[Repeal The 17th]

Yes, I noticed the core drilling going on at the front side of the emergency spillway.
Don’t know what’s up with that.

Do we know the lake level target for re-opening the gates?
It is at 860.39 as I type this (rose 1 1/2 ft. in 24 hrs).

[janetjanet998]

860-865

looking at the NWS river forecast just downstream it looks like they plan to open the spillway friday morning now

if the forecast is correct only 28,000 cfs is forecast to flow

this may mean they are going to try and spill water at a lower rate then last time

the photo did show them laying shotcrete between the spillway and plungepool on the eroded areas

[EarthResearcher333]

Hi Repeal The 17th, they need to assess "piping" risk.....

Coring/Drilling in Front of Emergency Spillway - Most Likely Trying to Understand "This" (submerged flow paths - troubling "piping" under/through weathered rock & grout curtain)

"This" => Bubbles observed from prior ES use observed from multiple locations in front of the Emergency Spillway. Any new proposed fix to the Emergency Spillway could be undermined if a "piping" channel exists in the highly fractured rock. A Grout Curtain (pumping grout into cracks and seams to form a water barrier) may have "cracks" where subsurface waterflow is not contained. Any waterflow under newly placed RCC for the New Proposed Spillway would face a "voiding" risk & eventual failure mode from an accelerated underground erosion channel or channels. The New Project Plans may need remedial construction measures depending on what they find (i.e. new excavation, sealing, new grout curtain,…)

Coring/Drilling in Front of Emergency Spillway - Most Likely Trying to Understand "This" (submerged flow paths - troubling "piping" under/through weathered rock & grout curtain)

Coring/Drilling in Front of Emergency Spillway - Most Likely Trying to Understand "This" (submerged flow paths - troubling "piping" under/through weathered rock & grout curtain)