthResearcher333]

= = Off topic note: = =

My posting updates may become sporadic. Another heart arrhythmia condition is recurring and may require a new operation (after a history of multiple ablations). I apologize if I am unable to respond to queries in a timely manner.

[Repeal The 17th]

Thanks!

[EarthResearcher333]

DWR Deleted image - No longer included in the image gallery

Something interesting. This image is no longer found in the image gallery. Not sure why. I put notes on this "saved" image - i.e of points of note. Perhaps DWR felt that the slop of hardened repair mortar looked unprofessional and removed it from the gallery (btw- another "lake view" reservoir image inserted in replacing this one).

Not sure what to make of the odd tilt of the rock bolt. Checking zooms of other rock bolts (they all look perfect & straight vertical) and accounting for camera angle, this rock bolt shows a "tilt". Perhaps the drilling angle was specified from what was observed with the ground penetrating radar.

Deleted DWR image from gallery. Tilted rock bolt. Mortar slop, chipped repair mortar (assumed from recent spillway flow).