Hydrotechnical Considerations
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![Page 1: Hydrotechnical Considerations](https://reader036.fdocuments.in/reader036/viewer/2022062321/568137c7550346895d9f6471/html5/thumbnails/1.jpg)
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Hydrotechnical Considerations
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Overview
•Hydrotechnical Design
•River Issues
Lateral Stability
Vertical Stability
Blockage - ice, drift
•River Protection Works
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Hydrotechnical Design
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The Hydrologic Cycle
Groundwater
Mountains Lakes Streams
RiversOceans
Snowmelt
Sun
Evaporation
RainHailSnow
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Drainage Basin Parameters
•Area•Shape•Slope•Storage•Density•Vegetation•Soil Type•Initial Moisture
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Runoff Response Variation Across Alberta
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Hydrotechnical Design Guidelines
•Channel Capacity•channel size result of long-term runoff•channel size affects routing of runoff•typical channel•activate overbank storage
•Historic Highwater Data•HWM – AIT, AENV, WSC, site, airphoto, news•Location, description
•Runoff Potential•Limit on supply of runoff•Unit discharge
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Hydraulic Definitions
Thalweg
Water Surface
Y
AV = Q
QA
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Flow Constriction - Stream Crossing
Bridge
Culvert
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Flow
Bank
Flowlines - Before Constriction
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Flowlines - After Constriction
Q=V*A
Q= V*A
Q=V*A
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Flow Profile - After Constriction
Energy Grade Line
Water Surface
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File 00278 - Battle River
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File 00278 - Battle River
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File 00278 - Battle River
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File 75194 - Simonette River
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File 75194 - Simonette River
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File 75194 - Simonette River
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File 75194 - Simonette River
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File 75194 - Simonette River
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File 75194 - Simonette River
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File 75194 - Simonette River
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File 75194 - Simonette River
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File 07107 - Iron Creek
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BF76474 – Smoky River at Grande Cache
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File 80827 - Nelson Creek
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File 80827 - Nelson Creek
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File 79475 - Bald Mountain Creek
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File 79475 - Bald Mountain Creek
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File 79475 - Bald Mountain Creek
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File 79475 - Bald Mountain Creek
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File 01324 - Pigeon Creek
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File 01324 - Pigeon Creek
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File 78230 - Brewster Creek
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File 81653 - Watercourse
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River Issues
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Lateral Stream Stability
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1
2
3a
3b
4
5
Relative StabilityHigh Low
Rel
ativ
e S
tab
ility
Hig
hL
ow
Stability of Stream Types
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BF9259 – Freeman River
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BF8036 – Redwillow River
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BF13078 – Little Red Deer River
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File 81113 - Marten Creek
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File 75904 - Island Creek
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File 75904 - Island Creek
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File 75904 - Island Creek
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File 73204 - Whitehorse Creek
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File 73204 - Whitehorse Creek
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File 73204 - Whitehorse Creek
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File 73204 - Whitehorse Creek
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File 73204 - Whitehorse Creek
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Blockage - Drift, ice …
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File 78889 - Whitecourt Creek
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File 71979 - Heart River
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File 72964 – Howard Ck
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Drift accumulation can increase velocities around piers
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BF 6754 Bow River at Cluny
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Ice scarring on trees
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Ice impact damage and abrasion on piers
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Other debris?
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Vertical Stream Stability
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Deposition Reach•Flatter Slope•Aggradation•Deltas, Fans
Bedrock Sediment
Distance From Headwater (km)
Ele
vati
on
(m
)
Typical Stream Profile
Erosion Reach•Steeper Slope•Degradation
Transport Reach•Erosion = Deposition
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File 76995 - Malcolm Creek
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File 76617 - Cougar Creek
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File 76617 - Cougar Creek
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Dam
Aggradation
Degradation
QsD50 ~ QS
River Response
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BF74852 – Bear River
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BF74852 – Bear River
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BF73235 – Cucumber Ck
550
555
560
565
570
575
0 100 200 300 400 500 600 700 800 900
Station (m)
Ele
vati
on
(m
)
DTM
Survey
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BF73235 – Cucumber Ck
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BF73235 – Cucumber Ck
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General Scour
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BF74710 – Berland River
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Local Scour Profile
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Local Scour in Plan View
Flow Parallel to Pier
Flow on Skew to Pier
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Smoky River CanFor Bridge
Failure of a pier on spread footing due to general scour
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BF 78104 McLeod River near Peers - alignment problem
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River Protection Works
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Typical Rock Riprap Section
2
1
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EmbankmentSpurs
Guidebank
Dyke
Grade ControlStructure
Location of River Protection Works
Spurs
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File 81795B - Red Deer River (1992)
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File 81795B - Red Deer River
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File 81795B - Red Deer River
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File 81795B - Red Deer River
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File 81795B - Red Deer River
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File 81795B - Red Deer River (1999)
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File 81778B - Wapiti River
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File 81778B - Wapiti River
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File 81793B - Swan River
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File 81793B - Swan River
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File 81793B - Swan River
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…Questions?