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Detention Basin Retrofits and Detention Basin Retrofits and EnhancementsEnhancements
November 29, 2007 November 29, 2007
Kelly C. Karll, P.E.Kelly C. Karll, P.E.
Senior Civil EngineerSenior Civil EngineerMichigan Water Environment AssociationMichigan Water Environment Association
Innovative Solutions for Storm Water ManagementInnovative Solutions for Storm Water Management
If converting a detention pond from If converting a detention pond from thisthis……
Before Construction 2002
Benefits of RetrofittingBenefits of Retrofitting
NPDES Phase II NPDES Phase II ProgramProgramWater quality Water quality improvementsimprovementsChannel protectionChannel protectionNative riparian and Native riparian and wetland vegetationwetland vegetationHabitat enhancementHabitat enhancementProperty owner Property owner acceptance and acceptance and ownershipownershipStorm water educationStorm water educationLower maintenance Lower maintenance costscosts
NPDES Phase II ProgramNPDES Phase II Program
Water quality Water quality enhancementsenhancements
Sediment forebaySediment forebayOutlet controlOutlet control--first flushfirst flush
Channel protectionChannel protectionOutlet controlOutlet control--bankfullbankfull
Water Quality EnhancementsWater Quality Enhancements
Reduce nonReduce non--point sources of pollution such as point sources of pollution such as sediments, oils, grease, nutrients & pesticides.sediments, oils, grease, nutrients & pesticides.
Native VegetationNative Vegetation
Wetland vegetationWetland vegetationPond ZonePond Zone
Edge ZoneEdge Zone
Riparian bufferRiparian bufferUpland ZoneUpland Zone
Benefits of Native VegetationBenefits of Native Vegetation
FloatingFloating--leaved plants leaved plants cool watercool water
Emergent plants near Emergent plants near the edge provide the edge provide habitat and water habitat and water filtering filtering
Trees, shrubs, prairie Trees, shrubs, prairie and meadow plants and meadow plants stabilize soil on banks stabilize soil on banks and deterand deter geesegeese
Property Owner Acceptance & Property Owner Acceptance & Storm Water EducationStorm Water Education
NPDES Phase II NPDES Phase II Public education Public education planplan
StewardshipStewardship
Passive Recreational OpportunitiesPassive Recreational Opportunities
Bird watchingBird watching
Frog and toad surveysFrog and toad surveys
FishingFishingBluegill, Spotfin shiner, Banded killifish, Blackstripe topminnow, Brook silverside
Benthic surveysBenthic surveys
Nature photographyNature photography
Lower Maintenance CostsLower Maintenance Costs
Mow annually as Mow annually as opposed to weeklyopposed to weekly
Eliminate chemical Eliminate chemical treatmenttreatment
Minimize fountain Minimize fountain requestsrequests
Considerations for RetrofitsConsiderations for Retrofits
Outlet structure modificationsOutlet structure modifications
Addition of sediment Addition of sediment forebaysforebays
Modifications to eliminate shortModifications to eliminate short--circuitingcircuiting
Basin expansionsBasin expansions
Installation of outlet restrictorsInstallation of outlet restrictors
Installation of vegetative buffers and wetland Installation of vegetative buffers and wetland vegetationvegetation
Conversion of dry basins to wet basinsConversion of dry basins to wet basins
Factors to considerFactors to consider
Existing conditionsExisting conditionsProperty owner vs. Property owner vs. regulatory needsregulatory needsLand area constraintsLand area constraintsNonpoint source pollutantsNonpoint source pollutantsLongLong--term maintenance term maintenance expectationsexpectations
Frequency and duration of Frequency and duration of floodingflooding
Water depth and visibilityWater depth and visibility
Example Detention Basin RetrofitExample Detention Basin Retrofit
Ongoing ProblemsOngoing ProblemsAlgae GrowthAlgae Growth
Minimal Functioning Minimal Functioning Outlet PipeOutlet Pipe
Poor Water QualityPoor Water Quality
Invasive SpeciesInvasive Species
EnhancementsEnhancementsSediment ForebaySediment Forebay
New Outlet StructureNew Outlet Structure
Volunteer Planting Event Volunteer Planting Event
Wetland VegetationWetland Vegetation
Riparian BufferRiparian Buffer
Covington Square Subdivision, Canton TownshipCovington Square Subdivision, Canton Township
Construction ProcessConstruction ProcessCovington Square Subdivision, Canton TownshipCovington Square Subdivision, Canton Township
Example Detention Basin Example Detention Basin EnhancementsEnhancements
Detention Pond Buffer EnhancementsDetention Pond Buffer Enhancements
Example Detention Basin RetrofitExample Detention Basin Retrofit
Ongoing ProblemsOngoing ProblemsAlgae GrowthAlgae Growth
Plugged Outlet PipePlugged Outlet Pipe
EnhancementsEnhancementsNew Outlet StructureNew Outlet Structure
Volunteer Planting Volunteer Planting Event by Home OwnersEvent by Home Owners
Install Wetland Install Wetland VegetationVegetation
Construct Riparian Construct Riparian BufferBuffer
Meadowbrook Subdivision, Canton TownshipMeadowbrook Subdivision, Canton Township
Meadowbrook SubdivisionMeadowbrook Subdivision
Outlet Structure Outlet Structure ModificationsModifications
Meadowbrook SubdivisionMeadowbrook Subdivision
Outlet Structure Outlet Structure EnhancementEnhancement
Wetland & Buffer Wetland & Buffer PlantingsPlantings
Offer Opportunities to Enjoy Your Offer Opportunities to Enjoy Your Neighborhood AmenityNeighborhood Amenity
Park benches and Park benches and walking trailswalking trailsEducational signage Educational signage for homeownersfor homeownersCreate pondCreate pond--stewardship group stewardship group (kids and adults) to (kids and adults) to make maintenance make maintenance funfunHabitat Habitat opportunities (bird opportunities (bird boxes, logs)boxes, logs)