1.BMP Training Module 3 Rain Gardens and Bioretention Sponsored by: MARC Presenters: Andy Sauer, P.E. (CDM) Natalie Postel, P.E. (CDM)January 23, 2009

2. Agenda 8:30-9:30 Lecture 1: Overview of Rain Gardens & Bioretention Review Module 1 and WQv definition Define Bioretention Define Rain Gardens 10 minute break 9:40-10:30 Lecture 2: Design Examples Bioretention Rain Garden 15 minute break 10:45 11:30 Design Activity 11:30 11:45 Design Activity Results 11:45 12:00 Lecture 3: Other considerations Implementation Operations and maintenance Vegetation Lessons learned 3. Best Management Practice (BMP) Best State of the Practice No definitive answer Past experience, testing, research, Unique to site Management Responsible Parties Improve water quality, meet NPDES Phase II Jurisdictional specific Meet specific requirements of a regional Practice Action or Implementation Practice = defined to carry out, apply, or to do or perform often. 4. Basic BMP Principles Plan for stormwater management Mimic natural hydrology Sustainable and be green Provide a level of service Improve water quality Increase initial abstraction Promote infiltration, retention & ETTreat the stormwater runoff Natural processes Treatment trains 5. BMP Evaluation Process PLAN MIMIC TREAT Extended detention (40 hours) to increase treatment and decrease peak flows 6. TREAT Retain, Infiltrate, Evaporate, and ET Retain Infiltrate Vadose Zone SubsurfaceEvaporate At the sourceExcess standing waterEvapotranspiration (ET) Plant Uptake Transpiration 7. Structural BMP Consideration Pollutant removal efficiency Water quality volume Site suitability Tributary area (< 4 acres) Dimensions (depth, length-width ratio) Outlet Emergency spillway Maintenance easement Routine and non-routine maintenance 8. an QuererAesthetics/Amenityy titW atat WQu ali tyBMP Evaluation General Rule 9. BMP Manual 10. Post Development BMP Selection 11. BMP Level of Service Reduce Volume Infiltration Evapotranspiration (ET)Remove total suspended solids (TSS) SettlingTemperature Reduction Urban heat islandRemove oils and Floatables Screening and netting 12. BMP Selection Flowchart Level Of ServiceBMP Value RatingWater Quality Volume/sizingPlacement, maintenance 13. Water Quality Volume (WQv) Water Quality Volume (WQv): The storage needed to capture and treat 90% of the average annual storm runoff volumeWater Quality Storm: The storm event that produces 90% volume of all daily storms in a yearBioretention and rain garden design is based on the WQvWQv 14. Kansas City Water Quality Storm Young and McEnroe (http://kcmetro.apwa.net)Daily Precipitation (in)2. 72. 52. 31. 9 2. 11. 5 1. 71. 1 1. 30. 5 0. 7 0. 945 40 35 30 25 20 15 10 5 0 0. 1 0. 3Water Quality Storm = 1.37 in# of days > or=2003 Kansas City Precip events 15. Why Use the WQv to size BMP? Retain runoff long enough to get water quality benefits Infiltrate Maintain vegetationReducing erosive flows from smaller runoff events Less applicable 16. Water Quality Volume Calculation Two methods Short-Cut Method Sites < 10 acres Only 1 predominant cover typeSmall Storm Hydrology Method Larger or more heterogeneous drainage areas 17. WQv Calculation Short-Cut Method WQv = P*Rv P = 24 hour Water Quality Storm (inches) Rv = Volumetric run coefficient = 0.05+0.009(I) I = % site Imperviousness = 100% Rv = 0.95 WQv = 1.37 in * 0.95 = 1.3 in 18. WQv Calculation Water Quality Volume WQv = 1.37 in * 0.95 = 1.3 inDriveway Example 20 ft x 30 ft = 600 ft2 1.3 in / 12 x 600 ft2 = 65 ft3 (486 gal) 65 ft3 = 10 ft x 10 ft x 0.65 ftResidential Street Example (28 ft / 2) x 100 ft = 1400 ft2 1.3 in / 12 x 1400 ft2 = 152 ft3 (1135 gal) 152 ft3 = 10 ft x 10 ft x 1.52 ft 19. WQv Calculation Water Quality Volume WQv = 1.37 in * 0.95 = 1.3 inTypical Home Roof Area = 2,100 ft2 (varies)1.3 in / 12 x 2,100 ft2 = 227.5 ft3 (1,702 gal) Assume 4 downspouts with equal area 228 ft3 / 4 = 57 ft3 (426 gal) 57 ft3 = 10 ft x 10 ft x 0.57 ft 20. Typical Lot BMPs in ROW Insert Lot Layout Figure 970971970 972973969 21. Typical Lot BMPs in Private 970 971970 972973969 22. Questions? 23. BioretentionTopeka KS 24. What is bioretention? A BMP that utilizes natural chemical, biological, and physical properties of plants, microbes, and soils to filter, treat, and infiltrate stormwater runoff. Bioretention differs from a rain garden in that is has an engineered underdrain system. 25. Bioretention Plan viewPretreatment sheet flowUnderdrainBioretention soil mix High flow inletVegetation OutflowOverflow Weir 26. Bioretention Designed to filter WQv in 1-3 days High Flow Inlet (slanted grate in side slope preferred)Underdrain Cleanout Pollu ted Runof f3 Shredded Hardwood Mulch (free of debris)Bioretention Soil Mixture (BSM) 2.5ft 4ft45 Wye Fitting4 Min. HDPE Underdrain (min. slope 0.5%)Ponding Depth 6 TypicalGeotextile Fabric on top of #7 StoneGeotextile Fabric Under #57 StoneOverflow Weir Elevation 27. Bioretention 10 Min. Grass Filter Strip10-15 Min. (recommended)Curb Cut24 Rock Diaphragm3 Shredded Hardwood Mulch (free of debris)12 2.5 Min. Bioretention Soil Mixture (BSM)121112 Wide Geotextile Fabric on top of #7 Stone 4 Min. HDPE Perforated Underdrain Geotextile Fabric Under #57 Stone 28. Bioretention Pretreatment Sheet flow entering the site is best Concentrated flow requires energy dissipaters Decrease velocity Particle settlingOptions Baffle boxes Surge stone Filter StripsTopeka KS 29. Vegetative Pretreatment Sheet flow: Vegetated filter stripConcentrated flow: Vegetated channelFilter StripLeawood KSChannel Olathe KS 30. Pretreatment - Vegetated filter strip Acts as a pre-filter Reduces flow velocity Can be planted with native grass or turfKansas City MO 31. Pretreatment - Vegetated Channel Same benefits as filter strip Can be planted with native grass or turf 32. Bioretention Ponding Area Temporary storage as water filters through soil mixture Minimize depth required to hold WQv Maximize surface area for infiltrationLenexa KS 33. Bioretention Vegetation Water volume reduction through transpiration and increased infiltration through root pathways Pollutant and nutrient removal through plant uptake Broadleaf Arrowhead, Sagittaria latifoliaRobert H. Mohlenbrock @ USDANRCS PLANTS DatabaseLenexa KS 34. Bioretention Vegetation Types Should be tolerant to both extended wet and dry periods Aesthetics are important Approximately 6 species Native grasses and other ground cover 35. Bioretention Soil MixtureHigh Flow Inlet (slanted grate in side slope preferred)Underdrain Cleanout Pollu ted Runof f3 Shredded Hardwood Mulch (free of debris)Bioretention Soil Mixture (BSM) 2.5ft 4ft45 Wye Fitting4 Min. HDPE Underdrain (min. slope 0.5%)Ponding Depth 6 TypicalGeotextile Fabric on top of #7 StoneGeotextile Fabric Under #57 StoneOverflow Weir Elevation 36. Bioretention Soil Mixture (BSM) Appendix A contains specifications for BSM Must have permeability greater than 1 ft/day A mix of compost, planting soil, and sand Free of stones, stumps, roots Free of brush or seeds from noxious weeds Organic mulch layer to cover the BSM Prevents erosion of BSM, retains moisture, aids biological growth and decomposition, and filters pollutants Pine mulch, wood chips, or grass clippings should NOT be used 37. Bioretention UnderdrainHigh Flow Inlet (slanted grate in side slope preferred)Underdrain Cleanout Pollu ted Runof f3 Shredded Hardwood Mulch (free of debris)Bioretention Soil Mixture (BSM) 2.5ft 4ft45 Wye Fitting4 Min. HDPE Underdrain (min. slope 0.5%)Ponding Depth 6 TypicalGeotextile Fabric on top of #7 StoneGeotextile Fabric Under #57 StoneOverflow Weir Elevation 38. Bioretention 10 Min. Grass Filter Strip10-15 Min. (recommended)Curb Cut24 Rock Diaphragm3 Shredded Hardwood Mulch (free of debris)12 2.5 Min. Bioretention Soil Mixture (BSM)121112 Wide Geotextile Fabric on top of #7 Stone 4 Min. HDPE Perforated Underdrain Geotextile Fabric Under #57 Stone 39. Bioretention Underdrain Increases the soils ability to drainSoil remains in an aerobic state Increases number of appropriate plant speciesSurround with an aggregate followed by a sand layerClean out drain 40. Bioretention UnderdrainLenexa KS 41. Bioretention UnderdrainLenexa KS 42. Bioretention OutletAttach to underdrain and possibly high flow drainConnect to conventional storm water system or create a non-erosive outfall using energy dissipation structures 43. Bioretention High Flow Structures High Flow Inlet (slanted grate in side slope preferred)Underdrain Cleanout Pollu ted Runof f3 Shredded Hardwood Mulch (free of debris)Bioretention Soil Mixture (BSM) 2.5ft 4ft45 Wye Fitting4 Min. HDPE Underdrain (min. slope 0.5%)Ponding Depth 6 TypicalGeotextile Fabric on top of #7 StoneGeotextile Fabric Under #57 StoneOverflow Weir Elevation 44. Bioretention High Flow Structures A bigger concern in commercial areas Parking lot runoff Design to allow 1% event to pass through or around facility 10% storm passes through high flow inlet 1% storm passes through overflow weir Minimize ponding of water above WQv Options Yard drain catch basin Stabilized channel Weir 45. Bioretention High Flow StructuresLenexa KS 46. Bioretention High Flow StructuresTopeka KS 47. Bioretention Siting Considerations Off-line, outside of stream corridor Tributary area must be stabilized against erosion Not on fill sites or steep slopes (unless enhanced) Minimum 20 setback from maximum water surface to surrounding structures Use fences and landscaping to impede access as needed to protect public safety 48. Bioretention Siting Considerations Off-line, outside of stream corridor Tributary area must be stabilized against erosion Route stormwater around BMP until plants are established Not on fill sites or steep slopes (unless enhanced) Minimum 20 setback from maximum water surface to surrounding structures Use fences and landscaping to impede access as needed to protect public safety 49. Bioretention Installation Considerations Rototill bottom of excavation area to at least 6 inches prior to adding planting soil Except in areas that will support the underdrainsPlant vegetation in early spring to take advantage of spring rainsDo not bring on-line until plants are established (45 days minimum from planting date)Water plants as needed during the first year 50. Bioretention Maintenance Relatively low maintenance Biannual inspection Erosion of pretreatment areas Spot mulching Dead or diseased vegetation removal Trash removal Check Overflow structures Inspect for wet boggy areas 51. Bioretention Advantages Minimal land area requirements Flexibility in design themes Pollutant uptake by vegetation Groundwater recharge Reduction of downstream peak runoff rate and volume to be managed Creation of wildlife habitats Recreational and aesthetic benefits Reduction in downstream water temperature 52. Bioretention Disadvantages Sediment can quickly clog a bioretention facility Not suitable in areas with high water table (1-2 feet from ground surface) Flood control features are not easily incorporated Serve only small tributary areas (< 4 acres) BSM must meet soil specifications for permeability & to support plants Lenexa KS 53. Bioretention Lessons Learned Establishing Vegetation takes time (1-3 years) Erosion of banks can be significant Consider by-pass for first 2-6 months after construction based on vegetation growth Filter strip or other pretreatment before inflow increases performance 54. Questions? 55. Rain GardensLenexa, KS 56. Rain Gardens Small depression planted with native wetland and prairie vegetation Collect and infiltrate stormwater Can be placed in many settings Residential yards Public areas Commercial sites10,000 Gardens (www.rainkc.com) 57. Bioretention vs. Rain Gardens Similarities Collection and infiltration of rainwater water quality volume (WQv) Biomass removes pollutants by filtration and uptakeKansas City MO 58. Bioretention vs. Rain Gardens Differences Size of facility Max runoff area for a rain garden ~1 acreExcavation Bioretention soil mixture (BSM) versus on-site soils Engineered underdrain system 59. Rain Gardens in Public Areashttp://www.dof.virginia.gov/mgt/resources/pub-Rain-Garden-Tech-Guide_01.pdf 60. Rain Gardens in Residential Yards10,000 Rain gardens (www.rainkc.com)Maplewood, MN 61. Rain GardensVegetation Impervious Surface Grass bufferPonding Area Augmented Soilhttp://fairfaxcounty.gov/nvswcd/youyourland/landscape.pdf 62. Rain Garden Soil Existing soil may need to be augmented to increase permeability and encourage plant growth. Should be a combination of: Loam Sand ClayUMKC Rain garden Project 63. Rain Garden Vegetation Deep rooted native perennials provide greatest stormwater capture and infiltration Species should be tolerant of drought and periodic flooding 64. Rain Garden Mulch Cover soil and surround plants with a layer of mulch to reduce erosion, retain moisture and help filter pollutants Should be shredded hardwood not pineOlathe KS 65. Rain Garden Site Selection Existing low spot in yardWhere downspouts will drain into itSetback from building foundations by at least 10 ft10,000 Rain gardens (www.rainkc.com) 66. Rain Garden Maintenance Water plants about every other day for the first two to three weeks Once native plants are established, they require little or no additional wateringDo not fertilize Overgrowth results in plants falling over Fertilizer stimulates weed growth 67. Rain Garden Advantages Low cost Minimal excavation Promote infiltration near the source Lot level amenity Public education and outreach tool 68. Rain Garden Disadvantages Small contributing area (< 1 ac) Private property Performance can vary Long term implementation Require property owner maintenance 69. Questions? 10 minute break 70. Lecture 2: Design ExampleTopeka KS 71. Bioretention Pretreatment sheet flowUnderdrainBioretention soil mix High flow inletVegetation OutflowOverflow Weir 72. Bioretention Design Criteria Pretreatment Vegetated filter strip if runoff enters as sheet flow Vegetated channel if runoff is concentrated or channelized Other options availablePlanting soil bed and ponding area Underdrain Overflow Vegetation 73. Bioretention Design Example Design a bioretention BMP to treat a 0.5 acre parking lot. Use the Bioretention Soil Mixture (BSM) specifications detailed in Appendix A. 74. Water Quality Storage Volume Bioretention Design Procedure Formi. ii.Tributary area to bioretention cell = 0.5 acres Calculate water quality storage volume 75. Water Quality Storage Volume ii.Calculate Water Quality Storage Volume (WQv) Short-Cut Method WQv = P*Rv P = 24 hour Water Quality Storm (inches) P = 1.37 inches (Kansas City) Rv = Volumetric runoff coefficient = 0.05+0.009(I) I = % site imperviousness 76. WQv Example Short-cut Method Given: A Tributary = 0.5 acres %impervious = 99% WQv = P * Rv*Area= (1.37in)*(1ft/12in) * (0.05 + 0.009 * 99%)*0.5 ac 77. Bioretention Pretreatment For sheet flow use a vegetated filter strip For concentrated flow use a vegetated channel 78. Bioretention Vegetated filter stripLfs 79. Bioretention Vegetated filter strip Determine the maximum inflow approach length, equal to overland flow length from tributary area Use the following table to identify minimum filter strip length (Lfs) slopes 2%. Slope not to exceed 6 percentTable 13 Pre-treatment Filter Strip Sizing Guidance Parameter Impervious Parking Residential Lawns Lots Maximum inflow approach length (feet)35Filter strip slope 2% 2%Filter strip minimum length (feet)1075152 % 2075150 2% 2% 2% 2% 2% 2510121518 80. Bioretention Vegetated filter strip Table 13 Pre-treatment Filter Strip Sizing Guidance ParameterImpervious Parking LotsMaximum inflow approach length (feet) Filter strip slope Filter strip minimum length (feet)35 2% 10Residential Lawns7575 2% 2% 2% 152025 2% 10150 2% 2% 2% 121518 81. Bioretention Vegetated Channel 82. Bioretention Vegetated channel Determine the percent imperviousness of the tributary area This can be different than the %impervious used for the WQv calculationUse Table 14 to identify minimum length (LVC) for channels slopes 2% Slope not to exceed 6 percentTable 14 Pretreatment Grass Channel Sizing Guidance for a 1.0-Acre Tributary AreaParameter Channel Slope Grass Channel Minimum Length (feet) 33% Impervious34% to 66% Impervious 67% Impervious 2% 2% 2% 2% 2% 2%254030453550 83. Bioretention Vegetated channel Table 14 Pretreatment Grass Channel Sizing Guidance for a 1.0-Acre Tributary AreaParameter Channel Slope Grass Channel Minimum Length (feet) 33% Impervious34% to 66% Impervious 67% Impervious 2% 2% 2% 2% 2% 2%254030453550 84. Bioretention Planting soil bed and ponding area 85. Bioretention Planting Soil Bed Set planting soil bed depth (df) Must be between 2.5 to 4 feet Soil bed must be 4 inches deeper than the bottom of the largest root ballTest soil permeability (k) Must be at least 1 ft/day 86. Bioretention Ponding Area Set max water ponding depth (hMAX) Between 3 to 6 inches (hMAX = HWQ)Calculate average water ponding depth (h) h = hMAX / 2 87. Bioretention Planting Soil Bed and Ponding Area Max (K) Measured Max = 0.5 / 2 88. Bioretention Planting Soil Bed and Ponding Area Select time for WQV to filter through planting soil bed (tf) 3 days is recommendedCalculate required filter bed surface area (Af) Af = (WQv * 43,560 * df) / [K * tf * (havg + df)] 89. Bioretention Planting Soil Bed and Ponding Area Calculate length and width of bed Length = (L:W Ratio * Af)0.5, L:W must be > 2Width = (W:L Ratio * Af)0.5, W:L must be < 0.5Ensure that length > 40 ft and width > 15 ft 90. Bioretention Planting Soil Bed and Ponding Area= (0.0537*43,560*4)/[1.0*3*(0.25+4)]= (2*735)1/2 = 38 = 735/40 91. Bioretention Underdrain 92. Bioretention Underdrain Pollu tedUnderdrain Cleanout Runo ff3 Shredded Hardwood Mulch (free of debris)Bioretention Soil Mixture (BSM) 2.5ft 4ft45 Wye Fitting4 Min. HDPE Underdrain (min. slope 0.5%)Geotextile Fabric on top of #7 StoneGeotextile Fabric Under #57 Stone 93. Bioretention Underdrain Set underdrain diameter (Du) At least 4 inchesnPERF >= 4Use at least 4 perforations rows around the drain pipe (nPERF)Use perforation diameter (DPERF) of at least 0.375 inchesDu = 4 inchesUse a longitudinal spacing between perforations (SPERF) of 6 inches on centerSet depth of gravel blanket around underdrain At least 8 inches and greater or = Du + 2 inchesDPERF = 0.375 inches 94. Bioretention Underdrain 680.3756 5 95. Bioretention Underdrain Ensure underdrain grade is at least 0.5 percentProvide a clean-out for each pipe run or every 50Provide a valve or cap at end of underdrain Longer retention of water for plant uptake and groundwater rechargeConnect underdrain to stormwater system or suitable outfall 96. Bioretention Underdrain If planting soil bed width > 20 ft, then add transverse collector pipes Spacing of transverse collector pipes (Su) < 10 ft Number of transverse collector pipes (npipe) = planting soil bed length / SuFor example: npipe = 120 ft / 10ft = 12 transverse collector pipes 120ft60ft10ft 97. Bioretention Underdrain NONA0 0.5YES 98. Bioretention Overflow Bioretention BMPs must be able to safely route or bypass runoff up to the 1% event If the 1% event is routed through, flow velocity must be kept below 3 fps to prevent erosion If a bypass is used, it must be able to route all events up to and including the 1% event Overflow can be a vegetated or stabilized channel or a yard inlet catch basinTopeka KSCUMKC Rain garden Project 99. Bioretention OverflowHigh Flow Inlet (slanted grate in side slope preferred) 1% Storm Pollu ted R10% Storm unof fWQvBioretention Soil Mixture (BSM) 2.5ft 4ftOverflow Weir Elevation 100. Grading Side slopes 4:1 or flatter for entire bioretention or rain garden areaUMKC Rain Garden Project 101. Bioretention Vegetation Purpose Removal of water by evapotranspiration Creation of infiltration pathways via root development Pollutant uptake Aesthetic valueSpecify Species Amount SpacingTopeka KS 102. Bioretention Vegetation Plant a mix of Redbud and White Mulberry with 6-foot spacing between trunks and at least 6 feet from facility edges. Plant an even mix of Yellow Coneflower, little bluestem, and side-oats grama with 2-foot spacing between plants. Plant Indiangrass in and around other species to fill out facility. These species are perennial and tolerant of dry and wet conditions and sunlight. This mix provides a multi-layered canopy and aesthetic appearance from green, yellow, purple, and white flowers. 103. Bioretention Maintenance Similar to any landscaped area Inspect overflow structures Inspect, prune, remove vegetation Inspect for erosion Spot mulch Remove trash Inspect after storm events > 0.5inTopeka KS 104. Questions? 105. Rain GardensUMKC rain garden Project 106. Rain Gardens 107. Rain Gardens 108. Rain GardensVegetation Impervious Surface Grass bufferPonding Area Augmented Soil 109. Rain Garden Design Sites Maximum drainage area is ~ 1 acre Garden should be at least 30% as large as impervious areaTypical sites Residential yards Community areas10,000 Rain Gardens (www.rainkc.com) 110. Rain Garden Design Sites Minimum of 10ft from structuresShould complement natural drainage of areaKansas City MO 111. Rain Garden WQv Same Water Quality Volume calculation as Bioretention Use short-cut method 112. Regional Soil Classifications 113. Rain Garden Max Depth USDA Soil Texture Classification(Ksat) Infiltration Rate (in/hr)24 hr Max Ponding Depth (in)48 hr Max Ponding Depth (in)Sand9.28222.6445.2Loamy Sand2.3556.5113.0Sandy Loam0.8620.641.2Loam0.5212.524.9Silt Loam0.276.412.9Sandy Clay Loam0.122.85.7Clay Loam0.081.93.8Silty Clay Loam0.081.93.8Sandy Clay0.051.12.3Silty Clay0.040.91.9Clay0.020.61.1 114. Clayey Soil Infiltration RatesThree dimensional plot of infiltration rates for clayey soil conditions. (Pitt, et. al, 2002) 115. Sandy Soil Infiltration RatesThree dimensional plot of infiltration rates for sandy soil conditions. (Pitt, et. al, 2002) 116. Building a Rain Garden Volume Ponding depth of WQv is dependent on the soils (Typically 4-6 inches)Ponded water should be infiltrated within 24-48 hrsA slightly deeper area can be incorporated to hold water longerSide slopes should be flatter than or equal to 4:1 117. Rain Garden Soil Amend clay soils with organic material to improve drainage Loam, peat, compost SandAdd a 3 inch layer of untreated, shredded hardwood mulch 118. Rain Garden Vegetation 119. Rain Garden Vegetation 120. Rain Garden Vegetation Other resources Appendix A in BMP manual 10,000 Rain Gardens www.rainkc.com 121. Rain Garden Maintenance Biannually Inspect for erosion MulchAnnually Year 1Inspect spillway Prune, remove, inspect vegetationYear 5Similar to Bioretention St. Stephens School, Alexandria Virginia 122. Questions? Break (15 minutes) 123. Bioretention Design Activity 124. Activity Design a bioretention area to capture the WQv from a 2 acre tributary area with 85 % imperviousness. Stormwater enters the facility as sheetflow off impervious surfaces with a maximum inflow length of 75 feet. Use the BSM specified in Appendix A to determine the dimensions of the bioretention area. 125. Activity Solution 126. Lecture 3: Follow up, Lessons Learned, Review CriteriaKansas City MO 127. Follow up, Review Criteria, Maintenance, Plants Phases of BMP development Key points of emphasis for each party Preliminary Plan Final Plan Construction Operation and Maintenance Designer Reviewer StakeholderMaintenance 128. Designer Review TeamPlanning Phase Environmental Site Assessment Select Post Construction BMPs Flood Control Study Establish Long-term Maintenance AgreementsPlat ApprovalPlanning Engineering Parks & Recreation Environmental Specialists AttorneyDesign Phase Erosion and sedimentation controls Post-construction BMPs Flood control improvementsBuilding Permit Review Team Planning Engineering Code Compliance InspectorsReview Team Planning Engineering Parks & Recreation Environmental Specialists Operations & MaintenanceConstruction Phase Inspect and maintain BMPs for construction activities Construct Post Construction BMPs Maintain agreements for post-construction BMPsOccupancy Permit 129. General Maintenance Event Inspection (> 0.5 inches) Inspect facility operation, especially outlet structure Remove trash & debris Document potential problems Monthly Inspection Inspect & repair erosion Water plant material during dry periods (1st Year) Perform routine plant maintenance (pruning, weeding, etc.) Semi-Annual Inspection Remove and replace dead or diseased vegetation Re-landscape/re-mulch any area areas Annual Inspection Inspect inlet & outlet structure condition Record assessment of planted species & evidence of invasive plant species Perform comprehensive safety inspection 130. Other Maintenance Consideration Maintenance access - 15 feet wide strip around the perimeter of the site May need to harvest excess plants Erosion issues Sedimentation Remove trash/floatablesOlathe KS 131. Vegetation Use plants listed in the BMP Manual Appendix A Recommended Plant Materials for BMPs Narrow down from this list by: Native/Non-Native Treatment only, habitat creation / biodiversity, aesthetics? Evaluating site conditions - soil quality, climate, wetness, pollution Hardier plants would work better in areas with poorer site conditions 132. Vegetation Narrow down from this list by (cont): Speaking with local nursery or botanists What plants are available for purchase? Which plants have the best survivability? Which plants would be best candidates for wet areas, variable moisture, poor soils, etc.?Visit at natural wetland in the area What plants are naturally favored in local area? Are there specific invasive species that need to be managed?Check municipal codes to ensure all plant materials are approved for the area 133. Native versus Non-native Plants Native plants are recommended Adapted to environmentgrowing season corresponds to wet season Dense, deep root system Increase infiltration More drought tolerant Disease resistant 134. Vegetation Resources http://plants.usda.gov Appendix A in the MARC BMP manual Local nurseries www.kansasnativeplantsociety.org www.grownative.org 135. Upcoming Training SessionsModule #4 Extended Dry Detention & Infiltration (Pervious Pavements) Date: February 20, 2009 Location: Helzberg Auditorium, KCPL 136. Questions?