A multi-year study of the U.S. Geological Survey – Evaluating the Effects of Stream-Restoration Practices in an Impaired Agricultural System – shows that natural, soft engineering techniques installed by the Pennsylvania Department of Environmental Protection (DEP) and local partners are delivering real results. These stream restoration practices – the use of logs, natural backfill, and regraded banks – significantly reduced streambank erosion, boosted floodplain sediment deposition, and improved overall stream health in an impaired agricultural watershed.
Key outcomes:
• Restored stream segments saw a seven-fold increase in net sediment retention;
• Streambank sediment flux shifted from erosional to depositional, stabilizing the system;
• Restored reaches developed coarser streambed sediments, improving habitat for fish and other aquatic life; and
• Drone-based digital elevation models provided cost effective monitoring that complemented field measurements.
These DEP-supported restoration efforts not only improved water quality but also contributed to delisting portions of Turtle Creek from the Clean Water Act 303(d) impaired waters list – a major milestone for local ecosystems and for Chesapeake Bay watershed recovery goals.
