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Urs, stormwater bmp construction
 

Urs, stormwater bmp construction

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This is a presentation given at the 2011 Stormwater BMP Installation and Maintenance Workshop, sponsored by the Johnson County, Kansas Stormwater Management Program, and held at Johnson County ...

This is a presentation given at the 2011 Stormwater BMP Installation and Maintenance Workshop, sponsored by the Johnson County, Kansas Stormwater Management Program, and held at Johnson County Community College in December.

Two files have been posted. The first presentation illustrates how urbanization changes our landscape and the way water moves through it, the consequences of those changes, and how green infrastructure can help restore ecological function to the built environment.

The second presentation (this one) is an introduction to rain garden and bioretention construction for commercial applications (rather than residential yards).

These materials were developed by the URS Green Solutions Team in Kansas City. Feel free to contact us with any questions about these materials.

David Dods, Senior Environmental Engineer, david.dods@urs.com, 913.344.1022
Jessi Veach, Civil Engineer, jessi.veach@urs.com, 913.344.1029
Todd Bond, P.E., Senior Civil Engineer, todd.bond@urs.com, 913.344.1010
David Kocour, Environmental Scientist, david.kocour@urs.com, 913.344.1058

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    Urs, stormwater bmp construction Urs, stormwater bmp construction Presentation Transcript

    • Rain Garden and Bioretention Construction: Excavation, Grading, & Structures (presentation 2 of 2)Photos: David Dods, URS David Dods URS, Overland Park, Kansas 914.344.1022, david.dods@urs.com Installation and Maintenance of Stormwater Treatment BMPs Workshop, December 2011
    • This is a presentation given at the 2011 Stormwater BMP Installation and Maintenance Workshop, sponsored by the Johnson County, Kansas Stormwater Management Program, and held at Johnson County Community College in December. Two files have been posted. The first presentation illustrates how urbanization changes our landscape and the way water moves through it, the consequences of those changes, and how green infrastructure can help restore ecological function to the built environment. The second presentation (this one) is an introduction to rain garden and bioretention construction for commercial applications (rather than residential yards). These materials were developed by the URS Green Solutions Team in Kansas City. Feel free to contact us with any questions about these materials. David Dods, Senior Environmental Engineer, david.dods@urs.com, 913.344.1022 Jessi Veach, Civil Engineer, jessi.veach@urs.com, 913.344.1029 Todd Bond, P.E., Senior Civil Engineer, todd.bond@urs.com, 913.344.1010 David Kocour, Environmental Scientist, david.kocour@urs.com, 913.344.1058Installation and Maintenance of Stormwater Treatment BMPs Workshop, December 2011
    • If you need information for residential yards, look for “The Blue Thumb Guide to Raingardens, Design and Installation for Homeowners in the Upper Midwest” by Schmidt, Shaw, and Dods Image: Waterdrop InnovationsInstallation and Maintenance of Stormwater Treatment BMPs Workshop, December 2011
    • Topics Earthwork & Structures • Pre-Excavation • Excavation & Grading • Rain Gardens vs. Bioretention • Restoring & Placing Soils • Underdrains, Outlets, Inlets Landscaping • Fine Grading • Planting & Mulch • Edging & Finishing TouchesInstallation and Maintenance of Stormwater Treatment BMPs Workshop, December 2011
    • Pre-Excavation Basic BMP Project Goals: 1. Catch stormwater & promote infiltration 2. Establish healthy, lush vegetation So, we want to: • Preserve existing vegetation • Prevent soil compaction • Prevent garden clogging Photo: David Dods, URSInstallation and Maintenance of Stormwater Treatment BMPs Workshop, December 2011
    • Equipment Staging Don’t drive or park on/near garden Photo: David Dods, URSInstallation and Maintenance of Stormwater Treatment BMPs Workshop, December 2011
    • Tree Protection Minimize work/disturbed areas Preserve the existing landscape Stay off tree roots Photos courtesy of Rusty Schmidt, Washington Conservation District, Stillwater, MNInstallation and Maintenance of Stormwater Treatment BMPs Workshop, December 2011
    • Erosion Control Mud and sediment ruin BMPs Stabilize site upstream of BMP before starting work Block inlet to BMP Keep erosion & sediment controls in-place at all times Photo: David Dods, URSInstallation and Maintenance of Stormwater Treatment BMPs Workshop, December 2011
    • Test Pits/PotholesHelpful to see subsurface conditions, ifnot done in design stage• Soil Type, Compaction, Debris Photo: David Dods• Depth to Bedrock, Groundwater• Utilities Asphalt layers Photo: Kurt Leuthold, Barr EngineeringInstallation and Maintenance of Stormwater Treatment BMPs Workshop, December 2011
    • DefinitionsInstallation and Maintenance of Stormwater Treatment BMPs Workshop, December 2011
    • Rain Garden Illustration: Craig Drummond, URS • Native soil • Typically shallow • Requires space • Promoting InfiltrationInstallation and Maintenance of Stormwater Treatment BMPs Workshop, December 2011
    • Rain Garden Photo: David Dods, URSInstallation and Maintenance of Stormwater Treatment BMPs Workshop, December 2011
    • BioretentionBioretentionSoil Mix Underdrain Illustration: Craig Drummond, URS • Engineered soil • Underdrain • Typically deeper, so can use less area • Filters runoff + promotes infiltration Installation and Maintenance of Stormwater Treatment BMPs Workshop, December 2011
    • Bioretention Photos: Rusty SchmidtInstallation and Maintenance of Stormwater Treatment BMPs Workshop, December 2011
    • In-Line vs. Off-Line In-Line Off-LineInstallation and Maintenance of Stormwater Treatment BMPs Workshop, December 2011
    • In-Line vs. Off-Line Design Photos: David Dods and Rusty Schmidt, URSInstallation and Maintenance of Stormwater Treatment BMPs Workshop, December 2011
    • Excavation & Grading – Rain Gardens • Cut sod • Excavate to rough depth • Restore compacted soil • Add compost and rototill • Fine grading Photo: Kevin Slates, URSInstallation and Maintenance of Stormwater Treatment BMPs Workshop, December 2011
    • Sod Removal • Use sod cutter instead of heavy equipment, if possible • Reduce soil compaction • Reuse sod elsewhere Photo: David Dods, URSInstallation and Maintenance of Stormwater Treatment BMPs Workshop, December 2011
    • Excavation Excavate from edge when Keep equipment out of garden space allows to avoid soil compaction Photos: David Dods, URSInstallation and Maintenance of Stormwater Treatment BMPs Workshop, December 2011
    • Excavation • It is easier to stay out of small gardens • Low Ground Pressure equipment, if available, may help reduce compaction in large gardens Photo: DRG Engineers Photo: David Dods, URSInstallation and Maintenance of Stormwater Treatment BMPs Workshop, December 2011
    • Soil Compaction Ruins Rain Gardens Photos: David Dods, URS Excavated with a Skid Loader. Small rototiller was unable to solve compaction Fix: Hand dig, install drain pipe, change plant selections to more wet tolerant speciesInstallation and Maintenance of Stormwater Treatment BMPs Workshop, December 2011
    • Inlets, Outlets, & Concrete Work Typically installed after rough grading or before excavation Photos: David Dods, URSInstallation and Maintenance of Stormwater Treatment BMPs Workshop, December 2011
    • Restoring Compacted Soil Rip or overdig to break up compaction Photo: Rusty Schmidt Photos: David Dods, URSInstallation and Maintenance of Stormwater Treatment BMPs Workshop, December 2011
    • Add Compost and Till Photos: David Dods, URSInstallation and Maintenance of Stormwater Treatment BMPs Workshop, December 2011
    • Hand Tilling on Small Site Photo: David Dods, URSInstallation and Maintenance of Stormwater Treatment BMPs Workshop, December 2011
    • Fine Grading• Rake by hand on small sites• Drag on large sites• Keep heavy equipment off after restoring soil Photo: David Dods, URSInstallation and Maintenance of Stormwater Treatment BMPs Workshop, December 2011
    • ? Questions About Rain Garden Grading ?Installation and Maintenance of Stormwater Treatment BMPs Workshop, December 2011
    • Bioretention Illustration: Craig Drummond, URS • Excavate similar to rain garden, but deeper • Install underdrain • Rip & till compacted soil • Backfill with engineered soilInstallation and Maintenance of Stormwater Treatment BMPs Workshop, December 2011
    • Bioretention: Rough Grading & Underdrain Photos: Rusty SchmidtInstallation and Maintenance of Stormwater Treatment BMPs Workshop, December 2011
    • Bioretention: Underdrain Installation Photos: Rusty SchmidtInstallation and Maintenance of Stormwater Treatment BMPs Workshop, December 2011
    • Bioretention: Underdrain Connection to Storm Drain Photo: Rusty SchmidtInstallation and Maintenance of Stormwater Treatment BMPs Workshop, December 2011
    • Bioretention: Soil Mix Placement Cleanout Riser Photo: Rusty SchmidtInstallation and Maintenance of Stormwater Treatment BMPs Workshop, December 2011
    • Bioretention: Planting bed final grade Photo: Rusty SchmidtInstallation and Maintenance of Stormwater Treatment BMPs Workshop, December 2011
    • Bioretention DiscussionPipe & Gravel Types Gravel: Clean, Double Washed Filter Fabric Photos: Rusty Schmidt Flow Control on Outlet Pipe Installation and Maintenance of Stormwater Treatment BMPs Workshop, December 2011
    • Outlets Safely overflow large storms Grading and elevations are important for success Photos: David Dods, URSInstallation and Maintenance of Stormwater Treatment BMPs Workshop, December 2011
    • Restoring Compacted Soil & Backfilling • Install underdrain • Mark drain location with stakes • Rip compacted soil • Place 4 - 6” of engineered soil • Rototill to blend native and sandy soil • Place remaining soil lifts • Tele-Belt may be useful on large sites • Some specs require watering between lifts to settle soil Photo: Rusty Schmidt, URS • Rake to gradeInstallation and Maintenance of Stormwater Treatment BMPs Workshop, December 2011
    • Test Infiltration Before Planting• If drainage problems show up, it is easier to fix before planting• Touch up soil level if excessive settling Photo: Carla DodsInstallation and Maintenance of Stormwater Treatment BMPs Workshop, December 2011
    • Bad Soil Mix Installer substituted on-site soil for compost in the mix to save money Fix: Remove and replace everything Photo: Rusty SchmidtInstallation and Maintenance of Stormwater Treatment BMPs Workshop, December 2011
    • Engineered Soil • Typical mix: sand, compost, topsoil • Specs vary for different goals • Slow vs. fast infiltration • Plant choices • Variations include: • Mix percentages • With or without topsoil • Coarseness of sand • Compost vs. peat mossInstallation and Maintenance of Stormwater Treatment BMPs Workshop, December 2011
    • Engineered Soil – Typical Mix Ranges Material % by % by Weight Volume Sand 50 – 80 % 80 – 90% Compost 10 – 30 % Topsoil/Planting Soil 0 - 30% Fines (silt, clay) 5 - 15%, with clay <5% Organic Matter Content 3 – 5%Installation and Maintenance of Stormwater Treatment BMPs Workshop, December 2011
    • Engineered Soil Topics to discuss with designer: • Mix by volume vs. weight • Sand: fine vs. coarse • Compost: Well aged, mature product; Allowable sources • Topsoil: Allowable sources, weed seedsInstallation and Maintenance of Stormwater Treatment BMPs Workshop, December 2011
    • Engineered Soil – Infiltration Test 70% Sand, 70% Sand, 30% Peat 15% Peat, 15% Topsoil David’s Home Soda Bottle Infiltrometer Photo: David DodsInstallation and Maintenance of Stormwater Treatment BMPs Workshop, December 2011
    • Time: 0 Minutes Photo: David DodsInstallation and Maintenance of Stormwater Treatment BMPs Workshop, December 2011
    • Time: 5 Minutes Photo: David DodsInstallation and Maintenance of Stormwater Treatment BMPs Workshop, December 2011
    • Time: 30 Minutes Sand & PeatMix Drained in 7 Minutes Photo: David Dods
    • Time: 2 Hours Sand, Peat & Topsoil Mix: 17 hours to drain Photo: David DodsInstallation and Maintenance of Stormwater Treatment BMPs Workshop, December 2011
    • Inlets: Control water flow into garden to prevent erosion Should extend to low point of garden Photos: David Dods, URSInstallation and Maintenance of Stormwater Treatment BMPs Workshop, December 2011
    • Inlets Forebay to Collect Sediment & Debris Photos: David Dods, URSInstallation and Maintenance of Stormwater Treatment BMPs Workshop, December 2011
    • Sump Catch Basin with Pipe into Rain GardenSumpIllustration: Courtesy of Kurt Leuthold, Barr Engineering Installation and Maintenance of Stormwater Treatment BMPs Workshop, December 2011
    • InletsIf garden is designed forsheet flow down banks,you should see sod orerosion control blanketon sideslopesFlowing water will causeerosion, even on smallslopes Photos: David Dods, URSInstallation and Maintenance of Stormwater Treatment BMPs Workshop, December 2011
    • Fine Grading, Landscaping Introduction, & Finishing TouchesPhoto: Carla Dods Photos: David Dods, URS David Dods URS, Overland Park, Kansas 914.344.1022, david.dods@urs.com Installation and Maintenance of Stormwater Treatment BMPs Workshop, December 2011
    • Fine Grading What’s wrong with the grading here? Photos: David Dods, URSInstallation and Maintenance of Stormwater Treatment BMPs Workshop, December 2011
    • Fine Grading What’s wrong with the grading here? Low Point is not in channel Channel should be this shape Photos: David Dods, URSInstallation and Maintenance of Stormwater Treatment BMPs Workshop, December 2011
    • Fine Grading Water will flow to the lowest point Inches matter – Fine grading is critical to success. At inlet, outlet, edges, bed. If grading plan is unclear, Photo: David Dods, URS talk to designerInstallation and Maintenance of Stormwater Treatment BMPs Workshop, December 2011
    • Planting Zones Edges: Dry Sides: Average Bottom: MoistIllustration: Dan Shaw, Waterdrop Innovations,Source: The Blue Thumb Guide to Raingardens, bySchmidt, Shaw, and DodsInstallation and Maintenance of Stormwater Treatment BMPs Workshop, December 2011
    • Planting Zones • Different locations in gardens are wet or dry • Plants are chosen for specific locations • Plants need to go where specified • Please don’t substitute Photo: David Dods, URS without talking to designerInstallation and Maintenance of Stormwater Treatment BMPs Workshop, December 2011
    • Bioretention • Well-drained environment • Likely dries out faster than rain garden • So different plants may be Illustration: Kurt Leuthold, Barr Engineering used than in rain gardensInstallation and Maintenance of Stormwater Treatment BMPs Workshop, December 2011
    • Plant Materials • Pots – Fast to establish, “Instant gratification.” Most expensive. • Plugs – Less costly than potted material, but fairly quick to establish. • Seeding – Slowest to establish. Typically only used on large sites for cost savings. Concerns over wash-out, weeds, appearance first couple years. • Care, Handling, & Planting to be covered later in class Photos: David Dods, URSInstallation and Maintenance of Stormwater Treatment BMPs Workshop, December 2011
    • Planting Large Pots Remove, not distribute, excess soil dug for planting, or allow for it in grading (don’t want to fill in garden bed) Photo: David Dods, URSInstallation and Maintenance of Stormwater Treatment BMPs Workshop, December 2011
    • Mulch Photos: David Dods, URS • Coarse, Shredded Hardwood: Heavy, Binds together, Resists floating away • Don’t use finely ground • Pinebark nuggets and chipped mulch float • Don’t overfill mulch depthInstallation and Maintenance of Stormwater Treatment BMPs Workshop, December 2011
    • EdgingPhotos: David Dods, URS • Many Options: Steel, brick, stone, pavers, concrete • Ask designer if water is supposed to flow in or out over edging; Installation depth critical if water is to go over Installation and Maintenance of Stormwater Treatment BMPs Workshop, December 2011
    • Finishing TouchesPhoto: Carla Dods Photo: Rusty Schmidt • Borders, fence, walls, decorations often included • Take care to avoid compacting soil during installations Installation and Maintenance of Stormwater Treatment BMPs Workshop, December 2011
    • Control Water Level Until Plants are Established (and keep upstream erosion controls in place)Photo: Barr Engineering Photo: Rusty Schmidt Inlet temporarily blocked Outlet rim will be raised once plants are established Installation and Maintenance of Stormwater Treatment BMPs Workshop, December 2011
    • Thanks & Credits Thanks for sharing photos, illustrations, and advice: Todd Bond, Jessi Veach, Kevin Slates, URS, Overland Park, Kansas Rusty Schmidt and Dan Shaw, Waterdrop Innovations, River Falls, Wisconsin Carla Dods, Shockey Consulting, Lenexa, Kansas Kurt Leuthold and Fred Rozumalski, Barr Engineering, Minneapolis, Minnesota Matt Schoell-Schafer and Lisa Treese, Patti Banks Associates, Kansas City, Missouri Meg Babani, Taliaferro & Browne, Kansas City, Missouri Steve Roth, DRG Engineers, Bonner Springs, Kansas Lee Skabelund, Kansas State University, Manhattan, Kansas Jim Scheussler, BNIM Architects, Kansas City,MissouriInstallation and Maintenance of Stormwater Treatment BMPs Workshop, December 2011
    • Questions ?david.dods@urs.com, 913.344.1022