Prayers for members Harvey and Al Weidman., The Oroville Dam E-Spillway is failing. |
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Prayers for members Harvey and Al Weidman., The Oroville Dam E-Spillway is failing. |
ConeDodger |
Feb 12 2017, 08:10 PM
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#1
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Apex killer! Group: Members Posts: 23,569 Joined: 31-December 04 From: Tahoe Area Member No.: 3,380 Region Association: Northern California |
The dam itself is apparently holding, but the Emergency Spillway which is being used for the first time in the 50 year history of the dam is eroding away quickly and expected to fail. Oroville is below the dam.
Residents have been told to evacuate. (IMG:style_emoticons/default/sad.gif) |
GregAmy |
Feb 15 2017, 06:20 PM
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#2
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Advanced Member Group: Members Posts: 2,268 Joined: 22-February 13 From: Middletown CT Member No.: 15,565 Region Association: North East States |
The erosion of concern last weekend was for that area below the emergency weir, not the main 770' dam.
CA DWR has been doing an excellent job of providing up to date photos of weir damage repair: http://pixel-ca-dwr.photoshelter.com/galle...Spillway-Damage In the link below (not allowed to insert photo here), the area that caused the concern is the dark grey grouted area in the foreground. Look in that second "before" photo, and you can see how that was working its way up toward the weir (it's the area to the far lower left in the photo). Had that erosion made it all the way there it could have compromised and collapsed the weir. If that end of the weir let go, it may have taken the whole thing with it, and potentially continued across to take out the primary spillway. And that would have been "really bad". They were backed into an ugly corner that evening: allow the reservoir level to increase and risk losing the weir, or increase the flows through the primary spillway to reduce the reservoir level, and risk further damage to the spillway. Someone made the (in hindsight, clearly correct) gutsy call for the second option, and the primary spillway handled the extra load just fine, allowing the reservoir level to drop below 901 (and continuing as we type). Today: http://pixel-ca-dwr.photoshelter.com/galle...-02-15-2017-jpg Before: (IMG:http://www.914world.com/bbs2/uploads_offsite/media.viafoura.net-15565-1487204451.1.jpg) |
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