Flood Control and Erosion Control in Contra Costa County

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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
I Live in a Watershed
Flood Control District
Role/Responsibility/Opportunity

 Manage 72 miles of stream channel
 Manage regional detention basins
 Watershed-wide planning
 C-3/HMP regional facilities
The Flood Protection System




                            Marsh Ck
                            Reservoir




              Sycamore Ck
Contra Costa County Creek Conditions
Flood Control District
Role/Responsibility/Opportunity

 Manage 72 miles of stream channel
 Manage regional detention basins
 Watershed-wide planning
 C-3/HMP regional facilities
Changing Strategies

 Stormwater connectivity or stormwater
  retention
 Armored channels or natural systems
 Floodplain function
 Land use changes and re-engineered
  creeks
 Maintenance activities
      1800




Historical Coyote Creek
Drainage Network
      2005




Modern Coyote Creek
Drainage Network
                 2005
Unconfined
Groundwater
Recharge Basin
Las Trampas Creek - 1966
Pinole Creek Flood Control Channel
Pinole Creek Greenway Project – Upper Reach
Pinole Creek Greenway Project – Lower Reach
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
Pacheco Marsh – 120 acre Tidal Wetland Restoration
Marsh Creek Reservoir
Marsh Creek Reservoir – 218 Acre Expansion
Strentzel Creek Meadow Grading Plan
Strenzel Creek Planting
Downtown Knightsen
Canada del Cierbo Mitigation
Canada del Cierbo Mitigation
    Collaboration – Collaboration -
            Collaboration

 Watershed Councils/Creek Groups
 Cities/Municipal Advisory Councils
 Neighborhood groups/property owners
 Contra Costa Watershed Forum
     Watershed   Atlas
Stormwater Program Role

 Coordinated development of HMP
 Stormwater C-3 Guidebook
 Case Studies/Research
 Education/Adaptive Training
 Stream and Wetlands System Protection
  Policy
Downtown Walnut Creek - 1958
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
Grayson Creek Channel - 1957
A New Approach

 HistoricDesign Concept
    - Protect structures and convey
      stormwater off as fast as possible
 New Design Concept
    - Protect structures and retain
      stormwater as long as possible
      Hydrograph Modification
           Management

 Increase retention time
 Increase stream stability
 Healthy sustainable watershed
 Cumulative improvement
The Impact of Impervious
       Surfaces
Stream Stability Approach

 Historical System
 Present System
 Compare Past and Present
 Understand Changes
 Recommendations and Restoration
  Templates
     Sustainable Watershed
                    Creek Stability/Function
                         (Geomorphology)




                         Community


Water Quality/Quantity                         Habitat
     (Hydrology)                               (Ecology)
The Future

   At the parcel level
     LID
     Homeowner  education
     Landscape contractors
    The Future

   At the Watershed level
      2nd generation facilities
      System preservation/
        replacement
      Clean Water Regional
        Treatment
      Regional retention facilities
      The 50 year plan

                                       Marsh Creek Reservoir
Remember you live in a
Watershed too………..




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          presentation/FC-Erosion Control