RESTORATION OPPORTUNITIES ON NOVATO CREEK HAMILTON AND BEYOND Tom Gandesbery State Coastal...
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Transcript of RESTORATION OPPORTUNITIES ON NOVATO CREEK HAMILTON AND BEYOND Tom Gandesbery State Coastal...
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RESTORATION RESTORATION OPPORTUNITIES ON OPPORTUNITIES ON
NOVATO CREEK NOVATO CREEK HAMILTON AND BEYONDHAMILTON AND BEYOND
Tom GandesberyState Coastal Conservancy
WWW. SCC.CA.GOV
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H/BMK Who is Involved?
• Consulting Firms: PWA and Noble / NHC• Marin County Flood Control / Public Works• USACOE• City of Novato• BMK CSD and several members of community• Water District• Sanitary Districts (2)• Home Owner’s Associations• Environmental Community• Trail Advocates• NOAA
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Landscape Level Design
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Sonoma Baylands
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Historic Context
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North Bay Project Potential
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BMK V 1600 ac -Owned by SCC
NAF ~200ac Owned by SLC
Airfield 622ac -Owned by SCC
Project is 3 Properties = 2600 acres
Bel Marin Keys Homes
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Looking East from over Hwy 101
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LTMS ~ Hamilton Link
Partners involved in:
Pre-project planning (Since 1993)
1999 Congressional Approval of Hamilton
Federal and State Appropriations
Stakeholder Involvement (Local Gov and NGO)
Fosters Collaboration: Work between agencies
Support by Maritime Interest Groups
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LTMS StrategyBCDC / USEPA / RWQCB / USACOE
LTMS Program EIS/EIR (1994) and ROD (1999)Disposal and Reuse Goal of 40/40/2020-Year Planning Horizon40% Ocean Disposal 40% Reuse20% In-Bay
0.0
1.0
2.0
3.0
4.0
5.0
6.0
7.0
8.0
1999-2001 2002-2004 2005-2007 2008-2010 After 2010
COE
Medium
Small
E x is t in g D is p o s a l L im i t W e t Y e a r
E x is t in g D is p o s a l L im i t D r y Y e a r
H o w W i l l W e G e t T h e r e ?
T r a n s i t i o n P e r io dH o w W i l l W e G e t T h e r e ?
T r a n s i t i o n P e r io dM
illio
ns o
f C
ubic
Yar
ds/Y
ear
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Multiple Objectives
1. Marsh Restoration using Dredged Sediment ( LTMS)
2. Tidal Marsh Habitat benefiting Endangered Species Part of a Larger Initiative (see map)
Habitat Linkages With in USFWS / DGS Refuge System
3. Well Planned Reuse of Military Lands BRAC No-Cost Conveyance to SCC
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• Scan pdf
Total Project Conceptual Design
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Design ObjectivesCreation of 3 habitat types
tidal wetlandsseasonal wetlandsuplands
To benefit an array of speciesendangered (saltmarsh harvest mouse, clapper rail)
shorebirds (e.g. greater yellowlegs, long-billed curlew)
local wildlife (e.g. marsh hawk, voles, butterflies)
With minimal long-term maintenance
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Hamilton Wetlands Restoration Project
Authorized in WRDA 1999 - $55,200,000 • Purpose: Ecosystem and Wetlands Restoration• Restores approximately 990 acres of habitat including:
– 570 Acres of Coastal Salt Marsh– 120 Acres of tidal channels and intertidal habitats
• Accommodates approximately 10.6MCY of dredged material
• 13 years of Adaptive Management Post Breach• Complete Restoration – 20 Years
Regardless of the availability of dredged material, the bay ward levee breach would be completed no later than 8 years after initiation of site preparation to ensure that marsh establishment would not be delayed
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First DM Restoration Sonoma Baylands (Before)
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(After)
Wave – Fetch Berms
Pilot Channel (Mosquito Ditch)
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Habitat Types at Hamilton
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Hamilton Site Template
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Hamilton Site at 10 Years
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Hamilton Site at 50 Years
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Progress 3 Major Phases
• For Airfield– Built 3 out of five levee segments– Seasonal Wetland Design ~50% complete– Trail plan complete– DM placement cells for first phase compete– Major DM placement - start winter of 2007 – 2005 rec permits – Monitoring required
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Antenna Field Status
190 Acres
~ 30 Acres in southeast corner used for:
Shooting range
Antenna field
Burn Pits (fire training, etc)
Spot Removals completed in 1990s
Clean-up Plans are in a regulatory process
After remediation, restored as Phase II or III of the project
Cleanup scheduled for 2008
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BMKV Status
Awaiting Congressional Approval to Add to Hamilton (WRDA)Elements completed:
Supplemental EIS/EIR for Bel Marin Keys Unit V Completed December 2003.
General Reevaluation Report (GRR) a revision to the FS
Draft Chief’ Report written
Revised Cost Estimates
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Toxics Remediation
This is another Workshop!• Done by Army / Navy BRAC• 1990s - BRAC work within Hamilton • Contaminants typical of an large airport• $70 Million (about) on soil cleanup - no groundwater• Cleanup complete this FY • Cleanup plan adopted 2003• Low level (residual) DDT in soil was managed by project
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Public Access
• Trail will run western parameter of site • To BMK Blvd North and connect to ? South• User –wildlife interaction
– Nesting birds most sensitive
• Sophisticated Trail Design(Mixture of cable fencing,moat, signage, elevation)
Required monitoring– Methods? – Applicable to Adaptive Management
•
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Site is subsided show cross sect
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The Project at HAAFHabitat Upland Tidal wetland Seasonal wetland
Goal local wildlife endangered species shorebirds migratory species
Physical corridor tidal action tidal inundationcorollaries restricted access sedimentation ppt inputs
escape terrain channel network/form high soil salinity
Vegetation native overstory Salicornia open pannes,mixed understory stressed
Salicornia,matrix of
native wetland
Challenges weeds design template design w/ man optionsinund/salinity
regimeweeds
Uncertaintylow low to moderate high
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Seasonal Wetland Design
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High Priorities for Monitoring
PhysicalPlaced sediment elevation (No overfilling!)Levee erosion and stability (flood control)
Channel developmentHydrology inside and outboard
ChemicalMeHg (Corps, Calfed)Conventionals and sediment (e.g. redox)
BiologicalBird use Clapper rail and SMH MouseFish use
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Design
Monitoring
Evaluation
Decision
Implementation
salinity, indundation, veg, birds
Evaluation
Strategy
Design
Adaptive Management:Monitoring specific
to objectives, uncertainties
Modified from Sit and Taylor 1998
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time
reso
urc
e q
ual
ity
HAAF ADAPTIVE MANAGEMENT CYCLES
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AVAILABLE STUDIES
• Collins, L July 1998, Sediment Sources and Fluvial Geomorphic Processes of Lower Novato Creek Watershed.
• Prunuski Chatham, Inc, April 2001, Novato Creek Watershed, Erosion Inventory and Sediment Control Plan
• Phillip Williams and Associates, May 7, 2002, Flood and Sediment Study for Lower Creek
(All are reports to or for Marin County Flood or PW)
OTHERS?
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Results of BMK H&H2 lead to….
• Confirms previous findings
• Quantifies some parameters
• Poses new questions– Like…. upstream flood routing– Influence of Black Point as tidal basin
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Novato Creek Hydraulic Modeling
northwest hydraulic consultants
May 2006
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Study Objective
• Investigate potential hydraulic impacts to Novato Creek if BMK-V parcel is restored to tidal wetlands
– Develop 1-d HEC-RAS model for existing conditions
– Develop 1-d HEC-RAS model for project conditions
– Conduct comparative simulations of different flooding scenarios with coincident high flow and tide
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Study Area
Bel Marin Keys Unit V
(BMK-V) expansion site
North LockNorth Lock
South LockSouth Lock
Bel Marin Bel Marin KeysKeys
developmentdevelopment
Pacheco Pacheco PondPond
San Pablo San Pablo BayBay
Novato Novato CreekCreek
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0
1,000
2,000
3,000
4,000
5,000
6,000
7,000
8,000
9,000
0 4 8 12 16 20 24 28 32 36 40 44 48 52 56 60 64 68 72
Time (hrs)
Inflo
w (c
fs)
USACE (1987) 100-yr hydrograph
Hydrograph scaled to peak flow of 8,000 cfs (100-yr flood)
Hydrograph scaled to peak flow of 3,420 cfs (10-yr flood)
Novato Creek
Inflow Flood Hydrographs Novato CreekNovato Creek
USACE 100-yr peak flow 6,230 USACE 100-yr peak flow 6,230 cfscfs
100-yr peak flow 8,000 cfs100-yr peak flow 8,000 cfs
10-yr peak flow 3,420 cfs10-yr peak flow 3,420 cfs
Arroyo San JoseArroyo San Jose
100-yr peak flow 2,403 cfs100-yr peak flow 2,403 cfs
10-yr peak flow 1,340 cfs10-yr peak flow 1,340 cfs
Pacheco CreekPacheco Creek
100-yr peak flow 1,041 cfs100-yr peak flow 1,041 cfs
10-yr peak flow 582 cfs10-yr peak flow 582 cfs
0
1,000
2,000
3,000
0 4 8 12 16 20 24 28 32 36 40 44 48 52 56 60 64 68 72
Time (hrs)
Inflo
w (c
fs)
100-yr hydrograph
10-yr hydrograph
Arroyo San Jose
0
1,000
2,000
3,000
0 4 8 12 16 20 24 28 32 36 40 44 48 52 56 60 64 68 72
Time (hrs)
Inflo
w (c
fs)
100-yr hydrograph
10-yr hydrograph
Pacheco Creek
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Modeling Scenarios
19 flood and geometric scenarios:
• 100-year river flood & 10-year tide– Existing conditions (Baseline/No bridges/Leveroni levee
breach/Accreted)– Project conditions (Project/No bridges/Leveroni levee breach)
• 10-year river flood & 100-year tide– Existing conditions (Baseline/No bridges/Leveroni levee breach)– Project conditions (Project/No bridges/Leveroni levee breach)
• 100-year river flood & 100-year tide– Existing conditions (Baseline/No bridges/Leveroni levee breach)– Project conditions (Project/No bridges/Leveroni levee breach)
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Flooding Flooding patternpattern
ExistingExisting
ProjectProject
Modeling Results –100-year flood & 10-year tide
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Modeling Results –10-year flood & 100-year tide
Flooding Flooding patternpattern
ExistingExisting
ProjectProject