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Report
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McKnight, K.; Braud, A.; Dusterhoff, S.; Grenier, L.; Shaw, S.; Lowe, J.; Foley, M.; McKee, L. 2023. Conceptual Understanding of Fine Sediment Transport in San Francisco Bay. SFEI Contribution No. 1114. San Francisco Estuary Institute: Richmond, CA.

Sediment is a lifeblood of San Francisco Bay (Bay). It serves three key functions: (1) create and maintain tidal marshes and mudflats, (2) transport nutrients and contaminants, and (3) reduce impacts from excessive human-derived nutrients in the Bay. Because of these important roles, we need a detailed understanding of sediment processes in the Bay.


This report offers a conceptual understanding of how fine-grained sediment (i.e. silt and finer, henceforth called fine sediment) moves around at different scales within the Bay, now and into the future, to synthesize current knowledge and identify critical knowledge gaps. This information can be used to support Bay sediment management efforts and help prioritize funding for research and monitoring. In particular, this conceptual understanding is designed to inform future San Francisco Bay Regional Monitoring Program (RMP) work under the guidance of the Sediment Workgroup of the RMP for Water Quality in San Francisco Bay, which brings together experts who have worked on many different components of the landscape, including watersheds and tributaries, marshes and mudflats, beaches, and the open Bay. This report describes sediment at two scales: a conceptual understanding of open-Bay sediment processes at the Bay and subembayment scale (Chapter 2); and a conceptual understanding of sediment processes at the baylands scale (Chapter 3). Chapter 4 summarizes the key knowledge gaps and provides recommendations for future studies.

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Bigelow, P.; Pearce, S.; McKee, L. J. . 2009. Dry Creek Watershed Sediment Source Reconnaissance Technical Memorandum. SFEI Contribution No. 595. San Francisco Estuary Institute: Oakland,Ca.
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David, N.; McKee, L. J. . 2009. Going Organic Project. SFEI Contribution No. 588. San Francisco Estuary Institute: Oakland, Ca.
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Wu, J.; Kauhanen, P.; Hunt, J.; McKee, L. 2018. Green Infrastructure Planning for North Richmond Pump Station Watershed with GreenPlan-IT. SFEI Contribution No. 882. San Francisco Estuary Institute: Richmond, CA.
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Wu, J.; Kauhanen, P.; Hunt, J.; McKee, L. 2018. Green Infrastructure Planning for the City of Oakland with GreenPlan-IT. SFEI Contribution No. 884. San Francisco Estuary Institute : Richmond, CA.
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Wu, J.; Kauhanen, P.; Hunt, J.; McKee, L. 2018. Green Infrastructure Planning for the City of Richmond with GreenPlan-IT. SFEI Contribution No. 883. San Francisco Estuary Institute: Richmond, CA.
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Wu, J.; Kauhanen, P.; Hunt, J.; McKee, L. 2018. Green Infrastructure Planning for the City of Sunnyvale with GreenPlan-IT. SFEI Contribution No. 881. San Francisco Estuary Institute : Richmond, CA.
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Kauhanen, P.; Wu, J.; Hunt, J.; McKee, L. 2018. Green Plan-IT Application Report for the East Bay Corridors Initiative. SFEI Contribution No. 887. San Francisco Estuary Institute: Richmond, CA.
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McKee, L. J. .; Pearce, S.; Shonkoff, S. 2006. Pinole Creek Sediment Source Assessment: Pavon Creeks Sub-basin. SFEI Contribution No. 515. San Francisco Estuary Institute. p 67.
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Gilbreath, A.; McKee, L.; Hunt, J. 2021. Pollutants of Concern Reconnaissance Monitoring Progress Report, Water Years 2015-2020. SFEI Contribution No. 1061. San Francisco Estuary Institute: Richmond, CA.

The San Francisco Bay polychlorinated biphenyl (PCB) and mercury (Hg) total maximum daily loads (TMDLs) call for implementation of control measures to reduce PCB and Hg loads entering the Bay via stormwater. In 2009, the San Francisco Bay Regional Water Quality Control Board (Regional Water Board) issued the first Municipal Regional Stormwater Permit (MRP). This MRP contained a provision aimed at improving information on stormwater pollutant loads in selected watersheds (Provision C.8.) and piloted a number of management techniques to reduce PCB and Hg loading to the Bay from smaller urbanized tributaries (Provisions C.11. and C.12.). To address C8, a previously developed fixed station loads monitoring technique was refined that incorporated turbidity and stage sensors recording at 5-15 minute intervals with the collection of velocity and water samples using both manual and auto sampling techniques to compute loads. In 2015, the Regional Water Board issued the second iteration of the MRP. “MRP 2.0” placed an increased focus on identifying those watersheds, source areas, and source properties that are potentially the most polluted and are therefore most likely to be cost-effective areas for addressing load-reduction requirements.

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Gilbreath, A.; Wu, J.; Hunt, J.; McKee, L. 2018. Pollutants of Concern Reconnaissance Monitoring Water Years 2015, 2016, and 2017. SFEI Contribution No. 840. San Francisco Estuary Institute: Richmond, CA.
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Wu, J.; McKee, L. 2019. Regional Watershed Modeling and Trends Implementation Plan. SFEI Contribution No. 943. San Francisco Estuary Institute: Richmond, CA.
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Wu, J.; Gilbreath, A.; McKee, L. J. 2017. Regional Watershed Spreadsheet Model (RWSM): Year 6 Progress Report. SFEI Contribution No. 811. San Francisco Estuary Institute: Richmond, CA.
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McKee, L. J. .; GeoSyntec,. 2006. Review of methods to reduce urban stormwater loads. SFEI Contribution No. 429. San Francisco Estuary Institute: Oakland. p 150xx.
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McKee, L. J. . 2008. Review of sediment gauging studies in Alameda Creek Watershed. SFEI Contribution No. 571. San Francisco Estuary Institute.
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McKee, L. J. .; Feng, A.; Sommers, C.; Looker, R. 2009. RMP Small Tributaries Loading Strategy. San Francisco Estuary Institute: Richmond, CA.
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Wu, J.; Trowbridge, P.; Yee, D.; McKee, L.; Gilbreath, A. 2018. RMP Small Tributaries Loading Strategy: Modeling and Trends Strategy 2018. SFEI Contribution No. 886. San Francisco Estuary Institute : Richmond, CA.
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McKee, L.; Peterson, D.; Braud, A.; Foley, M.; Dusterhoff, S.; Lowe, J.; King, A.; Davis, J. 2023. San Francisco Bay Sediment Modeling and Monitoring Workplan. SFEI Contribution No. 1100. San Francisco Estuary Institute: Richmond, CA.

This document was prepared with guidance gained through two RMP Sediment Workgroup workshops held in late 2022 and early 2023. Given the variety of participants involved, this Workplan encompasses interests beyond San Francisco Bay RMP funders. We thank the attendees for their contributions. 

In 2020, the Sediment Workgroup (SedWG) of the Regional Monitoring Program for Water Quality in San Francisco Bay (RMP) completed a Sediment Monitoring and Modeling Strategy (SMMS) which laid out a conceptual level series of data and information gaps and generally recommended the use of both empirical data collection and modeling tools to answer initial high priority management questions (McKee et al., 2020). At the time, the SMMS promoted the use of surrogates such as time-continuous turbidity measurements for cross-section flux modeling within the Bay without an understanding of existing Bay hydrodynamic models, their strengths, weaknesses, and potential uses for understanding coupled Bay-mudflat-marsh processes. Since then, the Wetland Regional Monitoring Program (WRMP, www.wrmp.org) has generally promoted the use of coupling monitoring and modeling techniques to inform wetlands sediment management decisions. In addition, he completion of the Sediment for Survival report (a RMPEPA funded collaboration) and the further development of sediment conceptual models has also advanced the need for a coupled dynamic modeling and monitoring program that has the capacity to explore more complex management questions (Dusterhoff et al., 2021; SFEI, 2023). Such a program will take time to develop, but will be more cost-efficient and adaptable and allow for more timely answers to pressing questions. 

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Bigelow, P.; Pearce, S.; McKee, L. J. .; Gilbreath, A. N. 2008. A Sediment Budget for Two Reaches of Alameda Creek. SFEI Contribution No. 550. San Francisco Estuary Institute.
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Schoellhamer, D.; McKee, L.; Pearce, S.; Kauhanen, P.; Salomon, M.; Dusterhoff, S.; Grenier, L.; Marineau, M.; Trowbridge, P. 2018. Sediment Supply to San Francisco Bay. SFEI Contribution No. 842. San Francisco Estuary Institute : Richmond, CA.
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McKee, L. J. . 2005. Sources, Pathways, and Loadings: 5-Year Work Plan (2005-2009). SFEI Contribution No. 406. San Francisco Estuary Institute. p 25.
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Oram, J. J.; McKee, L. J. .; Davis, J. A.; Sedlak, M.; Yee, D. 2008. Sources, Pathways and Loadings Workgroup: Five-Year Workplan (2008-12). SFEI Contribution No. 567. San Francisco Estuary Institute: Oakland.
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Pearce, S.; McKee, L. 2020. Summary of Water Year 2017 precipitation, discharge, and sediment conditions at selected locations in Arroyo de la Laguna watershed, with a focus on Arroyo Mocho. SFEI Contribution No. 912. San Francisco Estuary Institute: Richmond, CA.

This report summarizes the precipitation, discharge, and sediment conditions observed from October 1, 2016 to September 30th, 2017 (Water Year (WY) 2017) in the Arroyo de la Laguna watershed, with a focus on the Arroyo Mocho watershed. This information was collected by the Zone 7 Water Agency to support operation and maintenance of their flood control facilities. Additionally, this and similar information collected in WY 2018 and 2019 will be utilized to update the Arroyo Mocho watershed sediment budget (Pearce et al, 2020).

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Software
Hale, T.; Sim, L.; McKee, L. J. 2018. GreenPlan-IT Tracker.

This technical memo describes the purpose, functions, and structure associated with the newest addition to the GreenPlan-IT Toolset, the GreenPlan-IT Tracker. It also shares the opportunities for further enhancement and how the tool can operate in concert with existing resources. Furthermore, this memo describes a licensing plan that would permit municipalities to use the tool in an ongoing way that scales to their needs. The memo concludes with a provisional roadmap for the development of future features and technical details describing the tool’s platform and data structures.

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