Engineering Designs That SAVE SALMON

Key Concepts

• Salmon Recovery Projects
• Civil and Environmental Engineering Contributions
• Watershed-Scale Planning
• Water Quality Improvement
• Landscape Management
• Culvert Replacement
• Fish Passage Improvement
• Infrastructure Projects (Roadways, Bridges, Pipelines)
• Habitat Impact Mitigation

Types of Salmon Recovery Projects and Engineering Contributions

Salmon recovery efforts encompass a broad spectrum of projects, from large-scale watershed planning to highly specific infrastructure improvements. Civil and environmental engineers play a crucial role in these initiatives by applying their expertise to design, plan, and implement solutions that benefit salmon populations while also addressing other environmental and societal values.

Watershed-Scale Planning and Management

At the broadest level, engineers can be involved in watershed-scale planning efforts. These initiatives aim to improve overall water quality and enhance landscape management practices. This can involve:

• Water Quality Improvement: Developing strategies and implementing projects to reduce pollution, manage stormwater runoff, and restore natural hydrological processes within a watershed.
• Landscape Management: Advising on land-use practices that minimize negative impacts on aquatic ecosystems, such as erosion control, riparian zone restoration, and sustainable forestry or agricultural practices.

Specific Infrastructure Interventions

Engineers also contribute to more targeted projects, with culvert replacement being a common and critical example.

• Culvert Replacement for Fish Passage: A significant area of work involves replacing undersized, perched, or blocked culverts that impede salmon migration. These structures, often installed for roadways or other infrastructure, can create barriers to upstream and downstream movement, preventing salmon from accessing spawning grounds or foraging areas. Engineers design and implement replacements that ensure adequate flow, appropriate slope, and substrate to allow for unimpeded passage.

Overlap with Civil Engineering Infrastructure Projects

Civil engineers are inherently involved in projects that intersect with waterways, such as the construction and maintenance of roadways, bridges, and pipelines. These projects can have potential impacts on salmon habitat.

• Mitigating Impacts of Infrastructure: Civil engineers are tasked with designing and executing these infrastructure projects in a way that minimizes environmental harm. This includes:
  • Roadway and Bridge Crossings: Ensuring that bridges and culverts are designed to accommodate natural stream flows and fish passage, and that construction activities do not lead to excessive sedimentation or habitat degradation.
  • Pipeline Crossings: Planning and executing pipeline installations to avoid disrupting streambeds and riparian areas, and implementing measures to prevent leaks or spills that could contaminate water sources.

The core principle is to deliver necessary infrastructure projects for clients (municipalities, private entities) while consistently considering and prioritizing the environmental needs of salmon and their habitats. This involves integrating ecological considerations into the design and construction phases from the outset.