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Abstract: Session F  3:50 pm (Back to Session F)
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Where did all this Sand Come From? – Observations from A Recently Constructed Stream Project Near Ellicott City

Katie Talley
Biohabitats
Baltimore, MD

Authors: Katie Talley and Mike Trumbauer

The Timbers at Troy Stream Restoration located on an unnamed tributary to Deep Run near Elkridge, Maryland, was completed in March 2018. The intent of the project was to restore a functional floodplain and reduce bank erosion and consequently the supply of sediment and adhered nutrients downstream. The design approach entailed stabilizing the existing channel bed, while raising the channel invert to allow floodplain reconnection where possible and increasing habitat structure throughout the project reach.

Two months after completion, the project found itself in the path of the training thunderstorms that developed over Ellicott City on May 27, 2018. While the project’s watershed was on the fringe of the heaviest rainfall, wrack lines from the flood indicated a flow depth of 1’ across the floodplain. As a result of the flood, the major impacts to the site included sedimentation, movement of riffle material, localized bed erosion, and loss of plant material.  This presentation will discuss what we learned about how nature adapts designs and how we, as designers, can adapt our existing design methods for the future.