Low Impact Development Manual for Michigan - OSEH - University ...

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e. Add six inches compost or other media and till up to eight inches for minor compaction. (Six inches of compost equates to 18.5 cubic yards per 1,000 square feet of soil.) f. Add 10 inches compost or other amendment and till up to 20 inches for major compaction. 10 inches of compost equates to approx. 30.9 cubic yard per 1,000 square feet. g. Compost can be amended with bulking agents, such as aged crumb rubber from used tires, or wood chips. This can be a cost-effective alternative that reuses waste materials while increasing permeability of the soil. Stormwater Functions and Calculations Volume and peak rate reduction Restored soils result in increased infiltration, decreased volume of runoff, and significantly delayed runoff. Soil restoration will lower runoff volume and peak rates by lowering the runoff coefficient (i.e., curve number). Designers can receive credit based on areas (acres) complying with the requirements of these BMPs. These areas can be assigned a curve number (CN) reflecting a “good” condition instead of “fair” as required for other disturbed pervious areas. Chapter 9 and Worksheets 3 and 4 show how to calculate the runoff credit for this BMP. Water quality improvement Although either organic or inorganic materials may be used as soil media, only organic matter can improve water quality by increasing the nutrient holding capacity of soils. Soils rich in organic matter contain microorganisms that immobilize or degrade pollutants. See Chapter 9 for information on how to calculate the volume of runoff that needs treatment for water quality improvement. Organic materials that include fecal matter or animal renderings should not be used where water may infiltrate though the soil and carry nutrients, primarily phosphorus, to surface waters (Hunt and Lord, 2006). Maintenance Soil restoration may need to be repeated over time, due to compaction by use and/or settling. Taking soil core samples will help to determine the degree of soil compaction and if additional media application is necessary. Winter Considerations Since soil restoration is performed in conjunction with plantings, this BMP should be undertaken in spring or autumn and during dry weather, so that plantings can establish. Cost Cost information has been compiled by Cahill Associates and reflects 2007 conditions: • Tilling costs range from $800/acre to $1,000/acre • Compost costs range from $860/acre to $1,000/ acre. Costs of other soil media would vary greatly depending on their individual material costs and the amounts used. LID Manual for Michigan – Chapter 7 Page 286
Criteria to receive credits for Soil Restoration To receive credit for soil restoration under a location regulation, the following criteria must be met: Area is clearly shown on all construction drawings and delineated in the field. Tilling the soil is required if subsoil is compacted; needs to occur before amending media is applied. Area is not located on slopes greater than 30 percent. Area is not within the critical root zone of any tree. Amendment consists of six inches for minor compaction; 10 inches of amendment for major compaction. Area is located on the development project. Designer/Reviewer Checklist for Soil Restoration Type of soil amendment(s) proposed: ___________________________________________________________ Amount of amendments(s) to be used: __________________________________________________________ ITEM YES NO N/A NOTES Appropriate soil amendment(s) for the site conditions? Adequate amount of amendment materials? Bulk density/degree of compaction considered? Appropriate decompaction techniques and equipment? Appropriate construction sequencing? Sensitive areas (e.g., near existing trees, shallow utilities, and steep slopes) accounted for? Appropriate vegetation selected? Seasonality of planting/construction considered? Erosion and sedimentation control provided? Maintenance accounted for and plan provided? LID Manual for Michigan – Chapter 7 Page 287
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A Design Guide for Implementers and
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LID Manual for Michigan Page ii
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Shawn Keenan, City of Auburn Hills
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Appendix G: Stormwater Management P
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Figure 7.18 Filter with infiltratio
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Table 7.9 Definitions of Wetland Ve
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How this manual is organized This m
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discuss a new development. The staf
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In a natural woodland or meadow in
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Almost all components of the urban
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Benefits of implementing LID Implem
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Table 2.2 Summary of Cost Compariso
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Getting started with LID LID can be
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Precipitation also varies slightly
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Figure 3.4 Soil Freezing in Lower M
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Figure 3.6 Michigan Surficial Geolo
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Most soils in Michigan are classifi
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Table 3.3 Representative Cation Exc
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There is currently no single broadl
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Wellhead protection areas/ public w
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Table 3.4 Michigan Rivers and Strea
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References * Bailey, R.M and G.R. S
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LID Manual for Michigan - Chapter 3
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Following are sample goals and poli
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Develop regulations that encourage/
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Construction activity • Minimize
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Street sweeping in Bloomfield Towns
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Resistance from internal sources an
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Site constraints that may pose chal
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Entity Stormwater Jurisdiction Coun
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Step 1: Property acquisition and us
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can be incorporated into the develo
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Step 3: Integrate municipal, county
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BMP Selection Process This chapter
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Case Study: Title The second page o
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Case Study: Pokagon Band of Potawat
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Figure 6.2 Conventional development
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Designer/Reviewer Checklist for Clu
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Case Study: Minimizing soil compact
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4. Topsoil stockpiling and storage
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References Hanks, D. and Lewandowsk
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Case Study: Longmeadow Development
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Applications Minimizing the total d
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Criteria to Receive Credits for Min
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Case Study: Marywood Health Center
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Design Considerations 1. Identify n
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References Center for Watershed Pro
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Case Study: Macomb County Public Wo
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Zone 3: Also termed the “outer zo
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• Limit clearing and grading of f
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Case Study: Western Michigan Univer
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Protection of sensitive areas in re
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then weightings of potential develo
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Floodplains • Design the project
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References Arendt, Randall G. Growi
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Case Study: Willard Beach Implement
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Table 6.2 Narrow residential street
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Parking Parking lots often comprise
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Designer/Reviewer Checklist for Red
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Case Study: Saugatuck Center for th
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In addition to directing runoff to
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Designer/Reviewer Checklist for Dis
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Runoff Volume/ Infiltration Runoff
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Figure 7.1 Structural BMP Selection
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In general, the techniques describe
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Table 7.3 Additional BMP considerat
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Maintenance Provides guidance on re
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Case Study: Grayling Stormwater Pro
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Figure 7.5 illustrates a schematic
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Flow inlet: Curbs and curb cuts Cur
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Roads and highways Figure 7.13 show
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Design Considerations Bioretention
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7. Planting periods will vary but,
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Construction Guidelines The followi
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Designer/Reviewer Checklist for Rai
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Case Study: Stormwater Capture with
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Ford Rouge Plant cistern Vertical s
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Design Considerations Design and in
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the tank can accommodate.) (www.sta
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References “Black Vertical Storag
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Case Study: Constructed Linear Sand
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Surface non-vegetated filter A surf
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Large subsurface filter Large Subsu
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would modestly increase constructio
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During inspection the following con
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References Atlanta Regional Commiss
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Site Factors Type Basin Bottom Rela
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Variations For this manual, detenti
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Precast concrete vault Source: Amer
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surface into the pond to a maximum
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sink for pollutants and generally h
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The presettlement and post-developm
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wet pond and constructed wetland op
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ackfilling operation should driven
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Designer/Reviewer Checklist for Dry
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Designer/Reviewer Checklist for Con
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References AMEC Earth and Environme
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Key Design Features • Depth to wa
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Case Study: Saugatuck Center for th
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Infiltration basins, subsurface inf
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Figure 7.24 Cross-section of dry we
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• The soil mantle should be prese
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Additional design considerations fo
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• Though roofs are generally not
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Subsurface infiltration bed Source:
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Stormwater Functions and Calculatio
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• Protect the infiltration area f
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Additional Construction Guidelines
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Designer/Reviewer Checklist for Inf
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References AMEC Earth and Environme
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Case Study: Washtenaw County West S
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Design Considerations Level spreade
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3. Inspect the filter strip and the
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References Hathaway, Jon and Hunt,
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Case Study: Black River Heritage Tr
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Figure 7.31 Native meadow species c
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Applications • Residential - Nati
Page 248 and 249: 5. Amend soil: In those sites where
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Page 252 and 253: References Arendt, R. Growing Green
Page 254 and 255: Case Study: Grand Valley State Univ
Page 256 and 257: Staging, construction practices, an
Page 258 and 259: Reinforced turf/gravel Reinforced t
Page 260 and 261: 4. Pervious pavement and infiltrati
Page 262 and 263: 12. Proper pervious pavement applic
Page 264 and 265: Figure 7.40 Open-graded, clean, coa
Page 266 and 267: Repairs • Surface should never be
Page 268 and 269: References Adams, Michele. “Porou
Page 270 and 271: Case Study: Michigan Avenue Streets
Page 272 and 273: Native vegetation should be used in
Page 274 and 275: Design Considerations • Suggested
Page 276 and 277: oxes, etc. should be installed in a
Page 278 and 279: References Stormwater Management Gu
Page 280 and 281: Case Study: Nankin Mills Interpreti
Page 282 and 283: Figure 7.45 Schematic of a three-zo
Page 284 and 285: 3. Analyze site’s vegetative feat
Page 286 and 287: Black River Heritage Trail and Wate
Page 288 and 289: Table 7.14 Tree spacing per acre Sp
Page 290 and 291: 4. Stable debris As Zone 1 reaches
Page 292 and 293: References Alliance for the Chesape
Page 294 and 295: Case Study: Ann Arbor District Libr
Page 296 and 297: • Major compaction - Deep compact
Page 300 and 301: References “Achieving the Post-Co
Page 302 and 303: Case Study: Wayne County, MI Ford R
Page 304 and 305: slope needs to be determined. This
Page 306 and 307: Figure 7.52 Sandy soils with HSG Gr
Page 308 and 309: Figure 7.56 Clay Loam, Silty Clay o
Page 310 and 311: • Guidance information, usually i
Page 312 and 313: LID Manual for Michigan - Chapter 7
Page 314 and 315: Case Study: City of Battle Creek Ci
Page 316 and 317: Table 7.16 Vegetated roof types Ext
Page 318 and 319: Dual media assemblies Dual media (F
Page 320 and 321: Over a period of time roots can dam
Page 322 and 323: Technical requirements Root resista
Page 324 and 325: Stormwater Functions and Calculatio
Page 326 and 327: Designer/Reviewer Checklist for Veg
Page 328 and 329: Case Study: Meadowlake Farms Bioswa
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Page 332 and 333: Stone check dams Source: Road Commi
Page 334 and 335: Table 7.18 Permanent stabilization
Page 336 and 337: Peak rate mitigation Vegetated swal
Page 338 and 339: Designer/Reviewer Checklist for Veg
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Page 342 and 343: Case Study: LaVista Storm Drain Pro
Page 344 and 345: Basket type inserts Basket type ins
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Roadway design, construction, and m
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• Vegetated systems such as grass
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Of the options explored, the study
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Figure 8.3 Tree planting detail Sou
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Opportunities for MPOs Metropolitan
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Construction on the project began i
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The following are examples of imple
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Horizontal grates can be added to a
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East Hills Center City of Grand Rap
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Implementing LID in High Risk Areas
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References AASHTO Center for Enviro
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LID Design Criteria Defining the hy
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Flood control Flood control is base
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Table 9.1 90 Percent Nonexceedance
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Initial abstraction (I a ) includes
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The Curve Number Method is less acc
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I = the average rainfall intensity
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Table 9.4 Rainfall Events of 24-Hou
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• Proceed to Flow Chart B, Peak R
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FLOW CHART A Stormwater Calculation
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Excessively drained soils may requi
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Worksheet 2. Sensitive Natural Reso
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WORKSHEET 4. Calculations for Volum
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WORKSHEET 6. SMALL SITE / SMALL IMP
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WORKSHEET 8. WATER QUALITY WORKSHEE
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Reese, S. and J. Lee. “Summary of
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ing Department. Most maintenance co
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The Hydrotech Garden Roof Assembly
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Bioswales provide infiltration of s
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The Ingham County Drain Commissione
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Constructed wetland The lowest port
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LID Manual for Michigan - Appendix
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Check dam Cistern Clustering Combin
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H:V Horizontal to vertical ratio. H
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Planter box Pervious pavement Phase
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Total phosphorous (TP) The total am
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Ecoregion recommendations are also
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Zone A Planting Zone = two-to-four
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Zone C Planting Zone = zero-to-two
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Representative Zone C Species Cardi
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Botanical Name Common Name Height C
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Zone E Planting Zone = four-to-18 i
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Representative Zone E Species Tall
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Botanical Name Common Name Height C
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Zone G Planter Box Plantings Althou
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Zone H Vegetated Roof Plantings Res
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Pervious Berms (Vegetated Filter St
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Vegetated roofs Some key components
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Step 1. Background evaluation Prior
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Methodology for double-ring infiltr
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Step 4. Use design considerations p
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Detention BMP Inspection Checklist*
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Infiltration BMPs Inspection Checkl
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Bioretention Inspection Checklist*
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Bioswale, Filter Strip Inspection C
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6. The [Community] or its designee
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STATE OF MICHIGAN ) ) ss. COUNTY OF
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Exhibit B - Location Map (Sample) S
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• Stormwater runoff, soil erosion
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Retention. A holding system for sto
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ARTICLE IV. STORMWATER PLAN REQUIRE
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The particular facilities and measu
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10. Rainfall Frequency Atlas of the
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Table H.2 Pre-Treatment Options for
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f. Complete development agreements
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must be submitted to the Michigan D
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C. Construction Plans shall be revi
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fine for each day. The rights and r
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Southeast Michigan Council of Gover
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