Item 5 - Ponds 6, 7 & 8 - Napa/Sonoma Marsh Restoration Project
Item 5 - Ponds 6, 7 & 8 - Napa/Sonoma Marsh Restoration Project
Item 5 - Ponds 6, 7 & 8 - Napa/Sonoma Marsh Restoration Project
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<strong>Ponds</strong> 6, 7 & 8<strong>Napa</strong> <strong>Sonoma</strong> <strong>Marsh</strong><strong>Restoration</strong> Group MeetingUSGS San Pablo Field Station Office, Building 505, Mare IslandFebruary 20, 2007
Presentation• <strong>Project</strong> Overview• Upper <strong>Ponds</strong> (8 & 7/7A) Goals and ProposedDesign• <strong>Ponds</strong> 6/6A Goals and Proposed Design• Survey and Geotechnical Investigation• Interpretive Signs• Schedule
Location Map
POND 83-36” CulvertsNAPA RIVERMUD SLOUGHCANAL CANALNAPA SLOUGH36” SiphonPOND 7ADonutPOND 736” Siphon2-30” CulvertsHUDEMANSLOUGH
3-24” Culvertswith GatesPOND 7ADonutMixingChamberCANAL CANAL36” SiphonPOND 8HUDEMANSLOUGH2 - 48” Inletswith Gate andFish ScreenPOND 73-36” CulvertsMUD SLOUGHNAPA RIVER2 - 48” Outfallswith Gate48” SiphonNAPA SLOUGH2-30” CulvertsAbandonSiphon
Upper <strong>Ponds</strong>Size Make-up Water Culverts
2 NEW 36” CULVERTS WITHGATESNEW 48” INLET WITH GATECANAL FROM POND 8POND 7A2 - 36” CULVERTS(ONE BLOCKED)POND 7/7A DONUT(MIXING CHAMBER)NEW 48” OUTFALL WITH GATEINTERNAL LEVEE36” WIDESLUICE GATEPOND 7WOODEN GATE(CLOSED)NEW CONTROL STRUCTURE
<strong>Ponds</strong> 6/6A<strong>Project</strong> Objectives• Maximize Habitat for Shorebirds andWaterfowl• Improve Management Flexibility
DEVIL’S SLOUGH48” SiphonNAPA SLOUGHCANAL48” Siphon6A DonutPOND 6APOND 66 DonutCHINA SLOUGHNAPA SLOUGH
48” SIPHON FROMPONDS 7/7APOND 6A DONUT6’ WIDESLUICE GATEPOND 6ACANAL TO POND 6 DONUT48” WIDESCREW GATE
6’ WIDESLUICEGATECANAL FROMPOND 6A DONUTPOND 6 DONUT48” SIPHON TOPOND 5POND 66’ WIDESLUICEGATE
<strong>Ponds</strong> 6/6ABird Habitat• Shorebirds: 4-15 cm depths• Dabbling Ducks: 10-30 cm depths• Diving Ducks: 30 cm to several meter depth• Maintain high water quality– Residence time– Circulation – New inlets in both ponds
<strong>Ponds</strong> 6/6AResidence TimeSouthbay Pond Acreage Vs. Residence Time800700600Pond Acreage50040030020010000.0 5.0 10.0 15.0 20.0 25.0 30.0 35.0Residence Time (days)
<strong>Ponds</strong> 6/6AResidence TimeAlviso <strong>Ponds</strong> A2W, A3W, A7, A14, A16Residence Time vs. % non-compliance(weekly data)% non-compliance (weekly data)0.80.70.60.50.40.30.20.12005 w eeklyLog. (2005 w eekly)00.0 5.0 10.0 15.0 20.0 25.0 30.0 35.0Residence Time (days)
<strong>Ponds</strong> 6/6AManagement Flexibility• New Inlet/Outlet at <strong>Napa</strong> Slough (N)• New Inlet/Outlet at <strong>Napa</strong> Slough (NW)• New Inlet/Outlet at China Slough• New Culvert(s) between <strong>Ponds</strong>• New Outfall at Little Island Farms• Breach Donuts / Abandon Canal
<strong>Ponds</strong> 6/6AResidence Time vs. Number of Pipes
NAPA SLOUGH2 - 36” Inlet/Outletwith Gates48” SiphonAbandonSiphonDonutImprovementsNAPA SLOUGH6A Donut4 - 48” Inlet/Outletwith GatesPOND 6ACANAL4-36” Outfallswith GatesPOND 64 - 36” Culvertswith Gates6 DonutDEVIL’S SLOUGH48” SiphonDonutImprovementsLITTLEISLANDFARM2-36” Inlet/Outletwith GatesCHINA SLOUGH
48” SIPHON FROMPONDS 7/7ADEMOLISHSIPHONPOND 6A DONUTBREACH DONUTDEMOLISH EX. STRUCTURE6’ WIDESLUICE GATEPOND 6ACANAL TO POND 6 DONUT48” WIDESCREW GATEBREACH DONUTDEMOLISH EX. STRUCTURE
BREACH DONUTDEMOLISH EX. STRUCTURE6’ WIDESLUICE GATECANAL FROMPOND 6A DONUTREPLACEKNIFE GATEPOND 6 DONUT48” SIPHON TOPOND 5POND 6BREACH DONUTDEMOLISH EX. STRUCTURE6’ WIDESLUICEGATE
Survey and GeotechnicalSurveys Complete:• LiDAR survey for levees• Field survey for bathymetry and structuresGeotechnical:• Borings and grab samples to obtain soil profile and soilcharacteristics• Settlement, Slope Stability and Seepage AnalysesLevee Improvement Areas:• Updated based on survey and additional field walks
Interpretive Signs
Interpretive Signs
Interpretive Signs
Interpretive Signs
Schedule• Finalize Geotechnical Analyses• Finalize Levee Improvement Criteria/Design• Finalize Mixing Chamber Design• 50% Submittal- March 2007
Questions?
Upper <strong>Ponds</strong>Mixing Chamber Flow SummaryFlow (afy)Base CaseOptimizePond 7AAdditional 30-inch inlet atPond 8Pond 7A Outflow6,3829,8849,267Pond 8 Outflow3,9673,6104,963Pond 7 Outflow104136144Outflow to <strong>Napa</strong> Slough10,45013,63014,370Base Case Structures:•Culvert from Pond 7A to 7 for Make up Water•2 New 48” Outlets at <strong>Napa</strong> Slough•New 48” Inlet from Hudeman Slough to Pond 7A•New 48” Culvert with Gate from Pond 7A to MC•New Control Structure from Pond 7 to MC
36” CULVERTCANAL FROM POND 8POND 7A2 - 36” CULVERTS(ONE BLOCKED)POND 7/7A DONUT(MIXING CHAMBER)INTERNAL LEVEE36” WIDESLUICE GATEPOND 7WOODEN GATE(CLOSED)
Geotechnical InvestigationPond 8
Geotechnical InvestigationPond 7/7A
Geotechnical InvestigationPond 6/6A
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