Stormwater Manual - Pima County Flood Control District

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1-HOUR RAINFALL DISTRIBUTIONS Cumulative Rainfall (Inches) Minutes 1 year 10-year 100-year 0 0.00 0.00 0.00 3 0.14 0.24 0.34 6 0.26 0.44 0.63 9 0.40 0.65 0.94 12 0.52 0.85 1.23 15 0.65 1.07 1.54 18 0.76 1.25 1.80 21 0.85 1.41 2.02 24 0.92 1.52 2.19 27 0.97 1.60 2.31 30 1.01 1.66 2.39 33 1.04 1.72 2.48 36 1.07 1.76 2.54 39 1.10 1.82 2.62 42 1.13 1.86 2.68 45 1.15 1.90 2.74 48 1.16 1.92 2.76 51 1.18 1.94 2.79 54 1.19 1.96 2.82 57 1.19 1.96 2.82 60 1.20 1.98 2.85 STORMWATER MANUAL 5-A-1 January 1, 2009 LEXINGTON-FAYETTE CO., KY.
6-HOUR RAINFALL DISTRIBUTIONS Cumulative Rainfall (Inches) Minutes 10-year 100-year 0 0.00 0.00 20 0.10 0.16 40 0.24 0.36 60 0.37 0.57 80 0.59 0.90 100 0.86 1.32 120 1.15 1.76 140 1.47 2.26 160 1.81 2.79 180 2.09 3.22 200 2.32 3.58 220 2.51 3.87 240 2.65 4.08 260 2.76 4.25 280 2.85 4.38 300 2.93 4.51 320 2.97 4.58 340 3.01 4.63 360 3.07 4.73 STORMWATER MANUAL 5-A-2 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
Page 19 and 20: contained in Chapter 10. The water
Page 21 and 22: 1.7.4 Water Quality Criteria for Re
Page 23 and 24: • new development commercial site
Page 27 and 28: CHAPTER 2 PERMITS
Page 29 and 30: 2.1 Land Disturbance Permit 2.1.1 P
Page 31 and 32: If the analysis described in the de
Page 33 and 34: 2.3 Kentucky Division of Water KPDE
Page 35 and 36: 2.5 401 and 404 Permits - Kentucky
Page 37 and 38: 3.1 Introduction Watershed studies
Page 39 and 40: • detailed description of any nat
Page 41 and 42: 3.3 Runoff Models 3.3.1 General The
Page 43 and 44: 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: APPENDIX 5 A DESIGN STORM DISTRIBUT
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 and 96: The earth fill materials used to co
Page 97: 8.3 Paved Channels A paved channel
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
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10.1 Introduction Non-point source
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TABLE 10- 1 WATER QUALITY DEPTH VER
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Grade the top of the planting soil
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10.4 Infiltration Systems Infiltrat
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Design Criteria To be considered a
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If desired, large infiltration basi
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When the contributing area draining
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Provide sufficient access to the de
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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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