flood control and erosion control in contra costa county streams stormcon workshop may 12, 2006 san...
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![Page 1: Flood Control and Erosion Control in Contra Costa County Streams StormCon Workshop May 12, 2006 San Ramon, California Mitch Avalon Contra Costa County](https://reader035.vdocuments.us/reader035/viewer/2022062713/56649f525503460f94c762ec/html5/thumbnails/1.jpg)
Flood Control and Erosion Control in Contra Costa County Streams
StormCon WorkshopMay 12, 2006San Ramon, California
Mitch 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 channel Manage regional detention basins Watershed-wide planning C-3/HMP regional facilities
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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
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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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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 levelLIDHomeowner educationLandscape contractors
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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
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G:grpdata/admin/mitch/pp presentation/FC-Erosion Control
Remember you live in a Watershed too………..