Stormwater Manual - Pima County Flood Control District

More documents

Recommendations

Info

9.2.3 Material Specifications Vegetation shall consist of herbaceous ground cover and/or woody shrubs and trees. Installation methods shall include direct seeding and/or the planting of bare root seedlings, hardwood cuttings, and/or containerized plants. Direct seeding shall only be conducted during March 1 to May 15 or August 1 to September 30. Bare root and cutting installation shall only be conducted during December 1 to March 15. Installation of containerized plants shall only be conducted during March 1 to May 15 and September 1 to December 31. The surface shall be mulched with clean wheat straw at a rate of 2 tons per acre. Mulch shall be secured as described in the section on mulch. If mulch tackifiers or related methods are not applicable then erosion control matting or turf reinforcement matting (TRMs) shall be used. Many types of erosion control mats and TRMs are available from various manufacturers. Some are considered temporary because they are manufactured of organic materials that will degrade over time. Due to wildlife endangerment problems associated with the UV resistant mesh in some erosion control matting, only materials with fully degradable mesh shall be used as mulch blankets. Non-degradable products (TRMs) are appropriate where turf reinforcement is necessary. The material shall be chosen based on calculated tractive forces in accordance with manufacturers’ recommendations (See Chapter 8). If nursery stock (bare root or containerized) is used, the species listed in Table 9-1 shall be used for establishing vegetation. Direct seeding of the herbaceous species listed below shall also be used. Selected species shall be based upon the native vegetation of the watershed where work is proposed and shall reflect the original stream bank species. Exotic or pest species shall not be used. See Section 9.4.2 for recommended species and installation requirements of hardwood cuttings. 9.2.4 Construction Specifications Prior to seeding or planting, only fallen trees, stumps, and other debris that may force stream flow into the streambank shall be removed. Leaving other debris may be desirable for aquatic habitat. Where feasible, the streambank side slope shall be cut back to 3:1 slope or flatter and overhanging bank edges shall be removed. Direct seeding areas shall be roughened with a rake or similar tool. Seeding rates shall be a minimum of 10 lbs. per 1000 square feet of disturbed area. Erosion control matting or turf reinforcement matting shall be installed in accordance with manufacturers’ requirements. Erosion control fabrics, blankets, mats and nettings shall be STORMWATER MANUAL 9-3 January 1, 2009 LEXINGTON-FAYETTE CO., KY.
anchored at the top of streambanks by excavating a shallow trench. The material shall be laid in the bottom of trench with overlap. The trench shall be backfilled with excavated soil. The overlap material shall be laid on top of backfill and secured with dead stout stakes, metal staples, or according to manufacturer’s specifications (see Figure 9-1). Bare root or containerized stock shall be planted at the same depth as planted in the nursery. The stock shall be planted in a hole large enough to accommodate the root system when well spread. Trees and shrubs shall be planted to achieve a minimum density of 300 live stems per acre after three years. 9.2.5 Maintenance Banks shall be checked after every high water event. Gaps in vegetative cover shall be repaired at once with new plants and mulched if necessary. Exotic and pest species that become established on the bank shall be removed. STORMWATER MANUAL 9-4 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 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 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 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
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 198 and 199:
Material Specifications Seed shall
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
Page 261 and 262:
12.1 Introduction As Fayette County
Page 263 and 264:
12.2 Dry Detention Pond 12.2.1 Desc
Page 265 and 266:
12.3 Dry Extended Detention Pond 12
Page 267 and 268:
12.4 Wet Detention Pond 12.4.1 Desc
Page 269 and 270:
12.5 Constructed Wetlands 12.5.1 De
Page 271 and 272:
12.6 Biofiltration Practices 12.6.1
Page 273 and 274:
12.7 Infiltration Practices 12.7.1
Page 275 and 276:
12.8 Modular Pavement 12.8.1 Descri
Page 277 and 278:
12.10 Prefabricated Treatment Devic
Page 279 and 280:
1Lexington-Fayette Urban County Gov
Page 281 and 282:
2Infiltration Basin Maintenance Ins
Page 283 and 284:
3Infiltration Swale Maintenance Ins
Page 285 and 286:
Action to be taken: If any of the a
Page 287 and 288:
6Filtration Facility Maintenance In
Page 289 and 290:
Summary of Changes to the LFUCG Sto
Page 291:
11.5.5 Storm Drain Inlet Protection
show all

Stormwater Manual - Pima County Flood Control District

You also want an ePaper? Increase the reach of your titles

Delete template?

Save as template?