Table of Contents
Methods for Evaluating Culverts for Fish Passage
Outline
Four Ways to Evaluate Culverts for Fish Passage
Observing Actual Fish Passage Success
Hydraulic Analysis (Mathematical modeling of flow in culverts.)
Velocity Measurements (Detailed measures/mapping of water velocity to find passable zones.)
Measurement of Surrogates (Measuring culvert gradient to estimate water velocities, etc.)
This Class will Focus on Measurement of Surrogates!
Introduction to Measurements
Accuracy, High and Low
Precision
Bias
Precision, Bias, and Accuracy (adapted from EPA 1996.)
Consider the Precision of Your Measurement vs. the Evaluation Criteria!
Take Home Point with Precision of Tools
Ensuring Accuracy and Precision of Measurements
Accuracy, precision and good protocols/methods ensure that you or someone else could perform the same set of measurements and come up with the same result: REPEATABILITY!!
Barrier Analysis Key
Barrier Evaluation Key 1
Barrier Evaluation Key 2
Culvert Evaluations
Step 1: Outlet Drops
Residual Pool Measurements
Residual Pool Measurements
Step 1: Outlet Drops (Jumping)
Outlet Drop Barrier Categories from Key 1
Step 2: Baffle/Weir Designs (Velocity, Jumping)
Step 2: Baffle/Weir Designs (Velocity, Jumping)
Step 2: Baffle/Weir Designs (Velocity, Jumping)
Step 3: Sediment Retention Patterns (Velocity) Full Retention
Sediment Retention Patterns Sparse Retention
Sediment Retention Barrier Categories from Key 1
Average Sediment Depth (pipe capacity losses)
Step 4: Backwatering (velocity)
Backwatered Conditions
Backwatered Conditions
Design of Manmade Downstream Weirs (Jumping)
Backwatering Barrier Categories from Key 1
Step 5: Culvert Gradient (Velocity)
Culvert Gradient Barrier Categories from Key1
Step 6: Inlet Drop (Velocity)
Step 6: Inlet Drop, con’t (Velocity)
Step 6, con’t: Channel Constriction (Velocity)
Step 6: Inlet drops and Channel Constrictions
Step 6, con’t: Channel Constriction (Velocity) Culvert Width/ Bankfull Width
Bankfull Width
Bankfull Width
Culvert Dimensions
Culvert Dimensions
Step 7: Water Depth (Submergence)
Step 7: Water Depth (Submergence)
Step 7: Water Depth (Submergence)
Step 7: Water Depth (Submergence)
Other Factors for Prioritization or Planning
Peak Flow Analysis
Peak Flow Analysis
Peak Flow Analysis, con’t
Channel Gradient
Channel Profile
Valley Fill Depth
Closing Remarks
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