How Engineering Impacts More Than the Built Environment

The science of engineering is the backbone of the environment we construct around us, and many people perceive engineering in its most common ways. For example, both civil and structural applications are when engineers are most in the spotlight and is arguably the first thing people think about when considering what “engineering” means. These practice areas are often the most visible because they are physical and affect our daily lives as both participators in the built environment and also as members of society.

“I love being able to see a project come to life. It is quite a spectacular feeling to know I have helped bring someone’s idea into reality.”

Hailey Sibert – Otak Civil Designer

However, engineering can be much more varied than meets the eye, and the practice area is defined by the broader applications that a multidisciplinary approach can have on not only the built environment, but also on the communities that call that environment home.

In this post, we’ll explore the ways in which engineering affects multiple facets of society, and show just how important the intersectional practice is to fully functioning communities.

View of transportation design

Getting People Around, In Multiple Ways

Transportation engineering immediately comes to mind when thinking about the lesser thought applications of the profession. Options for transportation in the built environment don’t just spring up out of nowhere, and the impact that high functioning transportation infrastructure on communities is hard to overstate.

Quality transportation engineering improves how community members get from place to place and serves as a great socioeconomic equalizer. By increasing access to jobs, opportunities, and services through breaking down transportation barriers, engineering directly uplifts disadvantaged groups within municipalities by ensuring everyone gets an equal shot at getting there.

Multi-modal transportation also plays a role here. Communities don’t solely consist of cars, trains, and busses. Designing pedestrian-friendly areas allow neighborhoods to flourish and encourages healthier, more walkable lifestyles among citizens. Greater still, access between point A to point B is improved for those who do opt for public transport, which decreases reliance on cars. This means everything from sustainability perspective, and it’s all made possible through quality engineering that’s designed to move people, not just vehicles.

Using The Natural Flow of Things

The environmental intersections of engineering with purpose are also huge components of quality design. When we envision communities, we design with natural surroundings and not despite them. By doing this, we place an emphasis on low impact development (LID) which gives way to developing green stormwater infrastructure.

The best part about being a civil engineer is building connections. We building infrastructures and improve transportation networks that connect people and communities.

Eva Ho – Otak Civil Engineer

Without a multidisciplinary approach to this type of engineering, the greener aspects of project work may go unnoticed, or natural systems in place may be harmed or interrupted. Instead, engineers can design around habitats by understanding water flow and hydraulics of the site. In this way , water and natural resources engineers play a critical role in making communities not only sustainable for humans, but also more habitable for other forms of wildlife that may exist alongside something out of the built environment.

Helping the Rain Go Away

Quality water resources engineering also helps us answer unique questions about planning and design, including ones in relation to stormwater and surface water management. One might ask themselves, “When the rain falls, where does it go?”

The answer? It’s been engineered to flow through the community in helpful ways. For one, understanding water detention and retention prevents flooding for neighborhoods already in place. Second, it ensures quality of water for communities and natural habitats impacted by the local watershed and stormwater runoff — engineering for the community of life, not just for people.

“My [engineering] work has given me the opportunity to wear many different (hard) hats. I’ve designed cable stay bridges, a variety of buildings, sculptures… every day is an adventure!”

Greg Mines – Otak Structures Engineer

This ultimately helps prevent more vulnerable communities and areas from experiencing the effects of increased or harmful precipitation by injecting climate resiliency into the existing system, something a traditionally structural engineer might not consider. When multifaceted engineers are tasked with a project, they come up with a multi-pronged way of looking at a project that does more than just house, shelter, or get people to work on time.

Finding the Perfect Place for a Project

Engineering helps us answer even more pertinent questions about the built environment and our relationship with it, even before construction begins. So, just what happens on a site before we start building on it? Choosing the right spot to begin work involves a lot more than one would think.

Scrupulous engineering considers all the possibilities in order to find the right place for a project based on a goals and initial design, giving way to the practice of site development. Coming up with creative, practical, buildable, and permittable solutions is the work of engineers as well, and good ones are context sensitive (to cultural and natural resources that exist around a site) before building starts. Design efficiency has everything to do with pre-construction, from choice of materials to making sure things go smoothly from both a budget and site complications perspective. Engineering opens doors to deeper understanding of a project, not just the calculus to get it done, to ensure timely project delivery.

Enjoying Outdoor Spaces

As much impact as good engineering can have, sometimes the work is about leaving that impact with a minimal footprint. This can not only benefit clients, but members of the community that the project might impact. So much of engineering is about enhancing our open spaces and natural landscapes with low-profile infrastructure that allows for greater access and enjoyment from the populace, which can be as simple as a well-placed jungle gym or as complex as designing administrative facilities for parks and natural attractions.

Bike paths, multi-use paths, all of these are often not thought of as a crucial bit of engineering, however they double down on active transportation of the area while continuing to encourage a healthy lifestyle.

Trails and trailheads play a similar role — allowing people to access and connect with nature while preserving the spaces in which they exist and generating interest in the natural environment while in an effort to preserve it.

The thing I like most about working at Otak is the awesome, interdisciplinary team that I get to work with.

Chris Romeyn – Otak Sr. Water Resources Engineeer

And again, even before construction or the start of a project, feasibility studies in these environments also fall into the wheelhouse of engineering, ensuring the safety, sustainability, and resiliency of the site so people can enjoy it, catching problems in advance that might hinder project completion.

Multiple Engineering Disciplines, One Team

The work of engineers at Otak is multi-faceted and interdisciplinary, and we’re proud that our work goes toward the betterment of the communities we serve. The voices, experience and expertise of the engineering teams within our ranks reflects what their work means to them. Take a closer look at the depth and breadth of project work from one of our most esteemed and recognizable practice areas.

Kellogg Creek Bridge

A 120-foot replacement for the Kellogg Creek Bridge was needed after being compromised during extreme weather events. The clear span design solved flooding and scour issues from the creek beneath while also protecting a unique, pre-existing fish ladder.

A More Resilient Structure and Sustainable Aquatic Habitat

Because of significant structural issues caused by extreme weather events, Kellogg Creek Bridge included a fast-track approach for the procurement of the design-build team and required quick mobilization and efficiency to meet aggressive construction timeframes. Unusual hydraulics consisting of backwater from the Willamette River resulted in high flows in Kellogg Creek, causing significant scour. The design also enhanced the south bank below the bridge by adding woody debris for fish habitat along with rock revetment for bank stabilization. Otak was the lead design consultant, quality manger, and construction manager for Kellogg Creek Bridge, placing an emphasis on climate change resilience and the sustainability of aquatic habitats.

Riverton Creek Flap Gate Removal

To provide a more natural open discharge and eliminate a fish barrier from the outfall of Riverton Creek into the Duwamish River, associated flap gates and pipe culverts would need to be removed.

Improved Fish Passage and Pedestrian Bridge

Incorporated into the work was the design of a bridge to carry the Green River Trail over the new Riverton Creek channel. Improvements also include the removal of a portion of an existing concrete retaining wall and of retrofit an existing sheet pile wall that supports Pacific Highway South using soil anchors. Design of a new deep retaining wall supports a private parking lot. Included in stream enhancements was a focus on riparian plantings. In addition to executing the project, the Otak team led updates to previously provided reports and developing plan, specification and estimates (PS&E).

Issaquah Master Drainage Plan

With goals to improve public safety, reduce maintenance frequency, increase drainage system reliability, restore aquatic and riparian habitat, and improve water quality, the City of Issaquah sought to develop a surface and stormwater master plan (SSWMP). The plan develops a prioritized list of stormwater infrastructure and habitat restoration projects to be implemented within a 20-year timeframe, simultaneously helping the city many its grown while remaining compliant with NPDES permitting. The Otak team worked with the city to develop the plan and subsequent projects that would address the impacts of impaired surface water quality, aquatic and riparian habitat degradation, increased flooding, and aging infrastructure.

Cedar Crossing Restoration

In reconnecting Johnson Creek to its historic floodplain, the stream restoration plan provided flood storage for peak flow attenuation, and improved riverine and wetland habitats. Otak led the overall project management, geomorphic assessment, monitoring data interpretation, hydrologic analysis and hydraulic modeling, as well as the comprehensive restoration design.

Enhanced Habitats for Endangered Species

Working with the City of Portland Bureau of Environmental Services (BES), the Cedar Crossing Restoration enhanced native riparian vegetation and tree canopy, creating high-flow refugia for listed Endangered Species Act (ESA) species, particularly several ESA-listed salmonids. Overarching project elements involved demolition of structures, management of contaminated soil as well as a number of complex design, permitting and site preparation considerations. The stream restoration design included in-stream channel structures, bank stabilization, large woody debris structures and the removal of nearly 2,000 feet of a century-old WPA rock wall that lined both banks of the stream.

North Creek Channel Relocation

In restoring the natural morphology of North Creek, the channel was relocated to reconnected 3,800 feet of the stream to its associated 60 acres of wetlands. The restoration of native plant communities in the floodplain was also a focus in improving the habitat for both aquatic and terrestrial wildlife species.

Restoration to Natural State for An Improved Habitat and Open Space

As part of larger improvements to the campuses of University of Washington-Bothell and Cascade College (CC), the North Creek Channel relocation was designed alongside a regional trail and a boardwalk. The developed public open space features interpretive exhibits that extend out into the restored floodplain. In restoring this lowland portion of the site, the meander length, curve radius, bankfull depth, and width-to-depth ratio of North Creek were returned to its natural status. The Otak team based this design on historical information, regional references for similar streams, reference reaches both onsite and upstream.

Springwater Wetlands Restoration

The Springwater Wetlands Restoration project reconnects and restores the Johnson Creek floodplain while managing flooding by expanding on existing, historic wetlands. Similar to the adjacent Foster Floodplain Natural Area that preceded this work, the project also restores the wetland as a wildlife habitat and space for public access. Otak led the predesign research and worked iteratively with the City of Portland Bureau of Environmental Services (BES) and other stakeholders to meet a variety of goals throughout the permitting and design processes.

Enhancing a Wetland for Improved Habitat and Flood Mitigation

In addition to managing flooding through green stormwater infrastructure, the city aimed for broader benefits in restoring the Springwater Wetland, including the removal of contaminated fill and non-native species while enhancing habitat for native species such as the Red Legged Frog. An unsteady-state hydraulic model was used to evaluate flood storage capacity and develop hydraulic connections that convey flood flows to and from the wetlands. The modeling and hydrologic analysis was used to develop the Johnson Creek Restoration Plan that accounts for 10-year storm, 25-year flood, and 100-year flood events. Data gathered during modeling also informed the design of public access amenities, including the creative reuse of historic stonework as seating, new plaza areas, and architectural features throughout the site. Expanding the area’s use further, a dual-use trail system (that uses porous pavement to further reduce stormwater runoff) creates a safe, accessible connection to the Springwater Corridor Trail.

Spring Creek Pedestrian Bridge

Spring Creek Pedestrian Bridge is a 385-foot clear-span cable-stay structure over the Methow River. Its design incorporated historical context from the town with elements that reflect 19th Century steel construction. The main steel truss and towers were constructed of weathering steel and the deck planks were precast concrete while tower foundations were designed to accommodate significant scour potential. Otak was responsible for structural design, stream hydraulics, and construction staking in partnering with Mowat Construction for this $2.5 million design-build project.

Flood Reduction at South 180th Street

The flood reduction at South 180th aimed to address longstanding flooding issues in the area caused by a ditch with inadequate capacity. A critical areas assessment developed solutions focused on the goal of reducing flooding through flow control and additional conveyance capacity.

A Critical Area Assessment to Solve Persistent Flooding

Flooding at 180th would happen several times a year. An evaluation of flood risk to adjacent properties as well as capacity for the ditch and downstream drainage system delivered alternatives using both conventional or natural drainage systems. These alternatives considered factors such as construction cost, right-of-way availability, property acquisition, erosion in downstream ditches, and permitting requirements. Otak played a critical role in this project, providing project management, topographic survey, hydraulic and hydrologic modeling, and stakeholder engagement. The evaluation has the South 180th Flood Reduction project well-positioned to succeed in its mission to reduce flooding and protect the surrounding properties and community.

Smith and Bybee Natural Area Floodplain Management

An evaluation of options to manage hydrology in the Smith and Bybee Lakes complex led to the restoration of its connecting channel and subsequent mitigation of seepage found in an existing levee. The design adds capacity to the connection channel through excavation, allowing Metro to better manage water levels in the lakes. Otak led the hydraulic modeling of the system to compare the benefits derived from varying levels of channel excavation for the resulting restoration design as well as alternatives analysis of proposed remedies for the levee hazard mitigation design.

Levee Seepage Mitigation and a Restored Channel for Improved Hydrology Management

From the simulation of spring freshet floodplain functions to control of invasive species and habitat for migratory waterfowl, Metro manages water levels across the seasons in Smith and Bybee Lakes for a variety of objectives. A control structure was constructed in 2003 to aid in this management. However, the water levels in Smith Lake were not responding to control structure manipulations due to sedimentation and partial obstruction in the channel connecting Smith Lake to Bybee Lake. After comparing options, a design concept to excavate the channel and restore capacity was developed along with the construction documents. After construction, an inspection revealed seepage in the levee near the control structure and also identified burrowing animals which further increased a risk of levee failure. An alternatives analysis to resolve the issue led to a 200-foot-long sheet pile cutoff wall with segments on either side of the water control structure. With the piles driven 20-feet below ground surface, the design increases the sub-surface flow path to reduce seepage to minimal levels while providing a physical barrier that prevents animals from burrowing.