Fish Passage Design: Climate Resilience and Vulnerability

Julie Heilman, P.E.State Hydraulic Engineer

Fish Passage Design: Climate Resilience and Vulnerability

Design Goals:

• Accommodate the increased frequency of severe storms expected in the future as a result of a changing climate.

• Ensuring structure stability and functionality throughout the life of the asset.

2SR 121 Blooms Ditch, built 2016

Designing for Resiliency:

• Step 1: Design Methodology – (Stream Sim. or Bridge)

• Step 2: BFW vs 2-yr flow vs accommodating 100-yr flow

• Step 3: Evaluate Stream Dynamics• Step 4: Assess Site Vulnerability• Step 5: Design for Scour 500-yr flow

3SR 512 Jansen Creek, built 2016

Fish Passage Design: Climate Resilience and Vulnerability

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Fish Passage Design: Climate Resilience and Vulnerability

WSDOT vs WDFW:Trib to Tawes Creek Grovers Creek Olsen Creek Gribble Creek

Measured BFW (FT) 7.1 8.8 24 112040 predicted BWF (FT) 7.6 9.4 26.3 11.82080 predicted BFW (FT) 7.8 9.6 27 12.9

100-yr flow (CFS) 115 58.9 306 130500 -yr flow (cfs) 145 76.5 410 1772040 predicted flow (CFS) 136 73.8 351 1292080 predicted flow (CFS) 145 82.5 379 141

Stream-sim/bridge design (FT) 12 12.6 32 162040 Stream-sim/bridge design (FT) 11.1 13.3 34.7 172080 Stream-sim/bridge design (FT) 11.4 13.5 36 18

Final Structure Size (5 steps) 12-foot box culvert 13-foot box culvert 45-foot bridge 19-foot box culvert

Sheet1

Trib to Tawes CreekGrovers CreekOlsen CreekGribble Creek

Measured BFW (FT)7.18.82411

2040 predicted BWF (FT)7.69.426.311.8

2080 predicted BFW (FT)7.89.62712.9

100-yr flow (CFS)11558.9306130

500 -yr flow (cfs)14576.5410177

2040 predicted flow (CFS)13673.8351129

2080 predicted flow (CFS)14582.5379141

Stream-sim/bridge design (FT)1212.63216

2040 Stream-sim/bridge design (FT)11.113.334.717

2080 Stream-sim/bridge design (FT)11.413.53618

Final Structure Size (5 steps)12-foot box culvert13-foot box culvert45-foot bridge19-foot box culvert

SR 542 Anderson Creek Before

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SR 542 Anderson Creek After

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SR 542 Anderson Creek After

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Lake Creek Before8

Lake Creek After9

Lake Creek After10

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…you can’t design for everything.

Questions?

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…except Resiliency

Fish Passage Design: Climate Resilience and Vulnerability

Julie Heilman, P.E.State Hydraulic Engineer

QUESTIONS?

Fish Passage Design: �Climate Resilience and VulnerabilityFish Passage Design: �Climate Resilience and VulnerabilityDesigning for Resiliency:Fish Passage Design: �Climate Resilience and VulnerabilitySR 542 Anderson Creek BeforeSR 542 Anderson Creek AfterSR 542 Anderson Creek AfterLake Creek BeforeLake Creek AfterLake Creek After…you can’t design for everything.Questions?Fish Passage Design: �Climate Resilience and Vulnerability