Streambank erosion and phosphorus loading to surface waters: Knowns, unknowns, and implications for nutrient loss reduction research and policy

Margenot, Andrew J.; Zhou, Shengnan; McDowell, Richard; Hebert, Thomas; Fox, Garey; Schilling, Keith; Richmond, Shawn; Kovar, John L.; Wickramarathne, Niranga; Lemke, Dean; Boomer, Kathy; Golovay, Shani

doi:10.1002/jeq2.20514

Cited by 6 publications

(2 citation statements)

References 116 publications

(160 reference statements)

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“…5 STEP-Sustainable Technologies Evaluation Program. 6 One Canadian $ = 0.68 European EUR (average 2019 to 2023).…”

Section: Data Sourcesmentioning

confidence: 99%

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The Role of Stream Restoration in Mitigating Sediment and Phosphorous Loads in Urbanizing Watersheds

MacKenzie,

Auger,

Beitollahpour

et al. 2024

Water

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Stream corridor erosion can majorly contribute to the overall sediment and phosphorus load in urbanizing watersheds. However, the relative contribution of stream bed and bank erosion, compared with upland watershed sources and the potential for stream restoration to mitigate total contaminant loads, is poorly understood. In this study, a new method was developed, using the percent impervious cover (PIC) indicator of urbanization to evaluate the relative contribution of the stream corridor versus upland watershed contributions to observed total sediment and phosphorus loads in the receiving watercourse. This method was used to develop a cost-optimized mitigation plan, including implementing low-impact development (LID) stormwater infrastructure for urban areas and agricultural best management practices (BMPs) for rural areas in the watershed and stream restoration for the degraded stream reaches. A new cost–benefit analysis methodology is developed and used to assess the relative benefits of the mitigation measures for the case study of the Tannery Creek sub-watershed of the East Holland River in Ontario, Canada. The novel contributions of this study include the development of three relationships to estimate sediment and associated phosphorus loading based on contributing catchment area and land use, as well as a method to optimize the costs and benefits of planned mitigation measures. The results support stream restoration as an essential and cost-effective part of a comprehensive water quality watershed management plan to help maintain healthy streams in urbanized watersheds.

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“…5 STEP-Sustainable Technologies Evaluation Program. 6 One Canadian $ = 0.68 European EUR (average 2019 to 2023).…”

Section: Data Sourcesmentioning

confidence: 99%

“…The common symptoms include change in flow regime, erosion and sedimentation, and associated impacts on pollutant loading and habitat health [4,5]. In particular, bank erosion may contribute a significant fraction of total phosphorous (P) loads [6,7].…”

Section: Introductionmentioning

confidence: 99%

The Role of Stream Restoration in Mitigating Sediment and Phosphorous Loads in Urbanizing Watersheds

MacKenzie,

Auger,

Beitollahpour

et al. 2024

Water

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A review of the development and implementation of the critical source area concept: A reflection of Andrew Sharpley's role in improving water quality

McDowell,

Kleinman,

Haygarth

et al. 2024

J of Env Quality

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Critical source areas (CSAs) are small areas of a field, farm, or catchment that account for most contaminant loss by having both a high contaminant availability and transport potential. Most work on CSAs has focused on phosphorus (P), largely through the work in the 1990s initiated by Dr. Sharpley and colleagues who recognized the value in targeting mitigation efforts. The CSA concept has been readily grasped by scientists, farmers, and policymakers across the globe. However, experiences and success have been mixed, often caused by the variation in where and how CSAs are defined. For instance, analysis of studies from 1990 to 2023 shows that the proportion of the annual contaminant load coming from a CSA decreases from field to farm to catchment scale. This finding is consistent with increased buffering of CSAs and greater contribution of other sources with scale, or variation in the definition of CSAs. We therefore argue that the best application of CSAs to target mitigation actions should be at small areas that truly account for most contaminant loss. This article sheds light on the development and utilization of CSAs, paying tribute to Dr. Sharpley's remarkable contributions to the improvement of water quality, and reflecting upon where the CSA concept has succeeded or not in reducing contaminant (largely P) loss.

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Reducing phosphorus losses from agricultural land to surface water

McDowell,

Haygarth

2024

Current Opinion in Biotechnology

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Streambank erosion and phosphorus loading to surface waters: Knowns, unknowns, and implications for nutrient loss reduction research and policy

Cited by 6 publications

References 116 publications

The Role of Stream Restoration in Mitigating Sediment and Phosphorous Loads in Urbanizing Watersheds

The Role of Stream Restoration in Mitigating Sediment and Phosphorous Loads in Urbanizing Watersheds

A review of the development and implementation of the critical source area concept: A reflection of Andrew Sharpley's role in improving water quality

Reducing phosphorus losses from agricultural land to surface water

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