Stormwater Manual - Pima County Flood Control District

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Material Specifications Seed shall be applied in a mixture based upon the season and ultimate use of the site. Erosion and sediment control plans submitted to LFUCG shall include seed mixtures, rates, and planting dates selected for permanent seeding. Permanent seeding may be done at any time except December through February. Seed, fertilizer, and mulch specifications are listed in the KY Erosion Prevention and Sediment <strong>Control</strong> Field Guide. Soil material shall be capable of supporting permanent vegetation and have at least 25 percent silt and clay to provide an adequate amount of moisture holding capacity. An excessive amount of sand will not consistently provide sufficient moisture for good growth regardless of other soil factors. Construction Specifications During site preparation, topsoil shall be stockpiled for use in establishing permanent vegetation. The site shall be graded as needed to permit the use of conventional equipment for seedbed preparation, seeding, mulch application, and anchoring. The needed erosion control practices shall be installed prior to seeding such as diversions, temporary waterways for diversion outlets, and sediment ponds. Prior to seeding, work the lime and fertilizer into the soil with a disk harrow, springtooth harrow, or similar tools to a depth of four inches. On sloping areas, the final operation shall be on the contour. Where compacted soils occur, they should be broken up sufficiently to create a favorable rooting depth of six to eight inches. The seed shall be applied uniformly with a cyclone seeder, drill, cultipacker, seeder, or hydroseeder (slurry may include seed and fertilizer) preferably on a firm, moist seedbed. Seed no deeper than one-fourth inch to one-half inch. When feasible, except where a cultipacker type seeder is used, the seedbed shall be firmed following seeding operations with a cultipacker, roller, or light drag. On sloping land, seeding operations shall be on the contour wherever possible. Mulch shall be applied to protect the soil and provide a better environment for plant growth. The mulch shall be spread uniformly by hand or mechanically so the soil surface is covered. Following application, the mulch shall be anchored or otherwise secured to the ground according to one of the following methods: Mechanical – Use a disk, crimper, or similar type tool set straight to punch or anchor the mulch material into the soil. STORMWATER MANUAL 11-17 August 29, 2011 LEXINGTON-FAYETTE CO., KY.
Mulch Tackifiers/Nettings/Emulsions – Use according to the manufacturer’s recommendations. This is a superior method in areas of water concentration to hold mulch in place. Wood Fiber – Wood fiber hydroseeder slurries may be used to tack straw mulch. This combination treatment is well suited to steep slopes and critical areas, and severe climate conditions. For more detailed information on mulch application, see Section 11.4.1- Mulch. Maintenance New seed shall have adequate water for growth, through either natural means or irrigation, until plants are firmly established. Seeded areas shall be inspected every two weeks after planting and after each rainfall of 0.5 inches or more. Areas requiring additional seed and mulch shall be repaired within 48 hours. If vegetative cover is not established within 21 days, the area shall be reseeded. If less than 70 percent groundcover is established, seed and fertilize, using half of rates originally applied, and mulch. If less than 40 percent groundcover occurs, follow original seedbed preparation methods, seeding and mulching recommendations, and apply lime and fertilizer as needed according to soil tests. 11.4.4 Sod Sod is used to stabilize fine-graded disturbed areas by establishing permanent grass stands. Sod has several purposes or applications including: establishment of permanent turf immediately prevention of erosion and damage from sediment and runoff by stabilization of the soil surface reduction of dust and mud associated with bare soil surfaces stabilization of drainageways where concentrated overland flow will occur Design Criteria Sodding shall be used for disturbed areas that require immediate vegetative cover. Locations particularly suited to stabilization with sod include waterways carrying intermittent flow and the area around drop inlets in grassed waterways. The species of sod selected shall be based on soil type, planned use of the area, and the amount of maintenance that can be devoted to the area in the future. Sod shall not be used to provide erosion control and prevent soil slippage on a soil that is not stable due to its structure, water movement, or excessive slope. Sod shall be installed within 36 hours of digging and removal from the field. Sod should not be used on slopes steeper than 2H:1V. If it is to be mowed, installation should be on slopes no greater than 3H:1V. STORMWATER MANUAL 11-18 August 29, 2011 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
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APPENDIX 3-A - SOURCES OF DATA
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National Oceanography and Atmospher
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Pond/Culvert Inventory Data Sheet P
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4.1 Overview 4.1.1 Introduction An
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4.3 Improvement Plans 4.3.1 50 Perc
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• culvert outlet appurtenances an
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4.4 Record Drawings A record drawin
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5.1 Introduction 5.1.1 Purpose The
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5.3 Design Rainfall Event 5.3.1 Sin
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TABLE 5- 2 GREEN-AMPT INFILTRATION
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5.5 Stormwater Management Model (SW
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TABLE 5- 4 MANNINGS N FOR OVERLAND
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APPENDIX 5 A DESIGN STORM DISTRIBUT
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6-HOUR RAINFALL DISTRIBUTIONS Cumul
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100-YEAR - 24-HOUR RAINFALL DISTRIB
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CHAPTER 6 INLETS / STORM SEWERS / M
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6.1.4 Storm Sewers Storm sewers sha
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For d ≥ 1.0’, use the orifice f
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6.4 Construction Specifications All
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7.1 Introduction As used in this ma
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7.2.6 Culvert Skew A culvert shall
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Barrel Area and Shape Barrel area i
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7.5 Bridge Design Procedures Use HE
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CHAPTER 8 CONSTRUCTED CHANNELS
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8.2 Permanent Constructed Channels
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The earth fill materials used to co
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8.3 Paved Channels A paved channel
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9.1 Introduction The streams of Fay
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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
Page 147 and 148: Compute the total surface area of b
Page 149 and 150: 10.6 Prefabricated Treatment Device
Page 151 and 152: landscaping plan for the pond and t
Page 153 and 154: When necessary, compact subgrade su
Page 155 and 156: After the embankment has been built
Page 157 and 158: Embankment heights shall not exceed
Page 159 and 160: 10.9 Wet Ponds In this manual, wet
Page 161 and 162: Q = A (2gH) 0.5 /(1 + K e +K b + K
Page 163 and 164: Provide a drain with a valve at the
Page 180 and 181: CHAPTER 11 EROSION AND SEDIMENT CON
Page 182 and 183: 11.1 Purpose This chapter describes
Page 184 and 185: 1. The limitations on coverage set
Page 186 and 187: 11.2.2 Non-Structural Practices Thi
Page 188 and 189: Figure 11-1. “Seed mats” may be
Page 190 and 191: peak discharges during construction
Page 192 and 193: Locations of proposed controls, uti
Page 194 and 195: 11.4 Structural Soil Stabilization
Page 196 and 197: When using a mulch net, it shall be
Page 200 and 201: Material Specifications Soil materi
Page 202 and 203: 11.4.5 Road/Parking Stabilization R
Page 204 and 205: To reduce maintenance and loss of a
Page 206 and 207: Effective netting and matting requi
Page 208 and 209: Maintenance Outlets shall be inspec
Page 210 and 211: Temporary or permanent seeding and
Page 212 and 213: A standard flared end section or a
Page 214 and 215: 11.5 Structural Sediment Control BM
Page 216 and 217: The amount of sediment entering a t
Page 218 and 219: Detention storage shall be provided
Page 220 and 221: The emergency spillway shall have a
Page 222 and 223: PHYSICAL PROPERTY Filtering Efficie
Page 224 and 225: Fasten fabric securely to the stake
Page 226 and 227: SEEDING MIXTURE AND SITE SUITABILIT
Page 228 and 229: Upon removal of the structure, the
Page 230 and 231: 11.5.10 Concrete Washout Pits Concr
Page 232: 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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