Stream Restoration and Wetland Preservation: Glenora Tributary Restoration

Client: City of Rockville
Location: Rockville, MD

Hazen and Sawyer provided site evaluation, geofluvial survey, stream restoration design, and construction monitoring for 1,100lf of incised urban channel for a tributary to Watts Branch in Rockville, Maryland.

Project Outcomes and Benefits

  • Four alternatives were generated and ranked by environmental uplift potential, impact, and cost.
  • We determined the removal efficiencies for streamwork and off-line created wetlands in terms of ability to remove nitrogen, phosphorus, and total suspended solids from the water column so that alternatives could be ranked per cost of pound of pollutant removed.
  • The approved alternative created three new temporal pool areas and increased the overall stream length by 20% without impacting existing wetlands.
  • The stream restoration strategy involved reconstructing the channel with stable planform, dimension and profile on the adjacent flood plain.
  • The project involved extensive on- and off-site meetings with the public to secure project acceptance.

The completed, restored stream. The approved alternative created three new temporal pool areas and increased the overall stream length by 20% without affecting existing wetlands.

The stream before restoration.

As part of the project, adjacent homes were protected from scour.

Project goals included enhancing the watershed through stream restoration, wetland enhancement, reforestation, and protection of adjacent utilities.

For more information on this project, or to discuss a similar project in your area, contact tschueler@hazenandsawyer.com