Stormwater Management Standards Manual - Toledo Metropolitan ...

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Plan View Of A Bioretention Cell Figure 5- 6 Plan View of a Bioretention Cell Source: Prince George’s County, 1993 Section View Of A Bioretention Cell Figure 5- 12 Section View of a Bioretention Cell Source: Prince George’s County, 1993 Third Edition Stormwater Standards Manual September 2008 Page 80
Soil Matrix Engineered soils are necessary for the majority of bioretention cells. The soil matrix should be designed to achieve the desired infiltration rates, removal of the target pollutant(s), and support the desired plant material. The following soil mix is recommended by Hunt (2005): Bioretention Soil Mix 85-88% sand: A washed medium sand is sufficient. 8-12% fines: Fines include both clay and silt. 3-5% organic matter: Newspaper and peat moss are often used. Figure 5- 7 Bioretention Soil Mix The planned soil media must be thoroughly mixed and consistent. In addition, soils must be adjusted to treat the target pollutants of the site. When target pollutants are not taken into consideration, the bioretention area will not improve water quality. How Target Pollutants Influence Media Depth and Infiltration Rate Pollutant Media Depth Infiltration Rate Comments TSS No minimum fill depth required 2-6 inches per hour recommended If high TSS influent, frequent maintenance is required. Pathogens No minimum fill depth required 2-6 inches per hour recommended Limiting plant coverage allows more direct sunlight to kill pathogens. Metals 18 inches 2-6 inches per hour recommended Must keep top layer of cell from saturating for extended periods of time. Temperature TBD. Conservatively, at least 36 inches. TBD, slower rates may be preferable (less than 2 inches per hour) Introduction of IWS volume at the bottom of the cell may reduce effluent temperature. Total Nitrogen Minimum 30 inches, 36 inches preferred 1-2 inches per hour, slower is better Introduction of IWS volume may reduce TN concentrations. Total Phosphorus 24 inches 2 inches per hour A low P-index is essential. Recommended P- Index should range from 15 to 30. Figure 5- 8 How Target Pollutants Influence Media Depth and Infiltration Rate Table taken from Bioretention Performance and Design, Construction and Maintenance Considerations for Bioretention (Hunt, 2005) Third Edition Stormwater Standards Manual September 2008 Page 81
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TMACOG STORMWATER MANAGEMENT STANDA
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3.5.3 Drainage Structure Location .
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8.2.2 Regulatory Floodway..........
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GROUND WATER TABLE ................
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TN ................................
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Flow Around Ends ..................
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FIGURES Figure 1-1 Effects of Urban
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Executive Summary The Stormwater Co
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Chapter 8: Regulatory Floodplain an
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has taken 30 years to start to iden
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1.3.1 Changes in Watershed Hydrolog
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A well-designed plan requires consi
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1.5.1 Nonstructural Controls Nonstr
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CHAPTER 2 - Stormwater Management S
Page 30 and 31: applications. These regulations are
Page 32 and 33: • Description of how the Runoff R
Page 34 and 35: Lucas County Lucas County Engineer
Page 36 and 37: Township of Richfield 3951 Washburn
Page 38 and 39: CHAPTER 3 - RUNOFF REDUCTION HIERAR
Page 40 and 41: keeping stormwater pollution out of
Page 42 and 43: Schueler, T. R., Site Planning for
Page 44 and 45: Rainfall Intensities in Inches/Hour
Page 46 and 47: f. HEC-RAS used for FEMA Studies 3.
Page 48 and 49: 3.5.2 Capacity Storm sewers should
Page 50 and 51: a. All materials should be of such
Page 52 and 53: 4.1.1 Exclusions: Activities that a
Page 54 and 55: • Total area of the site and the
Page 56 and 57: stabilization, vegetative buffer st
Page 58 and 59: The sediment settling pond volume c
Page 60 and 61: for roads or utilities), the projec
Page 62 and 63: SWP3 is adequate, or whether additi
Page 64 and 65: work best in gently sloping areas (
Page 66 and 67: function by slowing runoff velociti
Page 68 and 69: Sand filtration systems are most be
Page 70 and 71: limited to a height of 18 inches. T
Page 72 and 73: Example of a Perimeter Sand Filter
Page 74 and 75: 5.3 Runoff Treatment 5.3.1 Bioreten
Page 76 and 77: Site Applicability Bioretention is
Page 78 and 79: Introducing Runoff Runoff must be i
Page 82 and 83: Underdrain Gravel Underdrain gravel
Page 84 and 85: Type Botanical Name Common Name F T
Page 86 and 87: • The cell is draining properly a
Page 88 and 89: General Applicability Land Area Con
Page 90 and 91: energy of the inflow. Stone riprap
Page 92 and 93: Maintenance Maintenance Agreement A
Page 94 and 95: 5.3.3 Wet Detention Ponds Wet deten
Page 96 and 97: Minimal Water Supply To avoid drawd
Page 98 and 99: Sediment Removal Sediment removal i
Page 100 and 101: 5.3.4 Dry Extended Detention Basins
Page 102 and 103: Riser Design Hoods or trash racks s
Page 104 and 105: Example of a Dry Extended Detention
Page 106 and 107: CHAPTER 6 - ILLICIT DISCHAGE DETECT
Page 108 and 109: Should be the same agency as tracin
Page 110 and 111: Sewer Conversion: Areas that were o
Page 112 and 113: 6.4.2 Dry Weather Field Screening T
Page 114 and 115: 6.5.1 Local Agency Contact Informat
Page 116 and 117: CHAPTER 7 - Riparian Setbacks _____
Page 118 and 119: Floodplains perform crucial roles,
Page 120 and 121: are ecologically compatible and emp
Page 122 and 123: yards, recycling facilities, quarri
Page 124 and 125: 8.2 Lands Subject to These Control
Page 126 and 127: more than 1.0 foot. (Some jurisdict
Page 128 and 129: • Be consistent with the need to
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• Category 1 - wetlands are consi
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eissued (extended), and revoked fro
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Oak Openings Region Boundary Figure
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Authorized representatives of local
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Base Flood The flood having one per
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1. Dry Detention Basin A basin that
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Fill Added earth that is designed t
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Infiltration The absorption of wate
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Ohio Rapid Assessment Method A mult
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Regulatory Floodway The channel and
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Soil and Water Conservation Distric
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Temporary Soil Erosion and Sediment
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Appendix B: Best Management Practic
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Example of Matting Installation Fig
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Description Applying a protective l
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6. Permanent Seeding Description Pe
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Design Guidelines Site Preparation
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Example of a Sediment Trap Figure A
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Safety Sediment basins shall be con
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Example of a Sediment Basin Figure
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Example of Silt Fence Installation
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Examples of Inlet Protection Techni
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Example of Construction Entrance Fi
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Maintenance Mud spilled, dropped, w
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Figure Appendix B- 9 Example of Str
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summary of the activities the juris
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Riparian Resolution for Township RI
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Riparian Resolution for Township SE
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Riparian Resolution for Township 26
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Riparian Resolution for Township 1.
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Riparian Resolution for Township ap
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Riparian Resolution for Municipalit
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Conservation Development for Townsh
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Conservation Development for Munici
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Lucas County Stormwater Quality Rul
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Sediment and Erosion Control Ordina
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Illicit Discharge & Illegal Connect
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