Estok said the Corps can operate the dam to its full flood storage capacity as designed, now that important risk reduction measures are nearing completion.
The Corps also is making good progress on a detailed dam safety study to ensure all significant and credible risks have been evaluated. The study is scheduled Nike Shoes Vector
A once weakened Howard Hanson Dam should operate at full capacity this winter.
to be completed by the end of 2013.
Installation of additional log booms to prevent debris from blocking the spillway.
Measures slated for completion in 2012, include:
The Corps constructed a seepage barrier (grout curtain) in November 2009 to reduce seepage and Nike Shoes Latest 2018
Further stabilizing the spillway by improving its anchoring to bedrock.
"All indications are that the new measures will perform as intended to full flood storage capacity," Estok said on Friday. "However, until the dam experiences a flood above summer pool level (1,167 feet), there isn't 100 percent certainty of how the new measures will perform."
The reservoir at Howard Hanson Dam reached a summer elevation of 1,167 feet above sea level in June, Nike Red Shoes New allowing engineers, geologists and other scientists to run a battery of tests to gather more data on the right abutment drainage improvements that are completed and underway.
Army Corps intends to operate Howard Hanson Dam to full capacity
Drainage improvement work is on schedule and is expected to be complete by the end of October, the Corps said. The Corps said it has already treated and tested drains through the area of highest concern, known as the short path seepage area.
Placing additional rock along the upstream face of the dam to protect it against erosion from fast moving water in the event the spillway is used.
Seattle District engineers and scientists have concluded that the Corps can operate the dam this season to hold its design full pool an elevation of 1,206 feet above sea level with low risk to the dam.
The Corps will continue to monitor the dam to ensure effectiveness of the corrective measures, especially during high flow Nike Shoes Red Color
So says a confident Col. Army Corps of Engineers.
improved the drainage collection system of the right abutment by installing drains that more effectively direct seepage into the drainage tunnel. Last flood season, the Corps said it had confidence that it could safely store water to at least elevation 1,170 feet. Testing showed that the work was successful; however, the 2009 grout curtain is not considered a permanent repair.
"We are pleased that the Corps has been able to restore the original flood protection of the Howard Hanson Dam far ahead of the original time schedule," said Sarah Miller, emergency preparedness manager for the City of Auburn. "Obviously there is still, and always will be, flood risk in the Green River Valley. But with the dam functioning within its design parameters, we are much more comfortable going into the upcoming winter season."
Local officials welcomed the good news.
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