Stormwater Management Standards Manual - Toledo Metropolitan ...

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work best in gently sloping areas (5 percent maximum) where the swale is cut into the existing landscape. See figure 5-1. Design Guidelines Route & Length – Open vegetated swales should follow pre-development drainage patterns. Swale length should be a minimum of 200 feet when possible, to increase the contact time of stormwater. Longitudinal Slope – The maximum allowable longitudinal slope should be 5 percent. The slope should provide for sufficient drainage and uniform flow, while preventing excessive velocities. For slopes greater than 2 percent, a series of check dams or drop structures across swales should be used to maintain acceptable flows. Channel Shape – Swales should be designed to promote shallow, low velocity flow (i.e. trapezoidal channel). This maximizes the channel filtering surface, facilitates sedimentation and infiltration, and increases the travel time to the discharge point. The side slopes should be gentle enough to maximize the filtering surface and resist bank erosion, and steep enough to adequately contain anticipated flows. The side slopes of the channel should not be steeper than 2 Horizontal : 1 Vertical. Capacity – The swale should be designed to adequately convey the 10-year, 24-hour storm event at non-erosive velocities. Flow Velocity – The bottom of the channel should be wide enough to maintain the desired shallow flow, but narrow enough to maintain sufficient velocity to prevent rills from forming during low flows. The velocity for a 2-year, 24-hour storm should not exceed 2 feet per second. A series of check dams or drop structures across swales should be provided where necessary to enhance water quality performance and reduce velocities. Channel Stabilization – Slopes and bottoms of swales should be stabilized to prevent erosion. This is commonly accomplished with an erosion-resistant grass, such as tall fescue. If the grass is planted from seed, temporary matting is required to stabilize the soil while the grass is established. For swales in areas with steeper slopes, check dams may need to be constructed within the channel to slow the velocity. Third Edition Stormwater Standards Manual September 2008 Page 64
Example of a Grass Swale Application Figure 5- 1 Example of a Grass Swale Application Source: State of Maryland, Department of the Environment. 2000 Maryland Stormwater Design Manual, Vol. I & II. 5.2 Runoff Pre-Treatment 5.2.1 Filter Strips Filter strips (a.k.a., buffer strips, vegetated filter strips, grass filter strips, and grassed filters) are vegetated areas that are intended to treat sheet flow from adjacent impervious areas. Filter strips Third Edition Stormwater Standards Manual September 2008 Page 65
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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 ..................
Page 14 and 15: FIGURES Figure 1-1 Effects of Urban
Page 16 and 17: Executive Summary The Stormwater Co
Page 18 and 19: Chapter 8: Regulatory Floodplain an
Page 20 and 21: has taken 30 years to start to iden
Page 22 and 23: 1.3.1 Changes in Watershed Hydrolog
Page 24 and 25: A well-designed plan requires consi
Page 26 and 27: 1.5.1 Nonstructural Controls Nonstr
Page 28 and 29: CHAPTER 2 - Stormwater Management S
Page 30 and 31: applications. These regulations are
Page 32 and 33: • Description of how the Runoff R
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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
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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 80 and 81: Plan View Of A Bioretention Cell Fi
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
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6.5.1 Local Agency Contact Informat
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CHAPTER 7 - Riparian Setbacks _____
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Floodplains perform crucial roles,
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are ecologically compatible and emp
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yards, recycling facilities, quarri
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8.2 Lands Subject to These Control
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more than 1.0 foot. (Some jurisdict
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• 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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