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Puget Sound Chapter Meeting
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11/16/2017
When: November 16, 2017
5:30 PM
Where: Best Western Executive Inn
200 Taylor Ave N
Seattle, Washington  98108
United States
Contact: Justin Vetter
206-403-4230

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November 16, 2017 (Thu)
Joint meeting with ASCE;

Speaker: Mike Bruen, Stantec

Topic: Conditions Assessment of a Dam, Tunnel, and Power Station at a Hydropower Project in Nepal
Location: Best Western Executive Inn, Seattle, WA.
Time: 5:30 – Social Hour; 6:30 – Dinner; 7:30 – Presentation
Place: Best Western Executive Inn, 200 Taylor Avenue North, Seattle, WA 98109 ( map ), 206-448-9444
Dinner: Plated dinner - please choose between the following when registering for the meeting:
          ● Lemongrass Marinated Chicken Breast served with rice noodles and sautéedvegetables
          ● Petite New York Strip 8oz. New York steak with dijon mushroom demi-glace, served with garlic mashed potatoes and a seasonal vegetable medley
          ● Chef’s Choice Vegetarian Option a chef’s choice of a vegetarian meal
RSVP: Register for this AEG/ASCE joint meeting at the Brown Paper Tickets website: https://asceandaeg.brownpapertickets.com by 3PM on Friday, November 10 , no exceptions .
Registering by the deadline assures you get a meal and a seat.
Cost: $40 for members; $45 for non-members; $15 for students. Non-members always welcome!
Note that the pay at the door option is only intended for use if you cannot use a debit/credit card when registering for the meeting.

Our gracious sponsor, Geokon, has made it possible for the AEG Puget Sound Chapter to provide meals at a reduced rate for AEG Student Members. Please go to http: www.geokon.com for more information. Thank you, Geokon!

Student membership in AEG is free! Please go to www.aegweb.org and click on the “Join AEG” tab if you are interested in becoming a member of AEG.

Presentation Abstract:

From 2014 - 2016, three natural hazards, large landslides, an earthquake and major flooding, significantly damaged the Upper Bhote Koshi (UBK) Hydropower Project, a run-of-the-river
hydroelectric project in Nepal.

The first strike occurred on August 2, 2014 when a massive landslide downstream of the power station knocked out three transmission towers. The landslide, with an estimated volume of 6 MCM, dammed the river, creating a lake that stretched 3 km upstream. A total of 156 fatalities were attributed to this event. The M7.8 Gorkha earthquake less than a year later was the second strike to the project. At the time of the earthquake, the plant went through an unscheduled emergency shutdown and appeared to be undamaged. However, numerous aftershocks including M6.7 and M7.3 events de-stabilized the slopes, triggering rockfall above the project facilities and landslides and debris flows throughout the area. It was rockfall debris that rained down on the 2 m diameter surface penstock and ultimately ruptured the pipe resulting in an uncontrolled dewatering of the headrace tunnel, releasing more than 50,000 m 3 of water that severely damaged the penstock and flooded the powerhouse.

The latest strike, occurred on July 5, 2016 while the project, which was still under repair, was hit by a catastrophic debris-laden flood event that severely damaged the headworks and again flooded the powerhouse. At the time of the event, the Bhote Koshi River peaked at about +3.5 m above the top of the dam (2600 m 3 /s). The flood event was significant as the bed load carried an overabundance of large boulders (4 m to 10 m diameter). At the headworks, the flood event caused the ultimate destruction of the desanding basin, as the riverside wall
failed, and with the river choked off, the river was redirected, eroding the abutment creating a channel that bypassed the dam.

Speaker Bio:

Mike Bruen is a Vice President with MWH now a part of Stantec, and has served in various roles including Senior Project Manager, Senior Tunnel Specialist, and Engineering Geologist
specializing in tunnels and underground engineering and construction for wet infrastructure, hydropower, and dam projects. Mike has more than thirty five years of experience working
in North America, Central and South America, Asia, and the Middle East. He has been involved in over 50 tunnel projects, totaling more than 100 miles of tunnels and up to 33 ft in
diameter, more than 60 shafts, and caverns worldwide. Selected project experience includes the Tunnel and Reservoir Plan (TARP, Chicago), Lake Mead Intake 3 (Las Vegas),
Brightwater Conveyance and Fremont Siphon (Seattle), Deep Storm Water Tunnel System (Dubai), Bath County Pumped Storage Project (VA), the Esti Hydroelectric Project
(Panama). Recently he was the lead author for the chapter on Water Tunnels for the UCA of SME book, the “History of Tunneling in the United States”.

He has a bachelor of science degree from the University of New Hampshire and a master of arts degree at SUNY Buffalo in geology. He is a member of AEG, UCA of SME, ITA, PMI
USSD, and the DRB Foundation.

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