Stormwater
Resilient, Sustainable Systems That Protect People, Places & Waterways
Designing for the PNW’s Most Persistent Challenge
In the Pacific Northwest stormwater is part of everyday life. From steep foothill neighborhoods to dense urban corridors, RH2 plans and designs stormwater systems that reduce flooding, protect receiving waters, and support development that aligns with community goals. The work blends technical problem-solving with meaningful impact by advancing watershed health, climate resilience, and green infrastructure to safeguard neighborhoods and natural environments throughout the region.
Understanding the Whole System
Stormwater rarely follows strict boundaries. Our teams look beyond the project site to understand upstream and downstream conditions, working with GIS maps, field data, LiDAR, and hydraulic modeling to identify the root causes of flooding, erosion, and water quality challenges. We integrate watershed-scale thinking with site-specific solutions to maximize environmental benefit and long-term performance. This approach helps our clients make informed decisions and avoid unintended impacts elsewhere in the system.
Our integrated team works together to develop solutions that balance performance, constructability, and long-term maintenance. RH2 stormwater experts are exposed to a wide range of stormwater conditions, modeling tools, and real-world site constraints.
Our Work Includes
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Stormwater planning and master planning (SMAP, SCP).
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Hydrologic and hydraulic modeling (WWHM, SWMM, variants).
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Conveyance, detention, infiltration, and water quality treatment.
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LID and green infrastructure design.
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Pump stations, outfalls, and steep slope drainage.
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Roadway and corridor drainage design.
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Municipal stormwater design reviews.
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CIP development, permitting support, and cost estimating.
Solutions That Fit Local Terrain & Community Priorities
Stormwater design in our region requires creativity and practicality because challenges like steep grades, shallow utilities, legacy infrastructure, and sensitive waterways all influence what will work long-term. We design with construction access, safety, and future maintenance in mind, bringing solutions that perform as intended during the worst storms and remain manageable for decades.
Why Communities Trust RH2
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PNW expertise: Experience with Washington State Department of Ecology and the States of Oregon and Idaho Departments of Environmental Quality (DEQ) stormwater manuals and NPDES Phase II requirements.
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Root-cause analysis: Data-driven modeling to size improvements and reduce unnecessary costs.
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Practical designs: Solutions that consider access, grading, operator needs, and long-term O&M.
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Integrated thinking: Evaluating corridor, site, and watershed needs together to prevent downstream impacts.
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Environmental stewardship: Commitment to designing systems that protect waterways, enhance habitat, and support long-term sustainability goals.
Thinking about Joining Our Team?
Stormwater work at RH2 is hands-on, collaborative, and full of variety. New team members gain experience in modeling, design, site evaluation, permitting, and cross-disciplinary problem-solving, supported by mentors who enjoy teaching and helping staff grow. Staff contribute to projects that reduce flooding, improve water quality, and restore watershed function across the region. It's a chance to work on projects that directly improve neighborhoods and protect the environment.
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