Stormwater Management Standards Manual - Toledo Metropolitan ...

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Safety Sediment basins shall be constructed with side slopes of 2:1 or flatter. Basins will be surrounded with safety fence and posted with warning signs where appropriate. Embankment Embankments should have side slopes of 2:1 or flatter. The area under the embankment shall be cleared, grubbed, and stripped of any vegetation and root mat. Fill material used for the embankment shall be free of roots or other woody vegetation as well as oversized rocks, stones and organic materials. Construction equipment shall be operated over each layer in a manner that will result in the required degree of compaction. The embankment dimensions will meet the following requirements: Embankment Dimensions Embankment Height (ft.) Minimum Top Width (ft.) 20 12 Table Appendix B- 3 Embankment Dimensions Principal Spillway Capacity: The principal spillway must pass at least 1 cfs / ac. of drainage area when the water surface is at the crest of the emergency spillway. The principal spillway will generally pass less than the one-year frequency storm. Crest Elevation: Elevation of the riser pipe must be a minimum of 1 ft. below the elevation of the emergency spillway. Dewatering: Dewatering capability should be a part of the sediment basin design. Cleanout of relatively dry materials can be handled with on-site equipment rather than expensive draglines, often needed to handle wet materials. Riser Base: The principal spillway shall be weighted with concrete to prevent flotation. The minimum safety factor against floatation shall be 1.1. Trash Rack: To prevent the riser from becoming clogged with construction debris, a trash rack should be used. Anti-seep Collars: Anti-seep collars shall be used on the barrel of the principal spillway to prevent seepage and erosion of the embankment. Anti-seep collars may not be needed if the embankment is less than 10 ft. and the barrel is 12 in. or smaller if made from corrugated metal pipe or 8 in. or smaller if made from smooth walled conduit. Outlet protection: The outlet must be armored with rock or other stable material and not cause erosion. Emergency Spillway Capacity: The emergency spillway shall have the capacity to pass at least 4 cfs / ac. of drainage area with a minimum freeboard of 1 ft. before overflowing the embankment. Third Edition Stormwater Standards Manual September 2008 Page 166
Location: The emergency spillway shall be cut in undisturbed ground. Accurate construction of the spillway elevation is critical and shall be within a tolerance of 0.2 ft. Maintenance Sediment shall be removed and the sediment basin restored to its original dimensions before the sediment has filled one-half the pond’s original depth or as indicated on the plans. Sediment removed from the basin shall be placed and stabilized so that it will not erode. Third Edition Stormwater Standards Manual September 2008 Page 167
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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
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applications. These regulations are
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• Description of how the Runoff R
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Lucas County Lucas County Engineer
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Township of Richfield 3951 Washburn
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CHAPTER 3 - RUNOFF REDUCTION HIERAR
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keeping stormwater pollution out of
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Schueler, T. R., Site Planning for
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Rainfall Intensities in Inches/Hour
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f. HEC-RAS used for FEMA Studies 3.
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3.5.2 Capacity Storm sewers should
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a. All materials should be of such
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4.1.1 Exclusions: Activities that a
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• Total area of the site and the
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stabilization, vegetative buffer st
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The sediment settling pond volume c
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for roads or utilities), the projec
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SWP3 is adequate, or whether additi
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work best in gently sloping areas (
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function by slowing runoff velociti
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Sand filtration systems are most be
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limited to a height of 18 inches. T
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Example of a Perimeter Sand Filter
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5.3 Runoff Treatment 5.3.1 Bioreten
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Site Applicability Bioretention is
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Introducing Runoff Runoff must be i
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Plan View Of A Bioretention Cell Fi
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Underdrain Gravel Underdrain gravel
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Type Botanical Name Common Name F T
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• The cell is draining properly a
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General Applicability Land Area Con
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energy of the inflow. Stone riprap
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Maintenance Maintenance Agreement A
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5.3.3 Wet Detention Ponds Wet deten
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Minimal Water Supply To avoid drawd
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Sediment Removal Sediment removal i
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5.3.4 Dry Extended Detention Basins
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Riser Design Hoods or trash racks s
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Example of a Dry Extended Detention
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CHAPTER 6 - ILLICIT DISCHAGE DETECT
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Should be the same agency as tracin
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Sewer Conversion: Areas that were o
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6.4.2 Dry Weather Field Screening T
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6.5.1 Local Agency Contact Informat
Page 116 and 117: CHAPTER 7 - Riparian Setbacks _____
Page 118 and 119: Floodplains perform crucial roles,
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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
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Page 134 and 135: Oak Openings Region Boundary Figure
Page 136 and 137: Authorized representatives of local
Page 138 and 139: Base Flood The flood having one per
Page 140 and 141: 1. Dry Detention Basin A basin that
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Page 144 and 145: Infiltration The absorption of wate
Page 146 and 147: Ohio Rapid Assessment Method A mult
Page 148 and 149: Regulatory Floodway The channel and
Page 150 and 151: Soil and Water Conservation Distric
Page 152 and 153: Temporary Soil Erosion and Sediment
Page 154 and 155: Appendix B: Best Management Practic
Page 156 and 157: Example of Matting Installation Fig
Page 158 and 159: Description Applying a protective l
Page 160 and 161: 6. Permanent Seeding Description Pe
Page 162 and 163: Design Guidelines Site Preparation
Page 164 and 165: Example of a Sediment Trap Figure A
Page 168 and 169: Example of a Sediment Basin Figure
Page 170 and 171: Example of Silt Fence Installation
Page 172 and 173: Examples of Inlet Protection Techni
Page 174 and 175: Example of Construction Entrance Fi
Page 176 and 177: Maintenance Mud spilled, dropped, w
Page 178 and 179: Figure Appendix B- 9 Example of Str
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Page 182 and 183: Riparian Resolution for Township RI
Page 184 and 185: Riparian Resolution for Township SE
Page 186 and 187: Riparian Resolution for Township 26
Page 188 and 189: Riparian Resolution for Township 1.
Page 190 and 191: Riparian Resolution for Township ap
Page 192 and 193: Riparian Resolution for Municipalit
Page 202 and 203: Conservation Development for Townsh
Page 208 and 209: Conservation Development for Munici
Page 214 and 215: 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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