Detention Basin Retrofits and Detention Basin Retrofits and Enhancements Enhancements November 29, 2007 November 29, 2007 Kelly C. Karll, P.E. Kelly C. Karll, P.E. Senior Civil Engineer Senior Civil Engineer Michigan Water Environment Association Michigan Water Environment Association Innovative Solutions for Storm Water Management Innovative Solutions for Storm Water Management
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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
……could result in this?could result in this?
……or this?or this?
Or retrofitting a pond from thisOr retrofitting a pond from this……
Before Construction 2002
……to this?to this?
After Construction July 2005
Or from thisOr from this……
……to this?to this?
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
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
Habitat EnhancementHabitat Enhancement
Property Owner Acceptance & Property Owner Acceptance & Storm Water EducationStorm Water Education
NPDES Phase II NPDES Phase II Public education Public education planplan
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
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)
Opportunities are numerousOpportunities are numerous……