Stormwater Management Standards Manual - Toledo Metropolitan ...

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f. HEC-RAS used for FEMA Studies 3.3.3 Downstream Analysis Downstream analysis of the impacts of drainage improvements may be required by the local reviewing agency. Analysis of downstream facilities will not be required when: a. All discharge is retained on-site after the completion of improvements b. Site improvements where the stormwater facilities have been designed such that: i. The combination of flows from off-site and on-site drainage areas results in no increase in the peak discharge from the pre-developed site during the 2- year through 100-year, 24-hour storm events. ii. The volume of runoff for the project site is not increased for the 2-year through 100-year, 24-hour storm events. iii. The increase in the water level stage in the receiving water source is less than 0.1 feet immediately downstream of the outlet for the project area during peak flow for the design storm event. c. Allowable discharge may be less than a five (5)-year pre-developed storm outflow due to inadequate outletting stream or storm sewer. Check with local communities for undersized storm sewers or streams. Summary of Required Storage Volumes Sizing Criteria Description Water Quality Volume (WQ v ) (acre-feet) or “First Flush” WQ v = [(P)(R v )(DA)]/12 P = Rainfall depth in inches and is equal to 0.75”. R v = Volumetric Runoff Coefficient = 0.05+0.009(I), where I = % impervious cover of the drainage area, or as per Table 3-6. DA = Drainage Area to BMP in acres Water quality volume draw down time 24 hours Extreme Flood Volume (Q f ) (acre-feet) or “Flood Attenuation” Maximum release rate Q f = Minimum 25-year, 24-hour storm event. Pre-development 5-year, 24-hour storm event Table 3- 3 Summary of Required Storage Volumes Third Edition Stormwater Standards Manual September 2008 Page 46
Runoff Coefficients Based on the Type of Land Use Land Use Runoff Coefficient Industrial and Commercial 0.8 High Density Residential (>8 dwellings/acre) 0.5 Medium Density Residential (4-8 dwellings/acre) 0.4 Low Density Residential (
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Page 4 and 5: 3.5.3 Drainage Structure Location .
Page 6 and 7: 8.2.2 Regulatory Floodway..........
Page 8 and 9: GROUND WATER TABLE ................
Page 10 and 11: TN ................................
Page 12 and 13: 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
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 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 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
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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
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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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