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Installation and Maintenance of Stormwater Treatment BMPs Workshop, December 2011
Stormwater BMP MaintenanceImportance
• Maintain the function of the BMP• Maintain environmental and habitat
benefits• Maintain appearance-public acceptance• Prevent costly future repairs
Installation and Maintenance of Stormwater Treatment BMPs Workshop, December 2011
Developing a Maintenance StrategyFacility Inventory
• Obtain maintenance plan and design documents
• Visit the site to review conditions, access
• Contact the local governmental jurisdiction
Installation and Maintenance of Stormwater Treatment BMPs Workshop, December 2011
Developing a Maintenance Strategy Work Plan
• Review facility inventory• Review maintenance guides• Create a list of activities,
equipment needed and cost• Review plan with owner and local
governmental officials• Modify or create checklist and
record keeping procedures• Assign and educate personnel• Implementation and evaluation
Installation and Maintenance of Stormwater Treatment BMPs Workshop, December 2011
Regular InspectionsLocation
• Upstream Parking Lots & Paved Areas• Upstream Unpaved Areas• Forebays• Main Treatment Area• Storm Sewer Pipes and Structures
Installation and Maintenance of Stormwater Treatment BMPs Workshop, December 2011
Regular InspectionsFrequency
• Weekly during establishment period• Weekly/monthly after establishment period• Complete when doing regular site maintenance• Some inspections should occur during rainfall• Some inspections should occur 24 hours after rainfall
Weeds and invasive species a few months after planting
Immediately after planting
During rain eventAfter establishment period
Installation and Maintenance of Stormwater Treatment BMPs Workshop, December 2011
Regular InspectionsVisual Assessment
• Trash and debris• Sediment accumulation• Bare soil and erosion• Plant coverage• Plant health
Trash and debris
Sediment accumulation
Plant coverage
Erosion
Plant Health
Installation and Maintenance of Stormwater Treatment BMPs Workshop, December 2011
Regular InspectionsVisual Assessment
• Soil moisture and percolation• Weeds and invasive species• Animal and insect damage• Mulch condition
Weeds and invasive species
2 months after planting
Soil percolation
Animal damage Mulch
Installation and Maintenance of Stormwater Treatment BMPs Workshop, December 2011
Periodic InspectionsFrequency
• Annually or as needed• Increase frequency to monitor
identified potential problems• During storm events
Installation and Maintenance of Stormwater Treatment BMPs Workshop, December 2011
Periodic InspectionsVisual Assessment
• Storm sewer pipe and structure condition
• Dam, embankment, overflow weir condition
• Stormwater Flow
Installation and Maintenance of Stormwater Treatment BMPs Workshop, December 2011
Periodic InspectionsTesting and Surveys
• Soil testing• Soil profile• Stormwater flow• Detention volume• Water testing
Installation and Maintenance of Stormwater Treatment BMPs Workshop, December 2011
Regular Maintenance ProceduresSoil Stabilization
• Establishment Period• Management Period• Repairs
Installation and Maintenance of Stormwater Treatment BMPs Workshop, December 2011
Regular Maintenance ProceduresClean Up – Trash and Debris
• Location• Equipment• Frequency• Disposal
Installation and Maintenance of Stormwater Treatment BMPs Workshop, December 2011
Regular Maintenance ProceduresClean Up – Sediment Removal
• Location (Upstream, Forebay, Structures, Ponding & Treatment Area)
• Equipment• Method (Avoid heavy equipment
of select soils)• Frequency• Disposal• Amount (All or partial)
Installation and Maintenance of Stormwater Treatment BMPs Workshop, December 2011
Regular Maintenance ProceduresPlant Density
• Facility age• Plant loss• Season• Plant spacing
Year 1 Year 2
Year 4
Installation and Maintenance of Stormwater Treatment BMPs Workshop, December 2011
Regular Maintenance ProceduresInvasive Species Removal –General
• Importance• Frequency• Environmentally sensitive practices• Plant identification-use photo guides
Installation and Maintenance of Stormwater Treatment BMPs Workshop, December 2011
Regular Maintenance ProceduresInvasive Species Removal –By Hand
• Method• Frequency• Weed species knowledge• Clean Up (removal of Biomass)
Installation and Maintenance of Stormwater Treatment BMPs Workshop, December 2011
Regular Maintenance ProceduresInvasive Species Removal –Mowing
• Equipment• Method• Height• Frequency• Edging• Clean Up (removal of Biomass)
Installation and Maintenance of Stormwater Treatment BMPs Workshop, December 2011
Regular Maintenance ProceduresInvasive Species Removal –Edging & Trimming
• Purpose• Equipment• Method• Frequency• Clean Up (removal of
Biomass)
Installation and Maintenance of Stormwater Treatment BMPs Workshop, December 2011
Regular Maintenance ProceduresInvasive Species Removal –Burning
• Benefits• Local regulations• Method (Spot and Large Area)• Frequency
Installation and Maintenance of Stormwater Treatment BMPs Workshop, December 2011
Regular Maintenance ProceduresInvasive Species Removal –Chemical
• Integrated Chemical Management• Product Selection• Timing• Method/Application
Installation and Maintenance of Stormwater Treatment BMPs Workshop, December 2011
Regular Maintenance ProceduresInvasive Aquatic Species Removal
• Cattails• Reed Canary Grass• Algae
Installation and Maintenance of Stormwater Treatment BMPs Workshop, December 2011
Regular Maintenance ProceduresInvasive Woody Species Removal
• Location• Equipment• Method• Frequency
Installation and Maintenance of Stormwater Treatment BMPs Workshop, December 2011
Regular Maintenance ProceduresPlant Maintenance
• Aesthetic Goals• Frequency• Plant Characteristics• Watering• Replacements• Disease
Installation and Maintenance of Stormwater Treatment BMPs Workshop, December 2011
Regular Maintenance ProceduresSoil Amendments
• Type (Organic vs Inorganic• Composition• Frequency• Application Rate• Adjacent Areas
Installation and Maintenance of Stormwater Treatment BMPs Workshop, December 2011
Regular Maintenance ProceduresPest Management
• Animal damage• Insects
Installation and Maintenance of Stormwater Treatment BMPs Workshop, December 2011
Stormwater BMP MaintenanceResources
• APWA MARC Maunal of Best Management Practices for Stormwater Quality, Mid America Regional Council, August 2009
• “Maintaining Stormwater Systems: A Guidebook for Private Owners and Operators”, Northern Virginia Regional Commission, January 2007
• “Practically Easy Landscape Maintenance: A Care Manual for Natural Drainage Systems”, Seattle Public Utilities, 2005
• “Landscape Guide for Stormwater Best Management Practice Design”, Metropolitan St Louis Sewer District, 2009
• “A Citizen’s Guide to Maintaining Stormwater Best Management Practices”, Lake County Stormwater Management Commission, October 2004
• “Stormwater Wet Pond and Wetlands Management Guidebook”, EPA 833-B-09-001 February 2009
• Stormwater BMPs Selection, Maintenance & Monitoring, Gordon England and Stuart Stein, July 2007
Installation and Maintenance of Stormwater Treatment BMPs Workshop, December 2011
Stormwater BMP MaintenanceQuestions?