Canadian Dam Association Bulletin - Summer 2018 - 17

the mountain ranges. The west to
east circulation limits the arrival of
moisture from the Atlantic but there
are documented storms that have originated in the Gulf of Mexico and
released extreme rainfalls in northwestern Alberta (AB) and northeastern BC. Brimelow and Reuter (2005)
describe three extreme summer rainfall events that occurred over the
southern Mackenzie River basin that
originated from the Gulf of Mexico.
Two of the events released 140 mm of
precipitation over a 48 hour period in
the southern Mackenzie River Basin.
The events occurred when air originating over the subtropical waters of
the Gulf of Mexico were transported
north by the Great Plains low-level
jet (LLJ) as described in Brimelow
and Reuter (2005). The environmental
impact statement for the Site C hydroelectric project indicates that during
May, June and July northeastern BC
is subject to cold lows that can persist for days that can draw Gulf of
Mexico air into the area resulting in
prolonged rainfall (BCH, 2013).
Pomeroy et al. (2016) describe the
intense slow-moving rainfall event that
caused the June 2013 flood in the South
Saskatchewan (AB) and Elk River (BC)
basins resulting in up to 350 mm of
rain over 3 days caused by large scale
atmospheric conditions as far away as
Yukon and Colorado.
Hogg and Carr (1985) in the Rainfall
Frequency Atlas for Canada, provide regional maps of the mean and
standard deviation of annual rainfall extremes for durations varying from 5 minutes up to 24 hours.
Mean annual values of 24 hour
duration rainfall varies from 140 to
160 mm along the western side of
Vancouver Island and 150 mm north
of Vancouver, to as low as 20 mm near
Penticton, Kamloops and Williams
Lake. Mean annual 24 hour extreme
rainfall generally decreases west
to east into the interior of BC and
increases again from the interior to
the eastern side of the province. Mean
annual extreme rainfall in YT is the
largest in the northeastern portion of
the region at 30 mm and decreases to
the west and north.
Canadian Dam Association * Summer 2018

3.2 Atmospheric Rivers
Ralph et al. (2017) offers the following definition of an Atmospheric
River (AR): A long narrow and transient corridor of anomalously strong
horizontal water vapor transport
that is typically located in the lowest
3 km of the troposphere and associated with a low-level jet stream
ahead of the cold front of an extratropical cyclone. The water vapor
in atmospheric rivers is supplied by

891937_American.indd 1

tropical and/or extratropical moisture sources and atmospheric rivers
frequently lead to heavy precipitation where they intersect topographic
or other lower-tropospheric boundaries, or enter into the warm-conveyor-belt related isentropic upward air
motion. Atmospheric rivers conduct
over 90 percent of all poleward water
vapor transport in the extra tropics
in less than 10 percent of the zonal
circumference of the globe.

07/11/17 17
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Table of Contents for the Digital Edition of Canadian Dam Association Bulletin - Summer 2018

Board of Directors
President’s Message
Inflow Design Flood Estimation for Reservoirs in British Columbia and Yukon Territory
ICOLD 2018: Canadian Expertise on the World Stage
ICOLD Corner
CDA Will Be Meeting in Quebec City!
CDA Directors & Officers – Call for Nominations
2018 CDA Awards – Call for Nominations
Notice of Annual General Meeting
Time to Renew Your Membership
Clean Energy B.C.'s Operational Excellence Award for Corra Linn Dam
Buyers’ Guide and Trade List
Canadian Dam Association Bulletin - Summer 2018 - Intro
Canadian Dam Association Bulletin - Summer 2018 - cover1
Canadian Dam Association Bulletin - Summer 2018 - cover2
Canadian Dam Association Bulletin - Summer 2018 - 3
Canadian Dam Association Bulletin - Summer 2018 - 4
Canadian Dam Association Bulletin - Summer 2018 - 5
Canadian Dam Association Bulletin - Summer 2018 - 6
Canadian Dam Association Bulletin - Summer 2018 - Board of Directors
Canadian Dam Association Bulletin - Summer 2018 - President’s Message
Canadian Dam Association Bulletin - Summer 2018 - 9
Canadian Dam Association Bulletin - Summer 2018 - Inflow Design Flood Estimation for Reservoirs in British Columbia and Yukon Territory
Canadian Dam Association Bulletin - Summer 2018 - 11
Canadian Dam Association Bulletin - Summer 2018 - 12
Canadian Dam Association Bulletin - Summer 2018 - 13
Canadian Dam Association Bulletin - Summer 2018 - 14
Canadian Dam Association Bulletin - Summer 2018 - 15
Canadian Dam Association Bulletin - Summer 2018 - 16
Canadian Dam Association Bulletin - Summer 2018 - 17
Canadian Dam Association Bulletin - Summer 2018 - 18
Canadian Dam Association Bulletin - Summer 2018 - 19
Canadian Dam Association Bulletin - Summer 2018 - 20
Canadian Dam Association Bulletin - Summer 2018 - 21
Canadian Dam Association Bulletin - Summer 2018 - 22
Canadian Dam Association Bulletin - Summer 2018 - 23
Canadian Dam Association Bulletin - Summer 2018 - 24
Canadian Dam Association Bulletin - Summer 2018 - 25
Canadian Dam Association Bulletin - Summer 2018 - 26
Canadian Dam Association Bulletin - Summer 2018 - 27
Canadian Dam Association Bulletin - Summer 2018 - ICOLD 2018: Canadian Expertise on the World Stage
Canadian Dam Association Bulletin - Summer 2018 - ICOLD Corner
Canadian Dam Association Bulletin - Summer 2018 - CDA Will Be Meeting in Quebec City!
Canadian Dam Association Bulletin - Summer 2018 - 31
Canadian Dam Association Bulletin - Summer 2018 - 32
Canadian Dam Association Bulletin - Summer 2018 - 33
Canadian Dam Association Bulletin - Summer 2018 - CDA Directors & Officers – Call for Nominations
Canadian Dam Association Bulletin - Summer 2018 - 2018 CDA Awards – Call for Nominations
Canadian Dam Association Bulletin - Summer 2018 - Notice of Annual General Meeting
Canadian Dam Association Bulletin - Summer 2018 - Time to Renew Your Membership
Canadian Dam Association Bulletin - Summer 2018 - 38
Canadian Dam Association Bulletin - Summer 2018 - Clean Energy B.C.'s Operational Excellence Award for Corra Linn Dam
Canadian Dam Association Bulletin - Summer 2018 - 40
Canadian Dam Association Bulletin - Summer 2018 - Buyers’ Guide and Trade List
Canadian Dam Association Bulletin - Summer 2018 - 42
Canadian Dam Association Bulletin - Summer 2018 - cover3
Canadian Dam Association Bulletin - Summer 2018 - cover4
Canadian Dam Association Bulletin - Summer 2018 - outsert1
Canadian Dam Association Bulletin - Summer 2018 - outsert2
Canadian Dam Association Bulletin - Summer 2018 - outsert3
Canadian Dam Association Bulletin - Summer 2018 - outsert4
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