Canadian Dam Association Bulletin - Spring 2018 - 11

ABSTRACT
This paper outlines layout and design considerations for a reservoir filling at the Site C Clean
Energy Project. The Site C Clean Energy Project is a 1,100 MW hydroelectric generating station
with a 60 m high dam on the Peace River near Fort St. John, BC, Canada. The project includes
two fully submerged diversion tunnels each 10.8 m in diameter with gated inlet structures. The
capacity of the diversion tunnels needs to be reduced during reservoir filling to allow the reservoir to fill with normal inflows from upstream. The inlet closure gates are not capable of safely
restricting flows, thus alternative methods of maintaining minimum downstream environmental
flow releases of 390 m3/s and providing adequate energy dissipation during reservoir filling
were examined. The selected alternative was to install a series of four in-line orifices in one of
the diversion tunnels prior to reservoir filling. The orifice design is based on work in China on
the Xiaolangdi project, as well as physical hydraulic modelling (PHM) and computational fluid
dynamics (CFD) modelling.

RÉSUMÉ
Cette publication présente les considérations d'arrangement et de design de la mise en eau
du réservoir du projet du Site C Energy. Le projet du Site C (Site C Clean Energy Project) est un
projet hydroélectrique de 1,100 MW qui comprend un barrage de 60 m de hauteur sur la rivière
de la Paix près de Fort St. John, BC, Canada. Le projet inclut deux tunnels submergés de 10.8 m
de diamètre chacun équipés de vannes de régulation amont. La capacité des tunnels de dérivation doit être réduite durant la mise en eau du réservoir afin de permettre son remplissage dans
des conditions normales de débit fluvial. Les vannes amont ne sont pas capables de restreindre
suffisamment le débit d'une manière sécuritaire. Par conséquent, des méthodes alternatives de
dissipation d'énergie durant la mise en eau ont été étudiées afin de maintenir le débit réservé
environnemental minimum de 390 m3/s et de permettre une dissipation d'énergie suffisante.
L'option retenue a consisté à installer des d'orifice en série dans l'un des tunnels de dérivation.
Le design de ces orifices ont été basés sur les travaux du projet de Xiaolangdi en Chine, une
modélisation physique hydaulique, ainsi que des simulations en modélisation numérique de
dynamique des fluides.

Canadian Dam Association * Spring 2018

11



Table of Contents for the Digital Edition of Canadian Dam Association Bulletin - Spring 2018

Board of Directors
President’s Message
Site C Clean Energy Project Diversion Tunnel Orifices for Energy Dissipation During Reservoir Filling
Application for 2018 CDA Scholarships
CDA Presents 2017 Scholarships
ICOLD Corner
CDA Conference 2018
EIC Awards Gala
Buyers’ Guide and Trade List
Canadian Dam Association Bulletin - Spring 2018 - 1
Canadian Dam Association Bulletin - Spring 2018 - cover1
Canadian Dam Association Bulletin - Spring 2018 - cover2
Canadian Dam Association Bulletin - Spring 2018 - 3
Canadian Dam Association Bulletin - Spring 2018 - 4
Canadian Dam Association Bulletin - Spring 2018 - 5
Canadian Dam Association Bulletin - Spring 2018 - 6
Canadian Dam Association Bulletin - Spring 2018 - Board of Directors
Canadian Dam Association Bulletin - Spring 2018 - President’s Message
Canadian Dam Association Bulletin - Spring 2018 - 9
Canadian Dam Association Bulletin - Spring 2018 - Site C Clean Energy Project Diversion Tunnel Orifices for Energy Dissipation During Reservoir Filling
Canadian Dam Association Bulletin - Spring 2018 - 11
Canadian Dam Association Bulletin - Spring 2018 - 12
Canadian Dam Association Bulletin - Spring 2018 - 13
Canadian Dam Association Bulletin - Spring 2018 - 14
Canadian Dam Association Bulletin - Spring 2018 - 15
Canadian Dam Association Bulletin - Spring 2018 - 16
Canadian Dam Association Bulletin - Spring 2018 - 17
Canadian Dam Association Bulletin - Spring 2018 - 18
Canadian Dam Association Bulletin - Spring 2018 - 19
Canadian Dam Association Bulletin - Spring 2018 - 20
Canadian Dam Association Bulletin - Spring 2018 - 21
Canadian Dam Association Bulletin - Spring 2018 - 22
Canadian Dam Association Bulletin - Spring 2018 - 23
Canadian Dam Association Bulletin - Spring 2018 - 24
Canadian Dam Association Bulletin - Spring 2018 - 25
Canadian Dam Association Bulletin - Spring 2018 - Application for 2018 CDA Scholarships
Canadian Dam Association Bulletin - Spring 2018 - 27
Canadian Dam Association Bulletin - Spring 2018 - CDA Presents 2017 Scholarships
Canadian Dam Association Bulletin - Spring 2018 - 29
Canadian Dam Association Bulletin - Spring 2018 - ICOLD Corner
Canadian Dam Association Bulletin - Spring 2018 - 31
Canadian Dam Association Bulletin - Spring 2018 - CDA Conference 2018
Canadian Dam Association Bulletin - Spring 2018 - 33
Canadian Dam Association Bulletin - Spring 2018 - EIC Awards Gala
Canadian Dam Association Bulletin - Spring 2018 - 35
Canadian Dam Association Bulletin - Spring 2018 - 36
Canadian Dam Association Bulletin - Spring 2018 - 37
Canadian Dam Association Bulletin - Spring 2018 - Buyers’ Guide and Trade List
Canadian Dam Association Bulletin - Spring 2018 - cover3
Canadian Dam Association Bulletin - Spring 2018 - cover4
https://www.nxtbook.com/naylor/CDAQ/CDAQ0119
https://www.nxtbook.com/naylor/CDAQ/CDAQ0418
https://www.nxtbook.com/naylor/CDAQ/CDAQ0318
https://www.nxtbook.com/naylor/CDAQ/CDAQ0218
https://www.nxtbook.com/naylor/CDAQ/CDAQ0118
https://www.nxtbook.com/naylor/CDAQ/CDAQ0417
https://www.nxtbook.com/naylor/CDAQ/CDAQ0317
https://www.nxtbook.com/naylor/CDAQ/CDAQ0217
https://www.nxtbook.com/naylor/CDAQ/CDAQ0117
https://www.nxtbook.com/naylor/CDAQ/CDAQ0416
https://www.nxtbook.com/naylor/CDAQ/CDAQ0316
https://www.nxtbook.com/naylor/CDAQ/CDAQ0216
https://www.nxtbook.com/naylor/CDAQ/CDAQ0116
https://www.nxtbook.com/naylor/CDAQ/CDAQ0415
https://www.nxtbook.com/naylor/CDAQ/CDAQ0315
https://www.nxtbook.com/naylor/CDAQ/CDAQ0215
https://www.nxtbook.com/naylor/CDAQ/CDAQ0115
https://www.nxtbookmedia.com