Flood Control and Erosion Control in Contra Costa County Streams
StormCon WorkshopMay 12, 2006San Ramon, California
Mitch AvalonContra 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
Green Valle
y Ck
Ala
mo
Ck
Wes
tSycamore Ck
San Ramon Ck
San
Ram
on C
k
Las Trampas Ck
Upp
er Pine C
k
Galindo Ck`G
rays
on
&
Mu
rder
ers
Cks
Pach
eco
Ck
Rodeo CkPinole CkGarrity
CkRheem CkSan Pablo Ck
Wildcat Ck
East Antioch Ck
Mar
sh C
k
Sand Ck
Deer Ck
Dry Ck
Kello
gg C
k
Marsh Ck Reservoir
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
Unconfined Groundwater Recharge Basin
2005
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
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
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
Community
Water Quality/Quantity
(Hydrology)
Habitat
(Ecology)
Creek Stability/Function
(Geomorphology)
The Future
At the parcel levelLIDHomeowner educationLandscape 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
G:grpdata/admin/mitch/pp presentation/FC-Erosion Control
Remember you live in a Watershed too………..
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