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V.3.1 11/13/2023
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Streambank Sediment & Nutrient Reduction Crediting* Mitchell Woodward, NC Cooperative Extension
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1200
Total Linear Feet of Streambank Repaired (assumes 1 bank, 2x if repairing both banks)
User supplied data
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5
Avg Height of Streambank (vertical difference from OHWM to Top of Bank)
Calculated
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368
Estimated Annual Soil Erosion Reduction (tons post-repair)*
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654
Estimated Annual N Reduction (lbs)
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386
Estimated Annual P Reduction (lbs)
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$52,390
Value of Nitrogen Removed Per Year (Total lbs of N removed * $80.08/lb of N from average DMS)**
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$119,884
Value of Phosphorus Removed Per Year (Total lbs of P removed * $310.65/lb of P from average DMS)**
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References and Assumptions for the Above Calculations
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*Area of triangular shaped bank*length of bank repaired*avg wt. cubic ft of soil/2000 lbs ton*73% avg effectivness of repairs
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**Reference: https://www.chesapeakebay.net/channel_files/30006/nutrient_credit_evaluation_final_report_ncsu_9-17-18.pdf Dr. Barbara Doll, PE
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***Nutrient fee schedules from NC Div of Mitigation Services. https://deq.nc.gov/about/divisions/mitigation-services/dms-customers/fee-schedules. Mean from 3 river basins 2016: N $80.08/lb, P $310.65/lb
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****NOTE: The BEHI rating can used to evaluate sediment reduction before and after the repair project.
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