Culvert Hydraulics Hydrotechnical Design Parameters Channel Hydraulics Culvert Hydraulics Culvert Sizing.

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Presentation transcript:

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 Options - Statistics Gauges >30 Years (212)

Culvert Hydraulics Options - Model

Culvert Hydraulics

ComponentGoverns% System Channel CapacityMost channels> 80% Historic HWMLarge streams~ 10% Runoff PotentialSmall basins< 5% Hydrotechnical Design Guidelines

Culvert Hydraulics Channel Capacity

Culvert Hydraulics Historic Highwater - AT

Culvert Hydraulics Basin Runoff Potential

Culvert Hydraulics

Channel Hydraulics

Culvert Hydraulics S 1 Y V = 14 Y 0.67 S 0.4 Normal Flow

Culvert Hydraulics B h T Q = AV

Culvert Hydraulics

S 1 1. Normal 2. RVF 3. GVF Other Flow Profile Cases

Culvert Hydraulics S 1 EGL EGL flows downhill Head loss at RVF E = Y + V 2 /2g

Culvert Hydraulics

Bridge Culvert

Culvert Hydraulics

RVF - Expansion RVF - Contraction Barrel – GVF + D/S Channel - Normal U/S Channel - GVF Trans - Adverse Trans - Steep

Culvert Hydraulics

Culvert Sizing

Culvert Hydraulics Sizing: Complex – need model Start :– Rise = burial + Y + headloss Range - sizes, shapes, barrels, profiles Parameters – V, freeboard/ponding Practical – drift/ice, future lining

Culvert Hydraulics Considerations: Fish Passage Blockage - Drift, Icing End Protection Works (V) Ponding: -Upstream Flooding -Uplift Failure -Embankment Stability -Road Overtopping