Hazen and Sawyer has provided comprehensive stream valley restoration services to municipal and private clients. We have a dedicated team of engineers and scientists whose expertise with the evaluation, design and construction of complex ecological projects produces quantiﬁable water quality improvement and infrastructure protection.
In Rockville (MD), our stream restoration created three new temporal pool areas and increased the overall stream length by 20% without impacting existing wetlands.
As part of the Staten Island Bluebelt, we designed the restoration of a 200 linear foot segment of the Sweet Brook stream and the creation of a new 500 linear foot stream segment.
As part of an Open End Agreement, Anne Arundel County contracted us to review and design stabilization and protection methods for exposed gravity sanitary sewer assets located within existing streambeds. Pictured here is an exposed asset before intervention.
A protected asset after placement of in-stream grade control in Anne Arundel County. This control provides protection against pipe abrasion, impact damage, and sagging by keeping the pipe buried below the stream bed.
In Jefferson County (AL), we are restoring a stream bed with new geometry and grade controls to protect several exposed assets. Particle counts, such as the one pictured here, establish the size of stream bed material and allow us to classify the stream in terms of pattern and stability; in addition, this information determines how powerful the impaired stream flow is so as to inform the design of a stable condition.
Hazen provided expert witness analysis to successfully protect Manatee County (FL) from undue bank erosion litigation.
The Batchelors Run stream restoration involved geoﬂuvial ﬁeld evaluation, design, permitting and construction management services for 2,700 linear feet of incising eroding G4c stream on Maryland National Capital Park and Planning Commission (MNCPPC) land near Norbeck (MD).
The City of Richmond asked Hazen and Sawyer to provide analysis, design, and construction management for the Upper Bellemeade Bank Repair to reduce bank erosion, provide better water quality, and generally reduce nutrient production in a quantifiable manner.
Our team of recognized experts specializes in restoration of degraded stream channels, ﬂoodplain wetlands, and riparian habitat. Hazen also has broad experience with innovative best management practices for control of polluted stormwater runoff. Our work has provided clients with clear direction for the wise use of resources to maximize ecological uplift and ensure project success.
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