Stormwater Manual - Pima County Flood Control District

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TABLE 8- 3 SUMMARY OF CRITICAL TRACTIVE FORCES FOR VARIOUS PROTECTION MEASURES Protective Cover τc(lbs/ft 2 ) Grass or Grass-legume Mixture 1.0 Good Stand Jute Net 0.45 Straw with Net 1.45 Curled Wood Mat 1.55 Turf Reinforcement Matting (TRM) 6-10 Riprap D50 = 6 inches D50 = 12 inches 2.50 5.00 8.2.6 Maintenance Channels shall be inspected regularly to check for points of scour or bank failure; rubbish or channel obstruction; rodent holes; breaching; and excessive wear from pedestrian or construction traffic. Channels shall be repaired at the time damage is detected. Sediment deposits shall be removed from adjoining vegetative filter strips when they are visible. Channels shall be reseeded and fertilized as needed to establish vegetative cover. STORMWATER MANUAL 8-5 January 1, 2009 LEXINGTON-FAYETTE CO., KY.
8.3 Paved Channels A paved channel shall be used when the flow velocity at design capacity (using vegetative lining) exceeds 12 fps. 8.3.1 Design Criteria Paved channels shall be designed to carry the peak flow from the 100-year storm. The outlets of paved channels shall be protected from erosion using gabion mattresses. The length of the gabion mattress shall be one foot for each one fps of velocity. The width of the gabion mattress shall extend one foot in elevation beyond the top elevation of the paved channel. Cutoff walls shall be constructed at the beginning and end of each channel except where the channel connects with a catch basin or inlet. 8.3.2 Material Specifications Paved channels shall be constructed of concrete or interlocking concrete blocks. 8.3.3 Construction Specifications The subgrade shall be constructed to the required elevations. All soft sections and unsuitable material shall be removed and replaced with suitable material. The subgrade shall be thoroughly compacted and shaped to a smooth, uniform surface. The subgrade shall be moist when pouring concrete. 8.3.4 Maintenance Before permanent stabilization of the slope, the structure shall be inspected after each rainfall. Any damages to the channel or slope shall be repaired immediately. STORMWATER MANUAL 8-6 January 1, 2009 LEXINGTON-FAYETTE CO., KY.
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Stormwater Manual Lexington-Fayette
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1.1 Introduction Chapter 1 gives th
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1.3 Definitions 1.3.1 Public Draina
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• the Division of Engineering det
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• Masterson Station Watershed hyd
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• only one corporation or busines
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1.5 Water Quantity Criteria for New
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TABLE 1- 1 OPTIONS FOR STORMWATER M
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TABLE 1- 2 FLOW CRITERIA FOR STORMW
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contained in Chapter 10. The water
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1.7.4 Water Quality Criteria for Re
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• new development commercial site
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CHAPTER 2 PERMITS
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2.1 Land Disturbance Permit 2.1.1 P
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If the analysis described in the de
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2.3 Kentucky Division of Water KPDE
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2.5 401 and 404 Permits - Kentucky
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3.1 Introduction Watershed studies
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• detailed description of any nat
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3.3 Runoff Models 3.3.1 General The
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3.4 Post-Development Floodplain Ana
Page 45 and 46: APPENDIX 3-A - SOURCES OF DATA
Page 47 and 48: National Oceanography and Atmospher
Page 49 and 50: Pond/Culvert Inventory Data Sheet P
Page 51 and 52: 4.1 Overview 4.1.1 Introduction An
Page 53 and 54: 4.3 Improvement Plans 4.3.1 50 Perc
Page 55 and 56: • culvert outlet appurtenances an
Page 57 and 58: 4.4 Record Drawings A record drawin
Page 59 and 60: 5.1 Introduction 5.1.1 Purpose The
Page 61 and 62: 5.3 Design Rainfall Event 5.3.1 Sin
Page 63 and 64: TABLE 5- 2 GREEN-AMPT INFILTRATION
Page 65 and 66: 5.5 Stormwater Management Model (SW
Page 67 and 68: TABLE 5- 4 MANNINGS N FOR OVERLAND
Page 69 and 70: APPENDIX 5 A DESIGN STORM DISTRIBUT
Page 71 and 72: 6-HOUR RAINFALL DISTRIBUTIONS Cumul
Page 73 and 74: 100-YEAR - 24-HOUR RAINFALL DISTRIB
Page 75 and 76: CHAPTER 6 INLETS / STORM SEWERS / M
Page 77 and 78: 6.1.4 Storm Sewers Storm sewers sha
Page 79 and 80: For d ≥ 1.0’, use the orifice f
Page 81 and 82: 6.4 Construction Specifications All
Page 83 and 84: 7.1 Introduction As used in this ma
Page 85 and 86: 7.2.6 Culvert Skew A culvert shall
Page 87 and 88: Barrel Area and Shape Barrel area i
Page 89 and 90: 7.5 Bridge Design Procedures Use HE
Page 91 and 92: CHAPTER 8 CONSTRUCTED CHANNELS
Page 93 and 94: 8.2 Permanent Constructed Channels
Page 95: The earth fill materials used to co
Page 100 and 101: 9.1 Introduction The streams of Fay
Page 102 and 103: 9.2.3 Material Specifications Veget
Page 104 and 105: TABLE 9- 1 SUGGESTED RIPARIAN SPECI
Page 106 and 107: 9.3 Riparian Buffer Zones 9.3.1 Gen
Page 108 and 109: 9.4 Bioengineering Techniques Bioen
Page 110 and 111: 9.4.3 Root Wad Revetment Root wad r
Page 112 and 113: Dead stout stakes shall be installe
Page 114 and 115: Willow tree species are the best fo
Page 116: 9.5.3 Maintenance All structures sh
Page 129 and 130: 10.1 Introduction Non-point source
Page 131 and 132: TABLE 10- 1 WATER QUALITY DEPTH VER
Page 133 and 134: Grade the top of the planting soil
Page 135 and 136: 10.4 Infiltration Systems Infiltrat
Page 137 and 138: Design Criteria To be considered a
Page 139 and 140: If desired, large infiltration basi
Page 141 and 142: When the contributing area draining
Page 143 and 144: Provide sufficient access to the de
Page 145 and 146: Select underdrain gravel to meet AA
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Compute the total surface area of b
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10.6 Prefabricated Treatment Device
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landscaping plan for the pond and t
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When necessary, compact subgrade su
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After the embankment has been built
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Embankment heights shall not exceed
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10.9 Wet Ponds In this manual, wet
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Q = A (2gH) 0.5 /(1 + K e +K b + K
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Provide a drain with a valve at the
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CHAPTER 11 EROSION AND SEDIMENT CON
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11.1 Purpose This chapter describes
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1. The limitations on coverage set
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11.2.2 Non-Structural Practices Thi
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Figure 11-1. “Seed mats” may be
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peak discharges during construction
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Locations of proposed controls, uti
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11.4 Structural Soil Stabilization
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When using a mulch net, it shall be
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Material Specifications Seed shall
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Material Specifications Soil materi
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11.4.5 Road/Parking Stabilization R
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To reduce maintenance and loss of a
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Effective netting and matting requi
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Maintenance Outlets shall be inspec
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Temporary or permanent seeding and
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A standard flared end section or a
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11.5 Structural Sediment Control BM
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The amount of sediment entering a t
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Detention storage shall be provided
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The emergency spillway shall have a
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PHYSICAL PROPERTY Filtering Efficie
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Fasten fabric securely to the stake
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SEEDING MIXTURE AND SITE SUITABILIT
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Upon removal of the structure, the
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11.5.10 Concrete Washout Pits Concr
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Inspection of Sediment Controls The
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12.1 Introduction As Fayette County
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12.2 Dry Detention Pond 12.2.1 Desc
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12.3 Dry Extended Detention Pond 12
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12.4 Wet Detention Pond 12.4.1 Desc
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12.5 Constructed Wetlands 12.5.1 De
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12.6 Biofiltration Practices 12.6.1
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12.7 Infiltration Practices 12.7.1
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12.8 Modular Pavement 12.8.1 Descri
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12.10 Prefabricated Treatment Devic
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1Lexington-Fayette Urban County Gov
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2Infiltration Basin Maintenance Ins
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3Infiltration Swale Maintenance Ins
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Action to be taken: If any of the a
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6Filtration Facility Maintenance In
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Summary of Changes to the LFUCG Sto
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11.5.5 Storm Drain Inlet Protection
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Stormwater Manual - Pima County Flood Control District

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