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Projects

Franklin Square Stream Restoration

Stabilizing a degraded urban tributary in Baltimore County.
  • The existing trees remained in place during the project-Gannett Fleming.

    Gannett Fleming stabilized the tributary and were able to keep existing trees in place.

Client
Baltimore County Department of Environmental Protection and Sustainability

Location
Baltimore County, Maryland

Our Role
Engineering.

Data
Size
2,600 feet
Completed
2005
Type
Rehabilitation
Duration
5 years
Outcomes
  • Designed step pool systems to prevent head-cut migration upstream
  • Retained existing trees
  • Stabilized the stream channel from the bank erosion and lateral migration.

Baltimore County’s White Marsh Run is an important urban tributary flowing to the Chesapeake Bay. Once considered a heavily-degraded stream, county officials have taken a number of steps over recent years to improve the condition of the run and its tributaries.

Franklin Square Stream is a 2,600-foot tributary to White Marsh Run in the eastern part of the county. Also degraded, the channel needed to have stability restored, and the client turned to Gannett Fleming to utilize natural channel design principals to achieve its goals. 

What We Did

To accomplish the outcomes, Gannett Fleming’s Services included development of bid documents and final specifications.  We also provided on-site consultation during construction, post-construction monitoring, as-built survey certification, and performance assessments of installed structures and bioengineering improvements.

In addition to stability assessments and Rosgen stream classification tasks, our firm conducted fluvial geomorphological studies and provided sediment transport assessments, hydrology and hydraulic modeling, and reference reach investigations for application to the naturalized restoration design.  Design plans were developed at 30, 50, and 90 percent and final phases.  Coordination and field meetings with state and federal regulatory agencies were performed and a presentation to the local community regarding the project was provided.

Key Features

  • Coordination with state and federal regulatory agencies
  • Conducted fluvial geomorphological studies
  • Integrated bioengineering applications to increase channel stability
  • Provided sediment transport assessments
  • Retention of existing trees
  • Used natural channel design principals to restore stability
  • Utilized hydrology and hydraulic modeling.

Sustainability Features & Outcomes

  • Increased channel stability
  • Retention of existing trees and landscaping
  • Step pool systems were designed to prevent head-cut migration upstream.

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