Stormwater Infrastructure Management Storm Drainage Infrastructure Reinvestment Program Water Asset Management Conference December 3, 2015 Arlington, VA Department of Public Works and Environmental Services Working for You! A Fairfax County, VA, publication December 2015
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Department of Public Works and Environmental Services
Working for You!
A Fairfax County, VA, publicationDecember 2015
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Agenda
• History of County Stormwater Codes• Stormwater Program Vision• County Asset Management Responsibilities• Elements of STAMP (Stormwater Asset Management Program)
• Growing Process• Challenges
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History of County Stormwater CodesNuisance flooding
Pro Rata Share
Erosion & Sediment Control1940s Clean
Water Act
Floodplain Protection1950s 1960s 1970s1980s
2000s
1990s
2010s
Ches Bay Act
Regional Stormwater
Management WSPOD
GASB
NPDES-MS4
permittingDam
Standards
Stormwater Tax
Stormwater Management
OrdinanceTMDLs
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Stormwater Program Vision
Implement a comprehensive sustainable asset management program for the
effective operation, maintenance and reinvestment of storm conveyance and
stormwater management components in our community.
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Because things like these…
…result in these
Why we do this
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Fairfax County• 399 sq. miles• 1.1 million population• 30 watersheds to
Potomac and Occoquan Rivers
• Phase I MS4 community – Since 1997– TMDLs
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County Storm System• Residential areas• Through drainage
on commercial, industrial and institutional sites
• Integrated with the road drainage system, VDOT responsibility
• No driveway culverts or floodplain crossings
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County Asset Management Responsibilities
60,000 storm drainage structures 1,300 miles of storm pipe 90 miles of man-made channels 1,600 publically maintained
stormwater management facilities Inspections of 4,400 privately
maintained stormwater management facilities
20 State regulated dams No CSOs
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Elements of County STAMP
Inventory
Condition
Assessment
Risk Analysis
& Prioritiz
ation
Reinvestment
Initial Acquisition
Retire
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Challenges• Contract procurement – innovative solutions take time
• Staff training and technology – a good investment
• Emergency response – unpredictable, takes us off task, delays schedules
• Flexibility is an asset– Be willing to change direction, accommodate citizen/political expectations– Build a scalable program to accommodate fluctuating funding/budgets
• Realize the differences in rehabilitation methods– Environmental impacts – styrene– Contract line items – influenced by lateral connections and liner thickness– Bypass/flow control – may or may not be necessary – The shorter storm pipe segments impact mobilization and set-up costs as
compared to wastewater systems
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Wastewater & Storm System Structural DifferencesFeature Wastewater System Storm System