Canadian Dam Association Bulletin - Summer 2017 - 28

TABLE 4: FREQUENCY ANALYSIS FOR ANNUAL
INSTANTANEOUS FLOOD (M3/S) SERIES

Lawn

Gauging Station

Ratio
Source Q2
Source Q100
Transpose Q2 Transpose Q100 Transpose Q1,000

Salmonier River
(WSC#02ZG003)

0.758

66.8
50.6

173
131.1

236
178.9

Garnish River
(WSC#02ZG001)

0.478

52.9
25.3

191
91.3

323
154.4

38.0

111.2

166.6

20.8
23.6

100
113.5

188
213.4

Port Union

Transposed Average

Southern Bay River
(WSC#02JG001)

1.135

Figure 4: Extreme Value Approximations for Lawn and Port Union Developments

Figure 5: Rating Curves for Spillway and Dam Crest-Lawn
28

Source
Q1,000

The hydrologic runoff processes corresponds with the hydrologic conditions of the nearby gauged watersheds
located in the same region. Using this
assumption, the hydrologic response
at the gauged stations is transposed
using multiple linear regression equations of watershed metrics. In similar
physiographic regions, the most significant variable in transposition of
data is the watershed drainage area.
By using nearby watersheds in the
same physiographic sub-basin, data
is transposed using
Qsite
= Q gauge . [DAsite/DAgauge]x
Qsite
= Flood flow (m3/s) at site
of interest
Q gauge = Flood flow (m3/s) at
gauged station
DA site = Site watershed area (km2)
DAgauge = Gauged watershed area
(km2) and
x
= Adjustment coefficient
(0.8) [Anctil et al., 2005]
Lawn Development located in Burin
peninsula derives its flows from an
un-gauged watershed with a drainage
area of 81.4 km2 based on recent mapping. This results in a transposition
ratio for Salmonier River and Garnish
River of 0.758 and 0.478, respectively.
The Port Union Development is regulated through system storage which
includes Long Pond and Whirl Pond
reservoirs, which are the main water
storage reservoirs. Two upstream reservoirs at Halfway Pond and Wells Pond
were decommissioned years ago. The
system drainage area was calculated
as 79.0 km2 based on recent mapping.
This results in a transposition ratio
for Southern Bay River and Salmon
Cove of 1.135 and 1.058, respectively.
The resulting estimated peak flood
magnitude for the Lawn and Port Union
Developments are summarized in
Table 4 and Figure 4. Values are extrapolated one log cycle to an approximate
10,000 year event to capture peaks estimated during Hurricane Igor.
3.2 Hurricane Igor Flow at Lawn
HEC-HMS is used to develop a reservoir routing model and perform routing analysis flow during Igor. Rating
curves were prepared for the spillway
and the combined spillway and dam
during overtopping. The rating curve

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Table of Contents for the Digital Edition of Canadian Dam Association Bulletin - Summer 2017

Board of Directors
President's Message
Roller Compacted Concrete Buttress at the Site C Clean Energy Project
Hurricane Igor's Impact on Newfoundland Power's Small Hydro
CDA Conference Heads to Kelowna!
CDA Directors & Officers - Call for Nominations
2017 CDA Awards - Call for Nominations
CDA Developing New Ways to Distribute Guidelines
Notice of Annual General Meeting
Time to Renew Your Membership
Buyers' Guide and Trade List
Canadian Dam Association Bulletin - Summer 2017 - intro
Canadian Dam Association Bulletin - Summer 2017 - 1
Canadian Dam Association Bulletin - Summer 2017 - 2
Canadian Dam Association Bulletin - Summer 2017 - 3
Canadian Dam Association Bulletin - Summer 2017 - 4
Canadian Dam Association Bulletin - Summer 2017 - 5
Canadian Dam Association Bulletin - Summer 2017 - 6
Canadian Dam Association Bulletin - Summer 2017 - Board of Directors
Canadian Dam Association Bulletin - Summer 2017 - 8
Canadian Dam Association Bulletin - Summer 2017 - President's Message
Canadian Dam Association Bulletin - Summer 2017 - 10
Canadian Dam Association Bulletin - Summer 2017 - 11
Canadian Dam Association Bulletin - Summer 2017 - Roller Compacted Concrete Buttress at the Site C Clean Energy Project
Canadian Dam Association Bulletin - Summer 2017 - 13
Canadian Dam Association Bulletin - Summer 2017 - 14
Canadian Dam Association Bulletin - Summer 2017 - 15
Canadian Dam Association Bulletin - Summer 2017 - 16
Canadian Dam Association Bulletin - Summer 2017 - 17
Canadian Dam Association Bulletin - Summer 2017 - 18
Canadian Dam Association Bulletin - Summer 2017 - 19
Canadian Dam Association Bulletin - Summer 2017 - 20
Canadian Dam Association Bulletin - Summer 2017 - 21
Canadian Dam Association Bulletin - Summer 2017 - 22
Canadian Dam Association Bulletin - Summer 2017 - 23
Canadian Dam Association Bulletin - Summer 2017 - Hurricane Igor's Impact on Newfoundland Power's Small Hydro
Canadian Dam Association Bulletin - Summer 2017 - 25
Canadian Dam Association Bulletin - Summer 2017 - 26
Canadian Dam Association Bulletin - Summer 2017 - 27
Canadian Dam Association Bulletin - Summer 2017 - 28
Canadian Dam Association Bulletin - Summer 2017 - 29
Canadian Dam Association Bulletin - Summer 2017 - 30
Canadian Dam Association Bulletin - Summer 2017 - 31
Canadian Dam Association Bulletin - Summer 2017 - 32
Canadian Dam Association Bulletin - Summer 2017 - 33
Canadian Dam Association Bulletin - Summer 2017 - 34
Canadian Dam Association Bulletin - Summer 2017 - 35
Canadian Dam Association Bulletin - Summer 2017 - CDA Conference Heads to Kelowna!
Canadian Dam Association Bulletin - Summer 2017 - 37
Canadian Dam Association Bulletin - Summer 2017 - 38
Canadian Dam Association Bulletin - Summer 2017 - 39
Canadian Dam Association Bulletin - Summer 2017 - 40
Canadian Dam Association Bulletin - Summer 2017 - 41
Canadian Dam Association Bulletin - Summer 2017 - 42
Canadian Dam Association Bulletin - Summer 2017 - 43
Canadian Dam Association Bulletin - Summer 2017 - 44
Canadian Dam Association Bulletin - Summer 2017 - 45
Canadian Dam Association Bulletin - Summer 2017 - CDA Directors & Officers - Call for Nominations
Canadian Dam Association Bulletin - Summer 2017 - 47
Canadian Dam Association Bulletin - Summer 2017 - 2017 CDA Awards - Call for Nominations
Canadian Dam Association Bulletin - Summer 2017 - 49
Canadian Dam Association Bulletin - Summer 2017 - CDA Developing New Ways to Distribute Guidelines
Canadian Dam Association Bulletin - Summer 2017 - 51
Canadian Dam Association Bulletin - Summer 2017 - 52
Canadian Dam Association Bulletin - Summer 2017 - Notice of Annual General Meeting
Canadian Dam Association Bulletin - Summer 2017 - Time to Renew Your Membership
Canadian Dam Association Bulletin - Summer 2017 - Buyers' Guide and Trade List
Canadian Dam Association Bulletin - Summer 2017 - 56
Canadian Dam Association Bulletin - Summer 2017 - 57
Canadian Dam Association Bulletin - Summer 2017 - 58
Canadian Dam Association Bulletin - Summer 2017 - 59
Canadian Dam Association Bulletin - Summer 2017 - 60
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