Water Resources Program  |  Four Seasons Stream Restoration

In March of 2015, Albemarle County completed its first natural channel design stream restoration project on a 360-ft reach of a degraded and actively-incising channel within the County’s MS4 boundary. Restoration activities involved channel grading to reconnect the channel to the floodplain; installation of riffle and pool sequences to improve aquatic habitat; installation rock sills/vanes, wood sills/vanes, and toe wood structures to ensure channel stability; and planting of native vegetation.

Prior to restoration, a Bank Erosion Hazard Index (BEHI) assessment yielded erosion hazard indices ranging from low to very high along the restoration reach. A Near Bank Stress (NBS) assessment conducted prior to restoration indicated bank stress indices ranging from low to extreme. A Bank Assessment for Non-point Source Consequences of Sediment (BANCS) assessment was conducted to estimate pre-restoration stream erosion based on the results from the BEHI and NBS assessments and found an average erosion rate of 0.165 tons/yr/ft.

By preventing erosion, this project resulted in significant “credit” for reduction of sediment, phosphorus, and nitrogen pollution in stormwater. Credit was claimed pursuant to Recommendations of the Expert Panel to Define Removal Rates for Individual Stream Restoration Projects and contributed toward Albemarle County’s Total Maximum Daily load for the Rivanna River and the Chesapeake Bay

Pre-Restoration Photographs (Four Seasons Restoration) Post-Restoration Photographs (Four Seasons Restoration)
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