flood control and erosion control in contra costa county streams
DESCRIPTION
Flood Control and Erosion Control in Contra Costa County Streams. StormCon Workshop May 12, 2006 San Ramon, California Mitch Avalon Contra Costa County Flood Control District. I Live in a Watershed. Flood Control District Role/Responsibility/Opportunity. Manage 72 miles of stream channel - PowerPoint PPT PresentationTRANSCRIPT
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Flood Control and Erosion Control in Contra Costa County Streams StormCon WorkshopMay 12, 2006San Ramon, CaliforniaMitch AvalonContra Costa County Flood Control District
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I Live in a Watershed
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Flood Control District Role/Responsibility/Opportunity
Manage 72 miles of stream channelManage regional detention basinsWatershed-wide planningC-3/HMP regional facilities
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The Flood Protection System
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Contra Costa County Creek Conditions
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Flood Control District Role/Responsibility/Opportunity
Manage 72 miles of stream channelManage regional detention basinsWatershed-wide planningC-3/HMP regional facilities
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Changing Strategies
Stormwater connectivity or stormwater retentionArmored channels or natural systemsFloodplain functionLand use changes and re-engineered creeksMaintenance activities
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1800Historical Coyote Creek Drainage Network
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2005Modern Coyote Creek Drainage Network
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Unconfined Groundwater Recharge Basin2005
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Las Trampas Creek - 1966
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Pinole Creek Flood Control Channel
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Pinole Creek Greenway Project Upper Reach
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Pinole Creek Greenway Project Lower Reach
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Recent and Planned Restoration Projects
Pacheco Marsh Restoration Marsh Creek Reservoir ExpansionStrentzel Creek Meadow RestorationKnightsen BiofilterCanada del Cierbo RestorationSan Ramon Creek Bioengineering Repair
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Pacheco Marsh 120 acre Tidal Wetland Restoration
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Marsh Creek Reservoir
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Marsh Creek Reservoir 218 Acre Expansion
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Strentzel Creek Meadow Grading Plan
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Strenzel Creek Planting
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Downtown Knightsen
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Canada del Cierbo Mitigation
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Canada del Cierbo Mitigation
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Collaboration Collaboration - Collaboration
Watershed Councils/Creek GroupsCities/Municipal Advisory CouncilsNeighborhood groups/property ownersContra Costa Watershed ForumWatershed Atlas
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Stormwater Program Role
Coordinated development of HMPStormwater C-3 GuidebookCase Studies/ResearchEducation/Adaptive TrainingStream and Wetlands System Protection Policy
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Downtown Walnut Creek - 1958
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A New Approach
Historic Design Concept- Protect structures and convey stormwater off as fast as possibleNew Design Concept- Protect structures and retain stormwater as long as possible
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Grayson Creek Channel - 1957
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A New Approach
Historic Design Concept- Protect structures and convey stormwater off as fast as possibleNew Design Concept- Protect structures and retain stormwater as long as possible
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Hydrograph Modification Management
Increase retention timeIncrease stream stabilityHealthy sustainable watershedCumulative improvement
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The Impact of Impervious Surfaces
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Stream Stability Approach
Historical SystemPresent SystemCompare Past and PresentUnderstand ChangesRecommendations and Restoration Templates
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Sustainable WatershedCommunityWater Quality/Quantity(Hydrology)Habitat(Ecology)Creek Stability/Function(Geomorphology)
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The Future
At the parcel levelLIDHomeowner educationLandscape contractors
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The Future
At the Watershed level2nd generation facilitiesSystem preservation/ replacementClean Water Regional TreatmentRegional retention facilitiesThe 50 year planMarsh Creek Reservoir
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Remember you live in a Watershed too..
G:grpdata/admin/mitch/pp presentation/FC-Erosion Control