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Hydrotechnical Design Parameters Channel Hydraulics Culvert Hydraulics Culvert Sizing. Hydrotechnical Design Parameters. Area. Shape. Slope. Storage. Density. Vegetation. Soil Type. Initial Moisture. Gauges >30 Years (212). Options - Statistics. Options - Model. - PowerPoint PPT Presentation
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Culvert Hydraulics
• Hydrotechnical Design Parameters• Channel Hydraulics• Culvert Hydraulics• Culvert Sizing
Culvert Hydraulics
Hydrotechnical Design Parameters
Culvert Hydraulics
•Area•Shape•Slope•Storage•Density•Vegetation•Soil Type•Initial Moisture
Culvert Hydraulics
200100502010521.251.051.00310
100
1000
Return Period (Years)
Dis
char
ge (c
ms)
Data
GEV
LN3
LP3
Options - Statistics
200100502010521.251.051.003100
1000
10000
Return Period (Years)
Dis
char
ge (c
ms)
LN3 - Without Ungauged Data
LN3 - With Ungauged Data
Gauges >30 Years (212)
0
1
2
3
4
5
0 100 200 300
Discharge (m3/s)
Stag
e (m
)
Culvert Hydraulics
Options - Model
0
20
40
60
80
100
120
0 50 100 150 200
Rainfall (mm)Ru
noff
(mm
)
Foothills
Swan Hills
Western Plains
Central Plains
SE Corner
50
100
200
400
Culvert HydraulicsStream Location Year Flow (cms) Stage (m) Stream Location Year Flow (cms) Stage (m)Oldman Lethbridge 1995 4700 8.5 N. Sask. Edmonton 1899 6000 13.0
1908 4500 8.3 1915 5800 12.81948 3500 7.5 1986 4500 11.61953 3100 7.1 1952 3750 10.82013 2400 6.3 2013 2800 9.5
Bow Calgary 1879 2250 4.5 Athabasca Athabasca 1954 5700 7.11897 2250 4.5 1944 5000 6.82013 1700 4.1 1971 4600 6.51902 1550 4.0 1986 4500 6.51932 1500 4.0 1980 4300 6.3
Red Deer Red Deer 1915 1900 6.6 Smoky Watino 1990 9400 10.42005 1500 5.9 1982 9200 10.21954 1500 5.9 1972 9000 10.02013 1300 5.5 1987 7100 8.71952 1250 5.4 1965 5500 7.6
Culvert Hydraulics
Culvert Hydraulics
Culvert Hydraulics
Culvert Hydraulics
Culvert Hydraulics
Component Governs % System
Channel Capacity Most channels > 80%
Historic HWM Large streams ~ 10%
Runoff Potential Small basins < 5%
Hydrotechnical Design Guidelines
Culvert Hydraulics
Channel Capacity
Culvert HydraulicsHistoric Highwater - AT
Culvert Hydraulics
0
40
80
120
160
200
Jun/18 Jun/19 Jun/20 Jun/21 Jun/22 Jun/23 Jun/24
Disc
harg
e (c
ms)
Alberta 'd' vs 'Tc' Observations - Rainfall
0
50
100
150
200
250
0 20 40 60 80 100Time to Centroid Of Hydrograph 'Tc' (Hours)
Run
off D
epth
'd' (
mm
)
05A&11A05B - F07A07B - G
Basin Runoff Potential
Culvert Hydraulics
Culvert Hydraulics
Culvert Hydraulics
Channel Hydraulics
Culvert Hydraulics
S
1
Y
V = 14 Y0.67 S0.4
Normal Flow
Culvert Hydraulics
B
h
T
Q = AV
Culvert Hydraulics
Culvert Hydraulics
S
1
1. Normal2. RVF
3. GVF
Other Flow Profile Cases
Culvert Hydraulics
S
1
EGL• EGL flows downhill• Head loss at RVF
E = Y + V2/2g
Culvert Hydraulics
Culvert Hydraulics
Culvert Hydraulics
Bridge
Culvert
Culvert Hydraulics
Culvert Hydraulics
98.0
99.0
100.0
101.0
102.0
103.0
104.0
105.0
020406080100120140160180200
Invert + Culvert
Energy Gradeline
Water Surface EL.
Top of Bank
Critical Depth
Normal Depth
RVF - ExpansionRVF - Contraction
Barrel – GVF +
D/S Channel - Normal
U/S Channel - GVF
Trans - AdverseTrans - Steep
Culvert Hydraulics
Culvert Hydraulics
Culvert Hydraulics
Culvert Hydraulics
Culvert Hydraulics
Culvert Sizing
Culvert HydraulicsSizing:• Complex – need model• Start :– Rise = burial + Y + headloss• Range - sizes, shapes, barrels, profiles• Parameters – V, freeboard/ponding• Practical – drift/ice, future lining
Culvert HydraulicsConsiderations:• Fish Passage• Blockage - Drift, Icing• End Protection Works (V)• Ponding:
- Upstream Flooding- Uplift Failure- Embankment Stability- Road Overtopping
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