sonoma creek and sediment: knowing what we don’t know

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SONOMA CREEK AND SEDIMENT: KNOWING WHAT WE DON’T KNOW. MAY 2011. SONOMA CREEK AND SEDIMENT: KNOWING WHAT WE DON’T KNOW. MAY 2011. - PowerPoint PPT Presentation

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  • SONOMA CREEK AND SEDIMENT: KNOWING WHAT WE DONT KNOWMAY 2011

  • SONOMA CREEK AND SEDIMENT: KNOWING WHAT WE DONT KNOWMAY 2011. . . somebody's certainly going to . . . find out what he knows that they may not know, and make sure he knows what they know that he may not know. --Donald Rumsfeld

  • 166 square miles 0 to 2,739 feet msl land uses:30% forest 20% grassland & rangeland 30% agricultural 15% developed 5% wetland beneficial uses: COLD, WARM, REC-1, REC-2, MIGR, RARE, SPWN, WILD

    Sonoma Valley

  • Sonoma Creek Watershed23 to 50 inches annual rainfall465 miles of USGS blue-line streamChinook salmon, steelhead trout, California freshwater shrimpHydromodified: 95% freshwater marsh drained 20% alluvial channels once disconnected now connected

  • Steelhead Timeline

  • Sonoma Creek Sediment TMDLMain focus: steelhead trout

  • Life Stages and Limiting FactorsWhat factors limit stream health in Sonoma Creek and tribs?

    stagefactorimpactUpstream migration/ Outmigration100+ barriers, 25% inaccessible habitat, predation on way outLow to highSpawning and egg incubationImpaired spawning habitat, poor cover, heatModerate to highJuvenile rearingPoor baseflow, approximately 40% habitat dry, poor cover, heatLow to high

  • Sediment-Related Limiting Factors: highest during spawning and juvenile rearing

    stagefactorimpactSpawningFine sediment in spawning gravelModerate to highSpawning/rearingDecreased channel complexityModerate to highSpawning/rearingPool filling by fine sedimentModerateRearing/ outmigrationIncreased suspended loads stress fishModerate

  • Sediment Source AnalysisWhat are the major sediment sources and how much do they input?

    +=naturalhuman

    Chart3

    25400

    4100

    8400

    16600

    Sediment Production, Natural Processes Sonoma Creek Watershed (2005)52,300 tons/year

    Surface Erosion, 6,200 tons/yr, 12%

    Channel Erosion and Incision, 25,400 tons/yr, 49%

    Soil Creep, 16,600 tons/yr, 32%

    Landslides, 4,100 tons/yr, 8%

    Sheet1

    Natural ProcessesTons/Yr%Adjust for our values

    Channel Erosion and Incision25,4000.4725145

    Landslides4,1000.084059

    Surface Erosion8,4000.158316

    Soil Creep16,6000.3016433

    Total Natural54,5001.0053952

    0.487695749453952

    Human Processes

    Channel Erosion and Incision43,2500.7643250

    Landslides9000.02900

    Surface Erosion7,5000.137500

    Soil Creep0.000

    Roads and Stream Crossings5,6000.105600

    Total Human Related57,2501.006333338500

    All Processes

    Channel Erosion and Incision68,6500.6167960

    Landslides5,0000.044950

    Surface Erosion15,9000.1415740

    Soil Creep16,6000.055544

    Roads and Stream Crossings5,6000.1415740

    Total All111,7500.99110,626

    Total111,750

    Sheet1

    0

    0

    0

    0

    Sediment Production, Natural Processes Sonoma Creek Watershed54,500 tons/year

    Landslides, 4,100 tons/yr, 8%

    Soil Creep, 16,600 tons/yr, 30%

    Channel Erosion and Incision, 25,400 tons/yr, 47%

    Surface Erosion, 8,400 tons/yr, 15%

    Sheet2

    0

    0

    0

    0

    0

    Sediment Production, Human Processes Sonoma Creek Watershed57,250 tons/year

    Roads and Stream Crossings, 5,600 tons/yr, 10%

    Landslides, 900 tons/yr, 2%

    Surface Erosion, 7,500 tons/yr, 13%

    Channel Erosion and Incision, 43,250 tons/yr, 76%

    Sheet3

    0

    0

    0

    0

    0

    Sediment Production, All Processes Sonoma Creek Watershed111,750 tons/year

    Landslides, 900 tons/yr, 9%

    Surface Erosion, 16,600 tons/yr, 30%

    Channel Erosion and Incision, 43,250 tons/yr, 59%

    Soil Creep, 3,000 tons/yr, 21%

    Chart4

    43250

    900

    7500

    Soil Creep

    5600

    Sediment Production, Human Processes Sonoma Creek Watershed (2005)64,000 tons/year

    Channel Erosion and Incision, 43,300 tons/yr, 68%

    Surface Erosion, 8,600 tons/yr, 13%

    Landslides, 900 tons/yr, 1%

    Roads and Stream Crossings, 11,200 tons/yr, 18%

    Sheet1

    Natural ProcessesTons/Yr%Adjust for our values

    Channel Erosion and Incision25,4000.4725145

    Landslides4,1000.084059

    Surface Erosion8,4000.158316

    Soil Creep16,6000.3016433

    Total Natural54,5001.0053952

    0.487695749453952

    Human Processes

    Channel Erosion and Incision43,2500.7643250

    Landslides9000.02900

    Surface Erosion7,5000.137500

    Soil Creep0.000

    Roads and Stream Crossings5,6000.105600

    Total Human Related57,2501.006333338500

    All Processes

    Channel Erosion and Incision68,6500.6167960

    Landslides5,0000.044950

    Surface Erosion15,9000.1415740

    Soil Creep16,6000.055544

    Roads and Stream Crossings5,6000.1415740

    Total All111,7500.99110,626

    Total111,750

    Sheet1

    0

    0

    0

    0

    Sediment Production, Natural Processes Sonoma Creek Watershed54,500 tons/year

    Landslides, 4,100 tons/yr, 8%

    Soil Creep, 16,600 tons/yr, 30%

    Channel Erosion and Incision, 25,400 tons/yr, 47%

    Surface Erosion, 8,400 tons/yr, 15%

    Sheet2

    0

    0

    0

    0

    0

    Sediment Production, Human Processes Sonoma Creek Watershed57,250 tons/year

    Roads and Stream Crossings, 5,600 tons/yr, 10%

    Landslides, 900 tons/yr, 2%

    Surface Erosion, 7,500 tons/yr, 13%

    Channel Erosion and Incision, 43,250 tons/yr, 76%

    Sheet3

    0

    0

    0

    0

    0

    Sediment Production, All Processes Sonoma Creek Watershed111,750 tons/year

    Landslides, 900 tons/yr, 9%

    Surface Erosion, 16,600 tons/yr, 30%

    Channel Erosion and Incision, 43,250 tons/yr, 59%

    Soil Creep, 3,000 tons/yr, 21%

    Chart7

    54500

    57250

    Percent Natural vs Human Caused Sediment Production

    Sediment Production, Natural + Human Processes Sonoma Creek Watershed116,300 tons/year

    45%

    55%

    Sheet1

    Natural ProcessesTons/Yr%Adjust for our values

    Channel Erosion and Incision25,4000.4725145

    Landslides4,1000.084059

    Surface Erosion8,4000.158316

    Soil Creep16,6000.3016433

    Total Natural54,5001.0053952

    49%53952

    Human Processes

    Channel Erosion and Incision43,2500.7643250

    Landslides9000.02900

    Surface Erosion7,5000.137500

    Soil Creep0.000

    Roads and Stream Crossings5,6000.105600

    Total Human Related57,2501.006333338500

    51%56674

    All Processes

    Channel Erosion and Incision68,6500.6167960

    Landslides5,0000.044950

    Surface Erosion15,9000.1415740

    Soil Creep16,6000.055544

    Roads and Stream Crossings5,6000.1415740

    Total All111,7500.99110,626

    Total111,750

    Sheet1

    0

    0

    0

    0

    Sediment Production, Natural Processes Sonoma Creek Watershed54,500 tons/year

    Landslides, 4,100 tons/yr, 8%

    Soil Creep, 16,600 tons/yr, 30%

    Channel Erosion and Incision, 25,400 tons/yr, 47%

    Surface Erosion, 8,400 tons/yr, 15%

    Sheet2

    0

    0

    0

    0

    0

    Sediment Production, Human Processes Sonoma Creek Watershed57,250 tons/year

    Roads and Stream Crossings, 5,600 tons/yr, 10%

    Landslides, 900 tons/yr, 2%

    Surface Erosion, 7,500 tons/yr, 13%

    Channel Erosion and Incision, 43,250 tons/yr, 76%

    Sheet3

    0

    0

    Percent Natural vs Human Caused Sediment Production

    Sediment Production, Natural + Human Processes Sonoma Creek Watershed111,750 tons/year

  • Stream channel contribution67,700 tons/year64% human caused

  • How? (Required)Control upslope sediment discharges --road and stream crossings --surface erosion --shallow landslides and gulliesReduce sediment discharge from channel incision --attentuate, reduce storm peaks --avoid impacts to stream corridors

  • How? (Recommended)Support habitat enhancement actions --increase channel complexity --enhance summer base flows --address fish barriers Reduce sediment discharge from channel incision --reverse adverse impacts of incision --implement stream restoration projects

  • Sonoma Creek Sediment TMDLMain focus: steelhead trout

  • Where?Pilot study for site prioritizationSan Francisco Foundation Bay Fund 2008 to 2010Where are the ten highest-producing sites affecting best-value spawning and rearing habitat?Upper watershed, 60 square miles above Eldridge

  • What are the highest producing sites throughout the watershed?