Stormwater Design Projects

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How effectively we manage, treat, and use stormwater as a resource is one of the most critical issues facing growing human populations in increasingly developed landscapes. Herrera designs stormwater conveyance, treatment and flow control at scales from site to regional and in settings including high use industrial sites, urban developments, neighborhoods, and sensitive ecological sites. Our services include hydraulic and hydrologic modeling, master planning, development of plans, specifications, and cost estimates (PS&E), and construction oversight. We are national experts in green stormwater infrastructure/low impact development, and our engineers collaborate with our scientists on cutting edge research and development to improve performance of GSI facilities, through development of improved bioretention media blends. In sensitive ecological settings, our geomorphologists, ecologists, and landscape architects work with our clients to design stormwater facilities that enhance habitat and manage stormwater.

Squalicum Creek Trail Cornwall Connector

Silver Beach Creek Water Quality Retrofit

Pacific Lumber Stormwater Conveyance and Treatment

Swift Creek Sediment Management Action Plan Implementation

Julianna Park Improvements

Port of Everett Stormwater Treatment Alternatives Analysis

Stateside Student Housing Development

Port of Seattle’s Fishermen’s Terminal Redevelopment

Greywater and Rainwater Systems Design for BLOCKHouse: Homes for the Homeless

City of Marysville: Engineering for Olympic View Park Improvements

Westridge Place to Stoney Creek Way Trail Connector

Civil Engineering for Pasado’s Safe Haven Expansion

Astoria Nordic Heritage Park

Mercer Island Decant Facility Retrofit

Stillaguamish Village Design

Delridge Natural Drainage Solutions

SR 167 Completion Habitat Mitigation and Stormwater Design

Cordata Trail to Elementary School

Albany Steet Stormwater Pond

Evaluating Stormwater Retrofit and Restoration Opportunities in the Lower-Middle Deschutes River

Stormwater Program Support for Tumwater

D Avenue Green Street Stormwater Enhancement

Community Park at Cordata

Stormwater Infiltration and Impacts on Groundwater

University CSO GSI Design Project

Seattle Center Campus Green Stormwater Retrofit

BMP Certification Services

Retrofits to Reduce Phosphorus in Stormwater

Park Place Facility Design and POST Media Development

East Orchard Retrofit and Design

Lake Whatcom Stormwater Capital Program

Washington State Low Impact Development Training

Marymoor and Overlake Sustainable Redesign

Chambers Lake Stormwater Treatment Facility

Zhenjiang Sponge City Infrastructure Planning

City of San Francisco Typical Plans and Specifications for Green Stormwater Infrastructure