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

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LID Manual for Michigan – Appendix H Page 476
Model LID Stormwater Ordinance This model ordinance is based on a draft ordinance developed by Environmental Consulting and Technology, Inc., a model ordinance developed by Cahill and Associates, and a model ordinance developed by the Kent County Drain Commissioner Stormwater Management Task Force. Reviewed by: JFNew Carlisle Wortman Associates Macomb County Planning and Economic Development This model ordinance is general guidance to assist local communities interested in implementing a stormwater ordinance. This ordinance is NOT legal advice. Details of both substance and process in an ordinance will vary from community to community based on local conditions and institutional structures. A first step in preparing a stormwater ordinance is to engage local stakeholders including elected officials, engineers, and planners. Proposed ordinances should not be finalized without advice and involvement of legal counsel. AN ORDINANCE to provide for the regulation and control of stormwater runoff, which results in protecting waterways and sensitive areas in the community. This ordinance is intended to protect sensitive areas and local waterways, but at the same time allowing the designer the flexibility in protecting these resources. ARTICLE I. TITLE, FINDINGS, PURPOSE Section 1.01 Title This ordinance shall be known as the “ Stormwater Management Ordinance” and may be so cited. Section 1.02 Findings finds that: • Water bodies, roadways, structures, and other property within, and downstream of are at times subjected to flooding. • Land development alters the hydrologic response of watersheds, resulting in increased stormwater runoff rates and volumes, increased flooding, increased stream channel erosion, increased sediment transport and deposition, and increased nonpoint source pollutant loading to the receiving water bodies and the Great Lakes. • Stormwater runoff produced by land development contributes to increased quantities of water-borne pollutants. • Increases of stormwater runoff, soil erosion, and nonpoint source pollution have occurred as a result of land development, and have impacted the water resources of the Watershed. • Increased stormwater runoff rates and volumes, and the sediments and pollutants associated with stormwater runoff from future development projects within will, absent proper regulation and control, adversely affect water bodies and water resources, and those of downstream municipalities. LID Manual for Michigan – Appendix H Page 477
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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
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Basket type inserts Basket type ins
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Maintenance is crucial to the effec
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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
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
Page 444 and 445: Pervious Berms (Vegetated Filter St
Page 446 and 447: Vegetated roofs Some key components
Page 450 and 451: Step 1. Background evaluation Prior
Page 452 and 453: Methodology for double-ring infiltr
Page 454 and 455: Step 4. Use design considerations p
Page 458 and 459: Detention BMP Inspection Checklist*
Page 460 and 461: Infiltration BMPs Inspection Checkl
Page 462 and 463: Bioretention Inspection Checklist*
Page 464 and 465: Bioswale, Filter Strip Inspection C
Page 468 and 469: 6. The [Community] or its designee
Page 470 and 471: STATE OF MICHIGAN ) ) ss. COUNTY OF
Page 472 and 473: Exhibit B - Location Map (Sample) S
Page 490 and 491: • Stormwater runoff, soil erosion
Page 492 and 493: Retention. A holding system for sto
Page 494 and 495: ARTICLE IV. STORMWATER PLAN REQUIRE
Page 496 and 497: The particular facilities and measu
Page 498 and 499: 10. Rainfall Frequency Atlas of the
Page 500 and 501: Table H.2 Pre-Treatment Options for
Page 502 and 503: f. Complete development agreements
Page 504 and 505: must be submitted to the Michigan D
Page 506 and 507: C. Construction Plans shall be revi
Page 508 and 509: fine for each day. The rights and r
Page 512: Southeast Michigan Council of Gover
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