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

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WORKSHEET 6. SMALL SITE / SMALL IMPERVIOUS AREA EXEMPTION FOR PEAK RATE MITIGATION CALCULATIONS NOTE: This does not exempt small projects from stormwater management, only the peak rate mitigation calculations. The following conditions must be met for exemption from peak rate analysis for small sites: !"#$%&'#()*$%+&",-)$.-/,00$1,2-3#$4/5)#(6#$3-67$8#$5,/7),22#9$4/$:;47"$3(/-(2$=-49(/5#? !,7(2$@),A#57$43@#)B4,-6$()#($3(C$/,7$#D5##9$1 acre. ;(D43-3$@),@,6#9$9467-)8#9$()#($46$10 acres? ;(D43-3$@),@,6#9$43@#)B4,-6$5,B#)$46$EFG?
PROJECT: Subwatershed: Storm Event WORKSHEET 7. PEAK RATE MITIGATION SUMMARY SHEET 1-year 24 2-year 24 5-year 24 10-year 24 25-year 24 50-year 24 100-year 24 1 - As determined by computer simulation, acceptable calculation methods, etc. 2 - If applicable to the peak rate criteria. Notes, Special Conditions, etc.: Applicable Peak Rate Criteria (e.g. pre- vs. post, release rate): Storm Duration (hr) Additional Flood Control Criteria (if applicable): Are criteria applicable to this storm? (Yes / No) Post- Settlement Peak Discharge Rate 1 (cfs) Pre-Settlement Peak Discharge Rate 1,2 (cfs) Other peak rate criteria, if applicable (cfs) Are the criteria met? (Yes / No) LID Manual for Michigan – Chapter 9 Page 383
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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
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5. Amend soil: In those sites where
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Water quality improvement Landscape
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References Arendt, R. Growing Green
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Case Study: Grand Valley State Univ
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Staging, construction practices, an
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Reinforced turf/gravel Reinforced t
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4. Pervious pavement and infiltrati
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12. Proper pervious pavement applic
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Figure 7.40 Open-graded, clean, coa
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Repairs • Surface should never be
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References Adams, Michele. “Porou
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Case Study: Michigan Avenue Streets
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Native vegetation should be used in
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Design Considerations • Suggested
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oxes, etc. should be installed in a
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References Stormwater Management Gu
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Case Study: Nankin Mills Interpreti
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Figure 7.45 Schematic of a three-zo
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3. Analyze site’s vegetative feat
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Black River Heritage Trail and Wate
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Table 7.14 Tree spacing per acre Sp
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4. Stable debris As Zone 1 reaches
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References Alliance for the Chesape
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Case Study: Ann Arbor District Libr
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• Major compaction - Deep compact
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e. Add six inches compost or other
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References “Achieving the Post-Co
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Case Study: Wayne County, MI Ford R
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slope needs to be determined. This
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Figure 7.52 Sandy soils with HSG Gr
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Figure 7.56 Clay Loam, Silty Clay o
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• Guidance information, usually i
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Case Study: City of Battle Creek Ci
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Table 7.16 Vegetated roof types Ext
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Dual media assemblies Dual media (F
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Over a period of time roots can dam
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Technical requirements Root resista
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Stormwater Functions and Calculatio
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Designer/Reviewer Checklist for Veg
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Case Study: Meadowlake Farms Bioswa
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lower flows (two-year storm) to dra
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Stone check dams Source: Road Commi
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Table 7.18 Permanent stabilization
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Peak rate mitigation Vegetated swal
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Designer/Reviewer Checklist for Veg
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Case Study: LaVista Storm Drain Pro
Page 344 and 345: Basket type inserts Basket type ins
Page 346 and 347: Maintenance is crucial to the effec
Page 348 and 349: Roadway design, construction, and m
Page 350 and 351: • Vegetated systems such as grass
Page 352 and 353: Of the options explored, the study
Page 354 and 355: Figure 8.3 Tree planting detail Sou
Page 356 and 357: Opportunities for MPOs Metropolitan
Page 358 and 359: Construction on the project began i
Page 360 and 361: The following are examples of imple
Page 362 and 363: Horizontal grates can be added to a
Page 364 and 365: East Hills Center City of Grand Rap
Page 366 and 367: Implementing LID in High Risk Areas
Page 368 and 369: References AASHTO Center for Enviro
Page 370 and 371: LID Design Criteria Defining the hy
Page 372 and 373: Flood control Flood control is base
Page 374 and 375: Table 9.1 90 Percent Nonexceedance
Page 376 and 377: Initial abstraction (I a ) includes
Page 378 and 379: The Curve Number Method is less acc
Page 380 and 381: I = the average rainfall intensity
Page 382 and 383: Table 9.4 Rainfall Events of 24-Hou
Page 384 and 385: • Proceed to Flow Chart B, Peak R
Page 386 and 387: FLOW CHART A Stormwater Calculation
Page 388 and 389: Excessively drained soils may requi
Page 390 and 391: Worksheet 2. Sensitive Natural Reso
Page 392 and 393: WORKSHEET 4. Calculations for Volum
Page 396 and 397: WORKSHEET 8. WATER QUALITY WORKSHEE
Page 398 and 399: Reese, S. and J. Lee. “Summary of
Page 400 and 401: ing Department. Most maintenance co
Page 402 and 403: The Hydrotech Garden Roof Assembly
Page 404 and 405: Bioswales provide infiltration of s
Page 406 and 407: The Ingham County Drain Commissione
Page 408 and 409: Constructed wetland The lowest port
Page 410 and 411: LID Manual for Michigan - Chapter 1
Page 412 and 413: LID Manual for Michigan - Appendix
Page 414 and 415: Check dam Cistern Clustering Combin
Page 416 and 417: H:V Horizontal to vertical ratio. H
Page 418 and 419: Planter box Pervious pavement Phase
Page 420 and 421: Total phosphorous (TP) The total am
Page 422 and 423: Ecoregion recommendations are also
Page 424 and 425: Zone A Planting Zone = two-to-four
Page 426 and 427: Zone C Planting Zone = zero-to-two
Page 428 and 429: Representative Zone C Species Cardi
Page 430 and 431: Botanical Name Common Name Height C
Page 432 and 433: Zone E Planting Zone = four-to-18 i
Page 434 and 435: Representative Zone E Species Tall
Page 436 and 437: Botanical Name Common Name Height C
Page 438 and 439: Zone G Planter Box Plantings Althou
Page 440 and 441: Zone H Vegetated Roof Plantings Res
Page 442 and 443: LID Manual for Michigan - Appendix
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Pervious Berms (Vegetated Filter St
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Vegetated roofs Some key components
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LID Manual for Michigan - Appendix
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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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