The True Cost of Turf Grass and Value of Native Landscapes

In large-scale development and urban planning, turf grass is often the “default” for its low installation cost. But if we look at the lifecycle of a project, that green carpet quickly shifts from an asset to a significant operational liability.

Infographic showing the hidden costs of turf grass and growing benefits of native landscapes.

Taking this long-term outlook often not only realizes an economic cost but practical and environmental ones as well. Increasingly landscape architects are finding better design solutions by looking no further than what already surrounds them.

In this blog we’ll dive into these hidden costs of turf grass and how native landscapes are creating lasting value in resilient communities.

What is Turf Grass?

The use of turf grass in landscape architecture involves the placement of sod to quickly implement a controlled aesthetic.

What are Native Landscapes?

Native landscapes are designed to match the natural surroundings of a given area. This approach involves native plantings from the region that respond and thrive within that climate and conditions.

The Financial Reality of Turf Grass: 10-Year Operational Costs

Long has turf grass been used in the landscape for its fast implementation and immediate finished appearance. It’s also cheaper, at least at first glance.

While sod is one of the least expensive groundcovers to install, it becomes the most expensive to maintain and one of the heaviest environmental burdens. The reality is that these savings evaporate quickly when looking at the lifecycle of the project.

There are some key ways the long-term costs of turf grass take shape.

A person laying turf grass sod on the ground.

Maintenance Scaling

Over a 10-year period, the cost of maintaining traditional turf grass can be up to 7x higher than native landscaping. For multifamily developers and homeowners’ associations, this directly impacts the Net Operating Income (NOI) and HOA dues, respectively.

Labor Inflation

Turf grass requires weekly human intervention. In a tightening labor market, reducing high-frequency maintenance tasks is a strategic move for municipal budgets and property management firms.

The Environmental Strain

In many urban areas, 30–60% of municipal fresh water is diverted to landscape irrigation. For city administrators, turf grass represents a massive strain on local water infrastructure.

Chemical Runoff

Large-scale turf grass management often involves 10 times more pesticides and fertilizers per acre than industrial farming. This creates significant nitrogen loading in local watersheds and drainage systems.

Desired Outcomes for Turf Grass

The choice between turf grass and native landscapes is almost always a balance between design control and practical accessibility. What is the desired aesthetic and what are the functional needs from a maintenance community use standpoint?

For areas that need to be easily accessible as well as those that serve a specific purpose, such as a sports field, the use of turf grass is clearly the best option.

The Growing Application of Native Landscapes: Long Term Benefits

With a better understanding of low impact design and appreciation for natural features, there is a growing shift in the application of native landscapes in landscape architecture across a variety of applications. Forward-thinking developers are moving away from the “lawn-only” model toward high-performance landscapes.

The Break-Even Point

While native meadows or drought-tolerant landscaping may require a higher upfront investment in design and planting, the ROI is typically realized within 4–7 years through the elimination of constant mowing, chemical treatments, and irrigation repairs.

Stormwater Management

Native plants have deep root systems that improve soil infiltration, reducing the need for costly grey infrastructure and drainage systems. They are often an integral part of green stormwater infrastructure.

Aesthetics

Modern tenants and residents value “wild” spaces and biodiversity over sterile lawns. Native landscapes provide a unique aesthetic that differentiates a property in a crowded market.

Sustainability Certification

Motivated by many things from marketability to resource efficiency, the pursuit of various sustainability certifications take into account a variety of project elements. Use of native landscaping can be a significant contributor towards reaching the necessary thresholds of those rating systems.

Carbon Footprint

Gas-powered commercial mowing equipment is a major local pollutant. Shifting to “no-mow” or native zones helps cities and developers meet aggressive carbon-neutral goals and ESG requirements.

Native landscapes are a valuable asset for a region’s biodiversity. Often involving native flowering plants, these areas can be an essential resource for pollinators that are becoming increasingly scarce. This is especially true in urban environments.

Desired Outcomes for Native Landscapes

Across the wide breadth of landscape architecture desired outcomes on projects, the vast majority present opportunities to utilize the flexibility of native landscapes. Each instance involves (and requires) consideration of species that do well in the region to realize the benefits, often allowing a degree of creativity and customization.

These applications can vary greatly in size, from a small green stormwater feature to larger natural areas. The aforementioned sustainability rating frameworks also present a natural opportunity, and compounding benefit, of adding native landscapes to designs.

The Bottom Line

Continuing to default to turf grass is a choice to commit to indefinite high-cost maintenance and environmental degradation. Whether managing a city’s park budget or a developer’s long-term portfolio, consideration of native landscapes prioritizes resilience while simultaneously avoiding the “low-cost” installation trap.

Innovative Green Stormwater Infrastructure Named Project of the Year at 2026 APWA WA

Group photo of the Monroe Ave Stormwater Facility team with Project of the Year awards from APWA WA.
The Monroe Ave Stormwater Facility project team during the 2026 APWA WA awards event.

  Implementing an innovative approach to urban stormwater management, the Monroe Avenue Infiltration Facility was recognized with two Project of the Year awards at the 2026 American Public Works Association (APWA) Awards for Washington state.

  • Project of the Year: Environment ($5–$25 Million)
  • Project of the Year: Sustainability – Envision Award

With a mission of creating an engaged community of AEC professionals, the APWA is a national organization dedicated to advancing public works at the local level. These honors follow a presentation the 2025 event, together highlighting a design aimed at solving long-standing flooding and environmental challenges for communities around the Renton Highlands Watershed. Projects of the Year showcase excellence and innovation in the management and administration of public works, while the Envision Award specifically focuses on an industry-leading example in sustainable, resilient, and equitable civil infrastructure.

Visualization of the Monroe Avenue Stormwater Facility.
Visualization of the Monroe Avenue Stormwater Facility

About the Monroe Avenue Stormwater Facility

For decades, persistent flooding caused issues for communities around Renton, Washington. The Monroe Avenue Stormwater Facility took a comprehensive approach to reduce flooding while also enhancing water quality for this growing area. The complex design connects a variety of green stormwater features with existing stormwater infrastructure.

Using a treatment train approach that directs flows through a nature-based treatment system, polluted stormwater runoff is filtered and cooled before making its way back into the local river system. A combination of surveying along with hydrologic and hydraulic modeling of the subbasin optimized the facility to protect these communities from 100-year storm events.

 

 

The Monroe Avenue Stormwater Facility project team accepting Project of the Year awards during APWA WA 2026 event.
People at the Otak booth during the 2026 APWA WA event.

 

 

 

 

Complete Streets: How Policy and Design Shape Urban Mobility

Communities thrive with greater connectivity. When this includes a multimodal approach that’s designed to accommodate users of all ages and abilities, it can be referred to as complete streets. The concept redefines the design of roadways to support a more holistic view of mobility, shifting from vehicle dominated corridors to spaces that serve everyone.

Complete streets are uniquely positioned to meet multiple goals at once. Increased public accessibility unlocks opportunities for economic growth, enhanced infrastructure, and improved public health. It not only promotes sustainability with active transportation and green infrastructure but also improvements for motorists with safety and traffic calming features.

Graphic introducing the topic of complete streets.

Comprehensive in nature, a complete streets policy can also be complex in its implementation. Each community has its own needs, constraints, and priorities, meaning complete streets must be thoughtfully tailored to their context.

In this blog, we’ll explore what complete streets are, the common elements that make them effective, and the process of creating policies leading to projects that bring them to life.

What Are Complete Streets?

Complete streets are an approach to planning, designing, building, operating, and maintaining streets that enable safe access for people of all ages and abilities. Rather than focusing primarily on vehicular traffic, this approach considers how all users interact within the transportation network to increase efficiency throughout.

At its core, complete streets emphasize multimodal transportation. This means integrating infrastructure for pedestrians, cyclists, transit users, and motorists while also adding improvements to infrastructure like stormwater management. The goal is to create streets that are not only functional but also inviting and efficient, improving both mobility and overall environment within a corridor.

Examples of Complete Streets Design Features

Complete streets incorporate a variety of design features that work together to improve access to businesses, essential services, and public spaces. This often leads to comprehensive improvements along a corridor impacting multiple aspects of public infrastructure.

Tualatin Moving Forward Transportation Bond

Aerial view of an intersection along the Boones Ferry Corridor.

Boones Ferry Corridor Improvements

A two-mile corridor is improved with practical, cost-effective solutions that enhance bike and pedestrian access.

Image of the completed redesign of the Martinazzi Avenue intersection as part of the Tualatin Moving Forward Bond Program.

Martinazzi & Sagert Intersection

Increased traffic capacity is combined with protected bike lanes and widened sidewalks as part of improved overall operations.

View of a pedestrian crosswalk and landscape as part of pedestrian safety improvements around Tualatin Elementary.

Tualatin School Pedestrian Improvements

Removal of barriers to students biking and walking to Tualatin Elementary also reduces roadway congestion in the area to improve safe routes to school.

The Sandalwood Swale from the adjacent sidewalk with signage describing the water quality facility.

Sandalwood Swale

To account for added impervious surfaces across the Tualatin Moving Forward Bond Program, a vegetated swale is designed to treat stormwater in the area with green infrastructure.

Roadways

Roadways can often be barriers to broader accessibility. While complete streets place less priority on a community’s vehicular traffic, improving roadways for their use is no less important. Taking a wider perspective, the design often seeks to reduce overreliance on cars, improving safety and traffic for everyone in the area.

Features such as wider shoulders, curb extensions, and roundabouts are commonly used to calm traffic and reduce speeds. These elements enhance safety for both drivers and pedestrians while maintaining efficient road diets. The result is a roadway that’s safer and more integrated with other modes of transportation, removing barriers for all.

Sidewalks, Bike Lanes, and Multiuse Paths

Active transportation infrastructure is a defining feature of complete streets. Sidewalks, bike lanes, and multiuse paths are designed to create safe and convenient options for people who walk, bike, or use growing forms of micromobility.

Municipal policies often guide these features, such as requiring sidewalks of a certain width along new developments. Increasingly, designers must also account for emerging transportation modes like e-bikes and e-scooters, as well as designated spaces for rideshare services that do not disrupt traffic flow. These improvements benefit local businesses by increasing accessibility and walkability. When people can reach shops and services without a car, it expands the customer base and enhances the overall experience of an area.

Accessibility is essential to this goal. Features like pedestrian bridges, median islands, and well-marked crosswalks with updated signals help ensure that streets are safe and usable for individuals of all abilities.

Transit Stops and Bus Lanes

Public transit plays a vital role in complete streets. Integrating transit options such as bus rapid transit or light rail helps reduce congestion and provides reliable alternatives to driving.

Dedicated bus lanes can improve efficiency by allowing transit vehicles to bypass traffic, making service faster and more predictable. Equally important are the transit stops themselves. Comfortable, accessible, and well-designed waiting areas can significantly improve user experience and encourage more people to use mass transit. Providing adequate space for waiting passengers, along with amenities like seating and shelter, contributes to a more welcoming and functional system.

Stormwater Infrastructure

While it may not be the first thing that comes to mind with transportation, stormwater infrastructure can be one of the most important features. As with any roadway, complete streets must effectively manage water runoff, especially as these new developments can increase impervious surfaces, or change existing conditions.

These requirements can lead to opportunities to integrate green stormwater infrastructure solutions. A nature-based design approach may use features such as vegetated swales and rain gardens to not only manage water efficiently and with low impact, but also to enhance the environment of a corridor.

Parks and Green Space

Complete streets often connect to parks, trails, and other recreational areas, expanding their reach and usefulness. By linking neighborhoods to regional trail systems, these projects can improve mobility across larger areas.

Green spaces add recreational value while also supporting environmental functions like stormwater management. Amenities such as bike racks, benches, and open spaces create new opportunities for alternative transportation and outdoor community activity.

Creating a Complete Streets Policy

Implementation of a complete streets design begins with a complete streets policy. This process, which can often take shape through comprehensive planning, establishes a framework for how streets will be planned and designed, ensuring consistency and alignment with community goals.

Because every community is different, policies must be flexible and context-sensitive, reflecting local priorities and conditions. There are several essential elements to that effort.

Build a Team of Stakeholders

A successful complete streets initiative begins with assembling a diverse group of stakeholders. This often includes neighborhood organizations, government agencies, elected officials, public safety advocates, business groups, and design professionals.

Property owners are especially important to be involved, as they may be directly impacted by changes. Early collaboration helps identify concerns, build consensus, and create a shared vision for the project.

Align Regulation and Requirements

Regulations can play a significant role in shaping complete streets policies. Municipalities might require a minimum sidewalk width around redevelopment or have a Vision Zero policy directed at eliminating transportation related injury and deaths.

These requirements can not only guide design decisions but also be used to advance complete streets initiatives that enhance safety. Shifting responsibility toward system designers, such as engineers and policymakers, the focus moves to safe speeds, forgiving infrastructure, and equitable, data-driven actions, rather than relying solely on individual behavior.

Identify Deficiencies and Opportunities

From an engineering perspective, the design process begins with evaluating existing conditions. Identifying gaps, from missing sidewalks and inadequate transit stops to a lack of bike infrastructure, helps define priorities and opportunities for improvement.

Designers must also account for constraints like existing utilities, walls, and right-of-way limitations. Traffic data and modeling can inform decisions about lane configurations, including opportunities for road diets or additional capacity where needed.

Community Engagement

Engaging the community is essential to creating successful complete streets. Public input helps identify desired features, anticipate how spaces will be used, and build support for the project.

Engagement can range from working with key stakeholders to broader public outreach efforts. Ultimately, incorporating community feedback ensures that the final design reflects the needs and values of the people it serves.

A Multidisciplinary Approach to Complete Streets and Vibrant Communities

Complete streets represent a shift toward safer, more connected, and sustainable transportation systems. They’re designed to safely accommodate pedestrians, cyclists, transit users, and motorists by integrating multimodal infrastructure, accessibility features, green spaces, and stormwater management. With thoughtful policies formed through a diverse set of stakeholders, these solutions are tailored to each meet the local needs of a community.

The approach ultimately helps foster neighborhoods where people of all abilities benefit from more vibrant, functional, and inviting environments for generations into the future.

Stormwater and Transit Designs Earn ACEC WA 2026 Engineering Excellence Awards

Images of the Monroe Ave Stormwater Facility team and Swift Bus Rapid Transit team at the 2026 ACEC WA awards event.
The Monroe Ave Stormwater Facility team [right] and Swift Bus Rapid Transit team [left] at the 2026 ACEC WA awards event.
As major enhancements to their communities, two Otak projects were honored at the 2026 American Council of Engineering Companies (ACEC) WA awards ceremony for making a positive impact in distinctly different ways. The Monroe Avenue Stormwater Facility earned a Gold Award for its innovative application of techniques to deliver a unique piece of green stormwater infrastructure while the Swift Bus Rapid Transit Orange Line earned a Silver Award for its social, economic, and sustainable design.

As an organization committed to advancing the industry, ACEC holds the annual awards to recognize engineering firms for projects that demonstrate an exceptional degree of innovation, complexity, achievement, and value. A closer look at these two projects, adding to a list of award-winning work, and their impact on surrounding communities can be found below.

Monroe Avenue Stormwater Facility – Gold Award: Uniqueness and/or Innovative Application of New or Existing Techniques

The Monroe Avenue Stormwater Treatment and Infiltration Facility represents a breakthrough in urban stormwater management and a model for engineering innovation solving long-standing environmental, flooding, and community space challenges within highly developed basins.

Located in the 260-acre Renton Highlands watershed, the project replaced an outdated infiltration pit with a facility designed to manage 100-year storm events, improve water quality, and deliver lasting public benefits. Among its most innovative elements is a multi-layered sediment and pollutant removal ‘treatment train’ engineered to preserve the infiltration capacity of the native soils. Altogether, the project will reduce flooding and improve water quality in the City of Renton for generations to come.

Swift Bus Rapid Transit, Orange Line – Silver Award: Social, Economic, and Sustainable Design

Adding to the state’s first rapid transit system of its kind, the Swift BRT Orange Line is an 11-mile connection between multiple communities in Snohomish County. This expansion of public transportation enhances accessibility for the region’s residents to a variety of vital services as well as economic and social opportunities.

Two Otak Projects Recognized at ACEC OR 2026 Awards

Group photos of the Upper Kellogg Creek and 1st and Strand project teams at the 2026 ACEC awards.
The Upper Kellogg Creek project team [left] and 1st and Strand project team [right] at the 2026 ACEC OR awards.
Multidisciplinary, multi-phase expertise was recognized at this year’s ACEC Oregon awards, with two Otak projects earning honors from the American Council of Engineering Companies Oregon Chapter. Work to reduce flooding by adding green stormwater infrastructure in a unique neighborhood setting was highlighted with a Small Project Award for the Upper Kellogg Creek Capital Improvements, while an Honor Award for the design and planning around 1st and Strand showcased upgrades aimed at growing the downtown waterfront of St. Helens, Oregon.

As an organization committed to advancing the industry, ACEC holds the annual awards to recognize engineering firms for projects that demonstrate an exceptional degree of innovation, complexity, achievement, and value. A closer look at these two projects, adding to a list of award-winning work, and their impact on surrounding communities can be found below.

Upper Kellogg Stormwater Management & Capital Improvements – Small Project Award

With a unique application of green stormwater infrastructure in a residential neighborhood setting, work on Upper Kellogg Creek addressed chronic flooding for the surrounding community while also enhancing its natural habitat. Initial capital improvement planning led to a design that connects a restored stream with an updated roadway stormwater system to eliminate the frequency of flooding issues during storm events.

1st and Strand: St. Helens Waterfront – Honor Award

Transforming an old mill site into a walkable, multimodal public space that sets up the downtown St. Helens waterfront for future growth was the basis of a planning effort and subsequent transportation design for the area. A new multiuse path and roundabout along with the added ability to close off a portion of the street for festivals reduces congestion in the area, supporting public use and continued economic growth.

Public Introduced to a Daylighted Stream that Supports Habitat and Community Growth

Project stakeholders during the ribbon cutting ceremony for the restored Miller Creek.
Otak project lead, Russ Gaston (far right), during the Miller Creek Restoration ribbon cutting ceremony

A collaborative effort between multiple municipalities and a multidisciplinary Otak team reached a significant milestone last week with a ribbon cutting ceremony at Miller Creek. Stakeholders from Port of Seattle, the Cities of Burien, and SeaTac, gathered alongside project leads to celebrate the completion of 1.4-acres of restored floodplain designed to enhance habitat for endangered salmon and reduce flooding for the surrounding community.

The project is just one piece of the Northeast Redevelopment Area (NERA) where master planning set a vision for economic development near the growing regional airport. In addition to the green stormwater infrastructure and environmental enhancements, the design also opened the area to greater public recreation with access to the regional trail system.

About the Miller Creek Restoration

To support redevelopment of a 162-acre subarea near the expanding SeaTac International Airport, the restoration of Miller Creek improved stormwater capacity, natural habitat, and public use. By daylighting 900 linear feet of a stream that previously flowed through a failing pipe system, the project also adds protection for private property and downstream wetlands from runoff. The restored stream will now also provide important natural habitat for endangered salmon and other aquatic species by bringing it to the surface and removing other barriers to fish passage. These efforts contribute to broader efforts to restore the Puget Sound Watershed.

One of several stakeholders speaking during the ribbon cutting event of Miller Creek.
One of several stakeholders speaking during the ribbon cutting event for the restored Miller Creek.
People walking along the Miller Creek Trail.
People walking along the Miller Creek Trail on a guided tour during its ribbon cutting event.
Developed plan, permitted, and oversaw construction
Graphic with information on this green stormwater infrastructure and it’s place in the natural hydrologic process.

Two Otak ‘Project of the Year’ Awards at APWA OR 2025 Fall Conference

Image introducing the 2025 APWA OR Project of the Year Awards.

The 2025 American Public Works Association (APWA) OR Fall Conference included two presentations by Otak experts and two more award-winning projects for the firm. Project of the Year honors highlighted the transportation design of 1st and Strand and the environmental design for the Springwater Wetland Restoration.

In addition to the accolades, a panel with water resources team leader Phil Kenyon focused on strategies that streamline collaboration between operations and engineering on projects while civil engineer team leader Keith Buisman shared an in-depth look at the design behind the award-winning 1st and Strand project. These sessions were followed by a wine tasting event where all proceeds went toward supporting the APWA Oregon Scholastic Foundation, advancing education opportunities in the industry.

Altogether, this year’s event followed a theme of “Public Works Unmasked.” It placed an emphasis on the details behind the work and ideas that were shared across the event’s activities. A closer look at the two Project of the Year winners can be found below.  

Graphic showing the 1st and Strand project team and project site after winning APWA OR Project of the Year.About 1st and Strand – Project of the Year (Transportation Category: $5 million – $25 million)

Situated along the downtown waterfront, work at 1st and Strand set up the City of St. Helens for continued growth. An initial planning effort was  followed by a transportation design that clearly defines this downtown core, both with infrastructure for growing business in the area and enhancing its use for the community.

Adjacent to City Hall and other public buildings, the streetscape design allows the area to host public events without disrupting traffic. The enhancements improve congestion, parking, and pedestrian access while also extending utilities that create shovel-ready sites for future development.

 

 
 

 

Graphic showing the Springwater Wetlands project team and project site after winning APWA OR Project of the Year.About the Springwater Wetlands Restoration – Project of the Year (Environmental Category: $5 million – $25 million)

 
A reconnected floodplain was designed to improve flooding for the City of Portland with the restored Springwater Wetlands. This extensive example of green stormwater infrastructure in an urban environment also adds a natural area for natural habitat and public access with connection a regional trail system.
 
The project was informed by complex hydraulic modeling and environmental science to account for historic flooding events. Data from those studies were also used in designing public access amenities and several other community-focused features found throughout the site.
 
 
 
 
 
 
 
 
 
 
 

Presenting a Large-Scale Approach to Water Quality at APWA WA 2025

Graphic introducing APWA Conference speakers with construction images of the Monroe Ave Infiltration Facility.

Showcasing the details behind one of the largest water treatment facilities in Washington State, a presentation at the American Public Works Association (APWA) WA 2025 Fall Conference on the Monroe Avenue Infiltration Facility included insights from two Otak engineers responsible for its design. Led by representatives from the City of Renton (project client), the presentation gave an in-depth look at the project’s background, the alternatives considered, and how it ultimately will enhance water quality and flood mitigation for the surrounding community.

Project leaders Russ Gaston and Joe Brascher were on-hand for a Q&A that followed to give firsthand accounts of what went into the design and environmental science that made the project possible. This session was open to the sold-out gathering of attendees for the annual APWA WA event. The group forms a large, dynamic, and engaged community of professionals dedicated to advancing improvement goals at the local level. In addition to opportunities like this to share innovative infrastructure examples with peers, the occasion also aims to foster professional growth and facilitate meaningful connections that promote excellence in the industry. Learn more about this example of green stormwater infrastructure that was presented below.

About the Monroe Avenue Infiltration Facility

Stormwater retention area surrounded by native plantings as part of the Monroe Avenue infiltration facility.
The Monroe Avenue Infiltration Facility

Over the previous few decades, the community of Renton, Washington experienced multiple historic flooding events, causing damage to property and infrastructure. These consequences also extended to the Cedar River and broader water quality in the area. Temporary solutions with drainage easements and overflow pipes were implemented over the years but a new approach was needed for managing stormwater runoff for the 260-acre subbasin. As a result, the city made plans for additional stormwater infrastructure to address the issue that would become the Monroe Avenue Infiltration Facility.

With an emphasis on water quality targets, long-term performance, as well as construction and maintenance cost, several alternatives were considered leading up to this project. Using hydrologic and hydraulic modeling, estimated peak flows were incorporated across all the designs to account for everything up to a 100-year storm event.

The selected alternative delivered a final design that balances cost efficiency and low maintenance with maximum water quality and a smaller facility footprint. The 14-acre site where the facility exists was originally a permitted sand and gravel pit from 1962 to 1982 and had since been used as a reclamation site. After extensive work with land rights, funding, and material availability, a storm tech chamber infiltration facility and water quality treatment vault would be the main components of what now exists at the location.

With a connection to existing stormwater infrastructure, the Monroe Avenue Infiltration facility includes a flow splitter along with primary and secondary isolator rows to address normal and high flow situations. A pretreatment removes debris and a bioscape unit within the treatment vault enhances water quality and lowers water temperature as it makes its way back into the water system. Designed with longevity and maintenance in mind, easy access to features for upkeep include a hammerhead access road to allow vactor truck turnarounds. Altogether the final product was constructed four months ahead of schedule.

A speaker from the City of Renton at the APWA WA 2025 Conference.
A speaker from the City of Renton at the APWA WA 2025 Conference.
A speaker from the City of Renton at the APWA WA 2025 Conference.
A speaker from the City of Renton at the APWA WA 2025 Conference.
Visualization of underground features of the Monroe Avenue Infiltration Facility.
Visualization of underground features of the Monroe Avenue Infiltration Facility.
Visualization of the Monroe Avenue Infiltration Facility and its bioscape feature.
Visualization of the Monroe Avenue Infiltration Facility and its bioscape feature.

Two Industry Events Focus on Different Approaches to Stormwater Management

Amy Murdick presenting at the 2025 CASFM conference.
Amy Murdick presents at the 2025 CASFM event in Steamboat Springs, Colorado

As part of a continuous effort to collaborate with industry peers and advance the water resources field, two of our team leaders recently presented at separate conferences focused on stormwater planning and management.

Taking place in Oregon and Colorado, the events covered the nuances found in each region while also representing the geographic reach of our work. Together they shed light on best practices that not only improve local environments but also the impact of work on communities through features like green stormwater infrastructure.

Below is an overview of the events, with a look at the organizations that made them possible and the topics our experts shared.

Sustainable Stormwater Symposium: Portland, Oregon

Achieving Retention without Requiring it: An Alternative to Oregon’s Numeric Stormwater Retention Requirement

Graphic introducing Trista Kobluskie's presentation at the 2025 Sustainable Stormwater Symposium.

With the stated goal of advancing the science and profession of engineering to “enhance the welfare of humanity,” the Environmental Water Resources Group (EWRG) hosted the Sustainable Stormwater Symposium in Portland, Oregon. The group is a subsidiary of the American Society of Engineers, and this bi-annual gathering is their flagship event.

“Using a consistent set of standards, we wanted to show how a team of stormwater engineers, scientists, and policy experts can creatively and practically address regulatory mandates for clients.”

– Trista Kobluskie, Stormwater Group Leader

In tandem with Clackamas Water Environment Services (WES), our group leader of water and natural resources, Trista Kobluskie, presented at this year’s symposium. The joint presentation highlighted different paths to positive environmental outcomes. The two presented a study that compared pre-development retention over a large area to the effects of WES’s approach, which discharges runoff through green infrastructure while targeting natural or pre-development hydrology.

A modeling exercise and policy analysis demonstrated to those in attendance how WES’s stormwater standards lead to positive results, even though they don’t necessarily align with the preferred Numeric Stormwater Retention Requirement approach by the Department of Environmental Quality (DEQ). Much of the discussion focused on how to demonstrate that infiltration is often achieved even when it is not required by emphasizing green infrastructure as a preferred strategy in design requirements.

Colorado Association of Stormwater and Floodplain Managers (CASFM) Annual Conference: Steamboat Springs, Colorado

What to Expect with the Unexpected: Benefits and Challenges to Implementing Adaptive Management

Graphic introducing Amy Murdick's presentation at the 2025 CASFM conference.

Comprised of professionals involved in floodplain and stormwater management, water quality, flood hazard mitigation, and flood preparedness, the Colorado Association of Stormwater and Floodplain Managers (CASFM) has a primary mission of reducing “the loss of human life and property from flood and storm damage.” With more than 1,000 members, the organization recently held their biannual meeting in Steamboat Springs, Colorado.

Among the topics covered at this year’s event was the growing practice of adaptive management, or the continued monitoring of a project site after completion to better understand its true impact over time. Along with our Colorado stormwater lead Amy Murdick, the panel included representatives from The Town of Parker, Naranjo Civil Constructors, The Mile High Flood District, and ERO Resources Corporation.

The group’s discussion covered the process of adaptive management which aims to provide a structured approach to decision-making that’s informed by science. They also dived into the benefits and challenges of the growing practice, emphasizing its place in better managing uncertainty, increasing resilience, and improving overall project outcomes.

 

 

 

A Guide to Green Stormwater Infrastructure and the Growing Benefits of Nature-Based Solutions

As urban environments and their infrastructure expand, so do the amount of impervious surface they create. Where rainwater would otherwise naturally find its way into the soil, those surfaces make it so that it is now prevented and diverted by hardened and water-resistant surfaces such as roadways, parking lots, and rooftops. Stormwater planning addresses this issue.

Infographic with features and benefits of green stormwater infrastructure (GSI).

Traditionally, “gray infrastructure” like sewer systems is designed with a single purpose: move water from one place to another as quickly as possible. Over time this approach has led to increasing issues with flooding, erosion, and pollution to local waterways. In response, green stormwater infrastructure (GSI) has risen in popularity to better manage stormwater by utilizing the natural functions of soil and plants.

In this blog we’ll discuss how, by blending nature-based solutions into infrastructure, communities find multiple benefits. Green stormwater infrastructure not only improves the immediate management of runoff but also the long-term resilience of their design.

Read on, or skip ahead:

What is Green Stormwater Infrastructure?

Green stormwater infrastructure (GSI) refers to systems that utilize the inherent qualities of nature-based solutions to improve the management and treatment runoff. Unlike gray infrastructure that consists of only man-made materials such as concrete or steel and is engineered solely to move water, GSI incorporates features that better slow, retain, and filter stormwater through natural processes.

Often involving planting vegetation, reconnecting natural water systems, or using permeable materials, green stormwater infrastructure is designed to replicate the natural hydrological processes by enabling infiltration below ground and evapotranspiration above. This approach treats rainwater as the resource it is rather than as waste while improving flooding, water quality, and a variety of other community benefits that come with a greener environment.

Benefits of Green Infrastructure and Nature-Based Solutions

The advantages of green stormwater infrastructure extend across environmental, social, and economic factors. Aside from obvious benefits to community flooding and natural habitat, this approach is also often more cost effective.

Adding green features, sometimes through the comprehensive planning process, to urban environments also can have wide-ranging positive effects on both quality of life as well as property values for a community where present. In fact, research has shown that properties near green stormwater features can increase in value by around 11%, reflecting the demand for communities that integrate green spaces into daily life.

Below is a quick overview of some of the primary benefits of green stormwater infrastructure for a community.

Flood Control and Water Quality

One of the most pressing challenges in stormwater management is flooding. Gray infrastructure often only shifts the problem from one place to another, channeling water away until systems overflow. By contrast, green infrastructure captures rainfall close to where it falls or diverts it to an area designed to naturally hold and absorb. The natural process of infiltration helps remove pollutants while slowly releasing runoff into groundwater. This reduces the burden on sewers, minimizes the risk of downstream flooding, and prevents the high percentage of pollution caused by untreated runoff entering rivers and lakes.

Air Quality and Heat Mitigation

Urban areas with large amounts of pavement experience the “urban heat island effect,” where temperatures rise due to absorbed and reflected heat. Higher temperatures also worsen air quality by increasing smog levels, posing risks to human health. It’s no secret that vegetation naturally converts CO2 into oxygen, which has a direct impact on improving air quality and reducing greenhouse gases. Drawing on these inherent characteristics, green infrastructure features help counter the urban heat island effect by reducing the amount of reflected heat by shading surfaces, filtering pollutants, and cooling the air through evapotranspiration.

Improved Natural Habitat

Even small green features can have a large impact on natural habitat. Projects that restore streams, reconnect wetlands, or replace outdated culverts not only manage stormwater more effectively but also improve fish passage (along with that of other aquatic organisms) and natural habitat for a variety of species. At the same time small additions of vegetation and tree cover provide homes for birds, insects, and small mammals. Together, these systems contribute to biodiversity and improve the resilience of communities.

Resource and Energy Savings

Green infrastructure also saves resources and lowers energy costs. For instance, green roofs insulate buildings, reducing heating and cooling expenses by up to 12%, while also lasting twice as long (20 versus 40 years on average) as conventional roofs. Permeable pavements help water reach soil and infiltrate. Altogether, these systems reduce embodied carbon footprints, extend infrastructure lifespans, and minimize long-term maintenance burdens.

Green Infrastructure Examples

Green infrastructure takes many forms that are tailored to the site and community needs. Below are some common examples of nature-based solutions in action:

Rain Garden

Rain gardens are shallow depressions planted with vegetation designed to capture runoff from nearby impervious surfaces. They filter pollutants, recharge groundwater, and provide habitat for wildlife such as birds and pollinators.

Green Roof

In an urban environment, rooftops are one of the most prevalent impervious surfaces. A green roof transforms that surface of a building into a living landscape. By covering rooftops with soil and vegetation, green roofs capture rainfall, reduce heat, and extend roof lifespans. They also insulate buildings, lowering energy demands.

Porous Pavement

Unlike traditional asphalt or concrete, porous pavement allows stormwater to seep through the surface into the soil below. This reduces runoff volumes, lessens strain on stormwater systems, and reduces quantities of pollutants that reach the stormwater system.

Reconnected Wetlands & Floodplains

Many historical wetlands and floodplains have been cut off by development over time. Restoring these natural features allows them to serve their natural purpose during heavy rains, pooling and filtering water while slowly releasing it back into the water table.

Bioswales & Biofiltration

Bioswales (or biofiltration swales) are shallow, vegetated channels that collect runoff along roadways or developments. When planted with native plants, swales not only filter stormwater but also enhance the character of streetscapes and support biodiversity.

A Complete Approach to Green Infrastructure

As communities continue to grow and climate conditions become more unpredictable, stormwater management is an increasingly critical challenge. Green stormwater infrastructure offers a proven, cost-effective way to address flooding, improve water quality, and create healthier, more resilient communities. Implementation of this approach is a multidisciplinary process that draws on the expertise of planning, landscape architecture, water resources engineering, and environmental sciences to maximize its value.

By harnessing natural processes, these systems move beyond the limitations of gray infrastructure, blending engineering with ecology to deliver wide-ranging benefits. From improved air quality and habitat creation to reduced energy costs and enhanced property values, GSI demonstrates how infrastructure can serve people, nature, and the economy at once.