Canadian Dam Association Bulletin - Winter 2018 - 15

unique effects of the highly variable
topography on the storm at both the
in-place storm location and the basin.
This process replaces the use of the
NWS Storm Separation Method (SSM).
Advanced computer-based technologies, Weather Service Radar WSR-88D
NEXt generation RADar (NEXRAD),
and HYSPLIT model trajectories were
used for storm analyses along with
new meteorological data sources,
such as updated storm analyses for
storms that have occurred since the
publication of HMRs and Environment
Canada storm reports (Atmospheric
Environment Service, 1985).
New technology and data were
incorporated into the study when they
improved reliability. This approach
provides the most complete scientific
application compatible with the engineering requirements of consistency and
reliability for credible PMP estimates.
For some applications such as storm
maximization, storm transpositioning,
defining PMP by storm type, and combining storms to create a PMP design
storm, this study applied standard
methods presented in previous publications (e.g. WMO Operational Hydrology
Reports 1986, 2009), while for other
applications, new procedures were
developed. Moisture analyses have
historically used monthly maximum
12-hour persisting dew point values
(3-hour persisting dew points were also
used in HMR 57). For this project, an
updated maximum average dew point
climatology was developed and merged
with the same dew point climatologies
developed by AWA across the contiguous United States. This updated dew
point climatology provided 100-year
recurrence interval values for 6-, 12-,
and 24-hour duration periods. These
recurrence intervals better represent
available atmospheric moisture used
to maximize individual storms versus the persisting dew point process
employed in the HMRs and previous
Canadian PMP studies. The maximum
dew point climatologies used the most
up-to-date periods of record, adding
over 40 years of data to the datasets
used in previous climatologies.
The ESRI ArcGIS for Desktop software environment was used extensively
Canadian Dam Association * Winter 2018

in the study for spatial
analysis, mapping, and
the organization and
manipulation of geospatial data. The Storm
Precipitation Analysis
System (SPAS) provided
gridded storm rainfall
analyses. SPAS results
produced both spatial
and temporal analyses for recent storm
events as well as being
used to re-analyze old
storm events.

Figure 3: Elevation contours at 1,000 foot intervals over Elbow
River Basin

2.2. Basin Description
The Springbank basin is located in
western Alberta. The centroid of the
basin is 50.89°N with a longitude of
114.69°W. The area of the drainage
basin to Glenmore Dam, the most
downstream point of interest in this
study, is approximately 1,212 square
kilometres. The average elevation
within the basin is 1,676 meters and
varies from 1,066 meters at Glenmore
Reservoir to 3,023 meters at Mount
Evan-Thomas. Figure 2 shows the basin
location and surrounding topography.

3. TOPOGRAPHIC EFFECTS
ON PMP RAINFALL
The terrain within the basin varies
significantly, often over relatively

869256_Multiure.indd 1

short distances (Figure 3). Elevation
increases from east to west across
the basin. This increase in elevation
helps to enhance lift in the lower
atmosphere and thereby increase
precipitation production. To account
for the enhancements of precipitation by terrain features (called
orographic effects), explicit evaluations were performed using precipitation frequency climatologies
and investigations into past storm
spatial and magnitude accumulation patterns across the basin and
surrounding region. The precipitation frequency climatologies were
developed as part of this study. These

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

BOARD OF DIRECTORS
PRESIDENT’S MESSAGE
UPDATING PMP FOR THE ELBOW RIVER: COMPLEX TERRAIN, UNIQUE SOLUTIONS
KELOWNA 2017
CDA AWARDS
ANNUAL GENERAL MEETING 2017
YOUNG PROFESSIONALS UPDATE
DAMS AND DIKES, WIKI STYLE
2017 FINANCE REPORT
CDA 2018 CONFERENCE: THE MANAGEMENT OF AGING DAMS
CDA NEWS BRIEF
BUYERS’ GUIDE AND TRADE LIST
Canadian Dam Association Bulletin - Winter 2018 - Intro
Canadian Dam Association Bulletin - Winter 2018 - cover1
Canadian Dam Association Bulletin - Winter 2018 - cover2
Canadian Dam Association Bulletin - Winter 2018 - 3
Canadian Dam Association Bulletin - Winter 2018 - 4
Canadian Dam Association Bulletin - Winter 2018 - 5
Canadian Dam Association Bulletin - Winter 2018 - 6
Canadian Dam Association Bulletin - Winter 2018 - BOARD OF DIRECTORS
Canadian Dam Association Bulletin - Winter 2018 - PRESIDENT’S MESSAGE
Canadian Dam Association Bulletin - Winter 2018 - 9
Canadian Dam Association Bulletin - Winter 2018 - UPDATING PMP FOR THE ELBOW RIVER: COMPLEX TERRAIN, UNIQUE SOLUTIONS
Canadian Dam Association Bulletin - Winter 2018 - 11
Canadian Dam Association Bulletin - Winter 2018 - 12
Canadian Dam Association Bulletin - Winter 2018 - 13
Canadian Dam Association Bulletin - Winter 2018 - 14
Canadian Dam Association Bulletin - Winter 2018 - 15
Canadian Dam Association Bulletin - Winter 2018 - 16
Canadian Dam Association Bulletin - Winter 2018 - 17
Canadian Dam Association Bulletin - Winter 2018 - 18
Canadian Dam Association Bulletin - Winter 2018 - 19
Canadian Dam Association Bulletin - Winter 2018 - 20
Canadian Dam Association Bulletin - Winter 2018 - 21
Canadian Dam Association Bulletin - Winter 2018 - 22
Canadian Dam Association Bulletin - Winter 2018 - 23
Canadian Dam Association Bulletin - Winter 2018 - 24
Canadian Dam Association Bulletin - Winter 2018 - 25
Canadian Dam Association Bulletin - Winter 2018 - KELOWNA 2017
Canadian Dam Association Bulletin - Winter 2018 - 27
Canadian Dam Association Bulletin - Winter 2018 - CDA AWARDS
Canadian Dam Association Bulletin - Winter 2018 - 29
Canadian Dam Association Bulletin - Winter 2018 - ANNUAL GENERAL MEETING 2017
Canadian Dam Association Bulletin - Winter 2018 - 31
Canadian Dam Association Bulletin - Winter 2018 - YOUNG PROFESSIONALS UPDATE
Canadian Dam Association Bulletin - Winter 2018 - 33
Canadian Dam Association Bulletin - Winter 2018 - DAMS AND DIKES, WIKI STYLE
Canadian Dam Association Bulletin - Winter 2018 - 35
Canadian Dam Association Bulletin - Winter 2018 - 2017 FINANCE REPORT
Canadian Dam Association Bulletin - Winter 2018 - 37
Canadian Dam Association Bulletin - Winter 2018 - 38
Canadian Dam Association Bulletin - Winter 2018 - 39
Canadian Dam Association Bulletin - Winter 2018 - CDA 2018 CONFERENCE: THE MANAGEMENT OF AGING DAMS
Canadian Dam Association Bulletin - Winter 2018 - 41
Canadian Dam Association Bulletin - Winter 2018 - CDA NEWS BRIEF
Canadian Dam Association Bulletin - Winter 2018 - 43
Canadian Dam Association Bulletin - Winter 2018 - 44
Canadian Dam Association Bulletin - Winter 2018 - BUYERS’ GUIDE AND TRADE LIST
Canadian Dam Association Bulletin - Winter 2018 - 46
Canadian Dam Association Bulletin - Winter 2018 - cover3
Canadian Dam Association Bulletin - Winter 2018 - cover4
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