Stormwater Manual - Pima County Flood Control District

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4.2 Purpose The purpose of this chapter is to present the documentation that will be included in the design files and on the construction plans. This chapter focuses on the documentation of the findings obtained in using the other chapters of this manual, and thus engineers should be familiar with the hydrologic and hydraulic design procedures associated with this manual. This chapter identifies LFUCG’s system for organizing the documentation of hydraulic designs and reviews so as to provide as complete a history of the design process as is practical. The major purpose of providing good documentation is to define the design procedure that was used and decisions that were made to arrive at the final design. Documentation should be viewed as the record of reasonable and prudent design analysis based on the best available technology. Thus, good documentation can provide the following: • identification of the situation at the time of design which might be very important if legal action occurs in the future • protection for the engineer by proving that reasonable and prudent actions were, in fact, taken (such proof should certainly not increase a potential court award and may decrease it by disproving claims of negligence by the plaintiff) • documentation that generally accepted procedures and analysis were used at the time of the design which were commensurate with the perceived site complexity and flood hazard (this should further disprove negligence claims) • a continuous site history to facilitate future reconstruction • the file data necessary to quickly evaluate future site problems that might occur during the facility’s service life • expedited plan development by clearly providing the reasons and rationale for specific design decisions STORMWATER MANUAL 4-2 January 1, 2009 LEXINGTON-FAYETTE CO., KY.
4.3 Improvement Plans 4.3.1 50 Percent Design The following information shall be submitted on a 2’ contour map at a scale of 1”=50’. The drawing size shall be 24” x 36”. • a map showing all drainage areas and subareas used to size hydraulic structures • proposed inlet, storm sewer, culvert, and manhole system and their sizing calculations • proposed stormwater best management practices • proposed constructed channels and their sizing calculations • 10-year and 100-year post development floodplains • FEMA floodplain • sinkholes • caves • springs • ponds • streams • wetlands • tree stands • steep slopes greater than 15% • greenways shown in the Greenway Master Plan • existing and proposed underground utilities • the sinkhole surface drainage analysis as described in the Subdivision Regulations 4.3.2 Final Design Final design drawings shall be 24 x 36” in size. Plan view drawings shall be at a scale of 1”=50’ with 2’ contours. Profile sheets shall be at a scale of 1”=50’ horizontal and 1”=5’ vertical. Hydrology Submit the following items: • watershed area size • peak discharge and hydrographs for design storms • expected level of development in upstream watershed over the anticipated life of the facility (include sources of basis for these development projections) Inlets, Storm Sewers, and Manholes Submit the following items: • computations for inlets and pipes, including hydraulic grade lines • complete drainage area map • a schematic indicating storm drain system layout STORMWATER MANUAL 4-3 January 1, 2009 LEXINGTON-FAYETTE CO., KY.
Page 1 and 2: Stormwater Manual Lexington-Fayette
Page 3 and 4: 1.1 Introduction Chapter 1 gives th
Page 5 and 6: 1.3 Definitions 1.3.1 Public Draina
Page 7 and 8: • the Division of Engineering det
Page 9 and 10: • Masterson Station Watershed hyd
Page 11 and 12: • only one corporation or busines
Page 13 and 14: 1.5 Water Quantity Criteria for New
Page 15 and 16: TABLE 1- 1 OPTIONS FOR STORMWATER M
Page 17 and 18: 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: 4.1 Overview 4.1.1 Introduction An
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 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
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TABLE 9- 1 SUGGESTED RIPARIAN SPECI
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9.3 Riparian Buffer Zones 9.3.1 Gen
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9.4 Bioengineering Techniques Bioen
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9.4.3 Root Wad Revetment Root wad r
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Dead stout stakes shall be installe
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Willow tree species are the best fo
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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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