Stormwater Management Standards Manual - Toledo Metropolitan ...

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Design Guidelines Site Preparation A subsoiler, plow or other implement shall be used to reduce soil compaction and allow maximum infiltration. Subsoiling shall not be done on slip-prone areas where soil preparation should be limited to what is necessary for establishing vegetation. Sod Installation Sod shall be harvested, delivered and installed within a period of 48 hrs. Sod not transplanted within this period shall be inspected and approved prior to installation. The sod shall be kept moist and covered during hauling and preparation. During dry periods with excessively high temperatures, the soil shall be lightly irrigated immediately prior to laying the sod. Sod shall not be placed on frozen soil. On sloping areas where erosion may be a problem the sod shall be secured with staples or pegs. The sod shall be laid with the long edge parallel to the contour and with staggered joints. The first row of sod shall be laid in a straight line, with subsequent rows placed parallel and tightly wedged against each other. As sodding is completed in any one section, the entire area shall be rolled or tamped to ensure solid contact of roots with the soil surface. Sod shall be watered immediately after rolling or tamping until the sod and soil surface below are thoroughly wet. Sod Maintenance In the absence of adequate rainfall during the first week, watering shall be performed daily or as often as necessary and in sufficient quantities to maintain moist soil to a depth of 4 in. 8. Sediment Traps Description Sediment traps are one of the most commonly used and cost-effective measures for treating sedimentladen runoff. Sediment traps are usually placed near the edge of construction sites, out of the way of most construction activity. They have sediment-trapping efficiencies of 50-80% and require minimal maintenance compared to other practices. Applicability Sediment traps are used where the total contributing drainage area is less than 10 acres. Larger sites shall utilize a sediment basin, with designed control volumes. Design Guidelines Sediment Trap Size The volume of the sediment trap shall be at least 67 cubic yards per acre of contributing drainage area. The volume shall be measured from below the crest elevation of the outlet. The total volume may be achieved by a combination of excavation and/or a compacted embankment. Sediment Trap Shape The sediment trap design shall incorporate the following features to improve trapping efficiency: Length-to-width ratio greater than 2:1, where length is the distance between the inlet and the outlet, A wedge shape with the inlet located at the narrow end, Shallow depth and maximum surface area. Third Edition Stormwater Standards Manual September 2008 Page 162
Embankments 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. Embankments shall not exceed 5 ft. in height. The embankment shall be at least 1.5 feet above the outlet crest. The top width of embankments must be at least 4 ft. wide with side slopes of 2:1 or flatter. The embankment shall be compacted during its construction. Excavation Excavated side slopes shall not exceed 2:1 unless a safety fence is constructed around the trap area. Outlet Geotextile shall be placed over the bottom and slopes of the outlet spillway. Geotextile shall continue downstream of the embankment to form an apron on the surrounding ground. To prevent from flowing under the Geotextile, the sections placed nearest the front shall overlap the following sections by at least 2 ft. Rock used in the outlet spillway shall be placed 1 ft. thick on the geotextile. The rock shall be between Type C and Type D rock where D 50 is about 8 in. Maintenance Sediment clean out shall prevent sediment from occupying more than 40% of the trap’s volume. When sediment is removed, the sediment trap shall be restored to its original dimensions. Removed sediment shall be deposited in a suitable area and stabilized so that it will not erode. Third Edition Stormwater Standards Manual September 2008 Page 163
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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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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,
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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 164 and 165: Example of a Sediment Trap Figure A
Page 166 and 167: Safety Sediment basins shall be con
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 210 and 211: Conservation Development for Munici
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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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