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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
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I Live in a Watershed
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Flood Control District Role/Responsibility/Opportunity Manage 72 miles of stream channel Manage regional detention basins Watershed-wide planning C-3/HMP regional facilities
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The Flood Protection System Green Valley Ck Alamo Ck West Sycamore Ck San Ramon Ck Las Trampas Ck Upper Pine Ck Galindo Ck` Grayson & Murderers Cks Pacheco Ck Rodeo Ck Pinole Ck Garrity Ck Rheem Ck San Pablo Ck Wildcat Ck East Antioch Ck Marsh Ck Sand Ck Deer Ck Dry Ck Kellogg Ck Marsh Ck Reservoir
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Contra Costa County Creek Conditions
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Flood Control District Role/Responsibility/Opportunity Manage 72 miles of stream channel Manage regional detention basins Watershed-wide planning C-3/HMP regional facilities
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Changing Strategies Stormwater connectivity or stormwater retention Armored channels or natural systems Floodplain function Land use changes and re-engineered creeks Maintenance activities
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1800 Historical Coyote Creek Drainage Network
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2005 Modern Coyote Creek Drainage Network
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Unconfined Groundwater Recharge Basin 2005
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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 Expansion Strentzel Creek Meadow Restoration Knightsen Biofilter Canada del Cierbo Restoration San 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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Collaboration – Collaboration - Collaboration Watershed Councils/Creek Groups Cities/Municipal Advisory Councils Neighborhood groups/property owners Contra Costa Watershed Forum Watershed Atlas
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Stormwater Program Role Coordinated development of HMP Stormwater C-3 Guidebook Case Studies/Research Education/Adaptive Training Stream 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 possible New 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 possible New Design Concept - Protect structures and retain stormwater as long as possible
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Hydrograph Modification Management Increase retention time Increase stream stability Healthy sustainable watershed Cumulative improvement
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The Impact of Impervious Surfaces
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Stream Stability Approach Historical System Present System Compare Past and Present Understand Changes Recommendations and Restoration Templates
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Sustainable Watershed Community Water Quality/Quantity (Hydrology) Habitat (Ecology) Creek Stability/Function (Geomorphology)
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The Future At the parcel level LID Homeowner education Landscape contractors
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The Future At the Watershed level 2 nd generation facilities System preservation/ replacement Clean Water Regional Treatment Regional retention facilities The 50 year plan Marsh Creek Reservoir
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G:grpdata/admin/mitch/pp presentation/FC-Erosion Control Remember you live in a Watershed too………..
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