bttt
DWR now says this current spill will last through the first week week of May(no surprise) also they are going to blast some of the cliffs.......
http://www.water.ca.gov/news/newsreleases/2017/042017_oroville_construction.pdf
The following activities, some already ongoing, are scheduled to begin April 21 through April 28.
DWR will provide regular updates on all activities over the coming months as construction
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Slope setback with controlled blasting
• As part of regular procedure, DWR will use controlled blasting methods to break up intact
rock on the slopes along the damaged gated flood control spillway so that it can be safely
excavated. The slopes are near vertical and are up to 150 feet in height. These slopes
present a significant safety risk for construction workers.
• The controlled blasting produces little to no audible noise or vibrations. A whistle/air horn
will alert workers near the project area prior to each controlled blast.
• Seismographs will be located throughout the project area so engineers can monitor
movements and to make sure recorded vibrations are within safe levels.
• The controlled blasting will begin as early as Friday, April 21, and will continue for four to
six weeks on approximately an every-other-day schedule, so that workers can start
making necessary repairs to the spillway to meet the tight construction schedule.
• DWR obtained required permits for the work from its state and federal regulatory
partners, as well as the Butte County Sheriff’s Department.
Gated flood control spillway flow release update
• The damaged gated flood control spillway also known as the main spillway, is currently
spilling 35,000 cubic feet of water per second. Based on current hydrologic modeling, the
spillway will continue at this flow through the first week in May