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Stormwater Manual - Pima County Flood Control District

Stormwater Manual - Pima County Flood Control District

Stormwater Manual - Pima County Flood Control

Stormwater Manual Lexington-Fayette Urban County Government Lexington, Kentucky January 1, 2009

  • Page 2 and 3: CHAPTER 1 PURPOSE AND OVERVIEW
  • Page 4 and 5: 1.2 Purpose The regulated stormwate
  • Page 6 and 7: • groundwater flowing in the soil
  • Page 8 and 9: 1.4 General Criteria for New Develo
  • Page 10 and 11: In cases where neither the COE nor
  • Page 12 and 13: establish an easement to ensure tha
  • Page 14 and 15: The study area shall be based on fu
  • Page 16 and 17: 1.5.4 Downstream Study Limits Storm
  • Page 18 and 19: 1.6 Water Quality Criteria for New
  • Page 20 and 21: 1.7 Stormwater Standards for Redeve
  • Page 22 and 23: 1.8 Fee-In-Lieu for New Development
  • Page 24: 1.9 Allowable Uses in the Floodplai
  • Page 28 and 29: TABLE OF CONTENTS 2.1 Land Disturba
  • Page 30 and 31: 2.2 Kentucky Division of Water Floo
  • Page 32 and 33: Step 3: Determine if the Structure
  • Page 34 and 35: 2.4 Federal Emergency Management Ag
  • Page 36 and 37: CHAPTER 3 WATERSHED STUDIES
  • Page 38 and 39: 3.2 Data Collection 3.2.1 Data Sour
  • Page 40 and 41: • Inventory the sinkholes and the
  • Page 42 and 43: • Calculate the stage-discharge c
  • Page 44 and 45: • right bank = Manning’s n from
  • Page 46 and 47: • Flood Plain Delineations and St
  • Page 48 and 49: APPENDIX 3- B - EXAMPLE FIELD INVEN
  • Page 50 and 51: CHAPTER 4 DESIGN DOCUMENTATION
  • Page 52 and 53:

    4.2 Purpose The purpose of this cha

  • Page 54 and 55:

    • pipe lengths, slopes, diameters

  • Page 56 and 57:

    • flow arrows that indicate the d

  • Page 58 and 59:

    CHAPTER 5 HYDROLOGY

  • Page 60 and 61:

    5.2 Approved Methods 5.2.1 Single E

  • Page 62 and 63:

    5.4 HEC-HMS Model 5.4.1 Input Param

  • Page 64 and 65:

    TABLE 5- 3 CURVE NUMBERS Urban Area

  • Page 66 and 67:

    5.5.2 Subwatershed Width Calculatio

  • Page 68 and 69:

    5.6 Rational Method The following e

  • Page 70 and 71:

    1-HOUR RAINFALL DISTRIBUTIONS Cumul

  • Page 72 and 73:

    10-YEAR - 24-HOUR RAINFALL DISTRIBU

  • Page 74 and 75:

    HISTORIC RAINFALL DISTRIBUTIONS Cum

  • Page 76 and 77:

    6.1 Design Criteria 6.1.1 General T

  • Page 78 and 79:

    6.2 Inlet Design Procedures 6.2.1 C

  • Page 80 and 81:

    6.3 Storm Sewer Design Procedures U

  • Page 82 and 83:

    CHAPTER 7 CULVERTS AND BRIDGES

  • Page 84 and 85:

    7.2 Culvert Design Criteria 7.2.1 G

  • Page 86 and 87:

    7.3 Culvert Design Procedures 7.3.1

  • Page 88 and 89:

    7.4 Bridge Design Criteria 7.4.1 Ge

  • Page 90 and 91:

    7.6 Construction Specifications 7.6

  • Page 92 and 93:

    8.1 Introduction Constructed channe

  • Page 94 and 95:

    Q = (1.49/n)AR 2/3 S 1/2 Where: Q =

  • Page 96 and 97:

    TABLE 8- 3 SUMMARY OF CRITICAL TRAC

  • Page 99 and 100:

    CHAPTER 9 STREAMBANK STABILIZATION

  • Page 101 and 102:

    9.2 Vegetative Streambank Stabiliza

  • Page 103 and 104:

    anchored at the top of streambanks

  • Page 105 and 106:

    Herbaceous Species Rice cutgrass Ma

  • Page 107 and 108:

    status of individual planting sites

  • Page 109 and 110:

    TABLE 9- 2 NATIVE PLANT SPECIES SUI

  • Page 111 and 112:

    Coir logs shall be used in place of

  • Page 113 and 114:

    This process shall be repeated unti

  • Page 115 and 116:

    9.5 Structural Streambank Stabiliza

  • Page 128 and 129:

    CHAPTER 10 STORMWATER BEST MANAGEME

  • Page 130 and 131:

    10.2 General Design Criteria Stormw

  • Page 132 and 133:

    10.3 Bioretention Systems Bioretent

  • Page 134 and 135:

    Provide shredded hardwood mulch age

  • Page 136 and 137:

    Design Criteria Large void spaces i

  • Page 138 and 139:

    Design Criteria Biofiltration swale

  • Page 140 and 141:

    (h:v). Design the access way to con

  • Page 142 and 143:

    10.5 Sand and Organic Filters In ge

  • Page 144 and 145:

    k = coefficient of permeability for

  • Page 146 and 147:

    Design Procedures Design procedures

  • Page 148 and 149:

    For a compost filter bed, place a m

  • Page 150 and 151:

    10.7 Detention Ponds A detention po

  • Page 152 and 153:

    All conduits used for principal spi

  • Page 154 and 155:

    Pipe bedding shall meet the require

  • Page 156 and 157:

    10.8 Extended Detention Ponds In th

  • Page 158 and 159:

    A = surface area of filter = width

  • Page 160 and 161:

    Soil Classification System) and sta

  • Page 162 and 163:

    10.10 Constructed Wetlands Construc

  • Page 164:

    TABLE 10- 2 WETLAND SURFACE AREA Su

  • Page 181 and 182:

    TABLE OF CONTENTS 11.1 Purpose ....

  • Page 183 and 184:

    11.2 Requirements This section list

  • Page 185 and 186:

    In addition, the following shall ap

  • Page 187 and 188:

    11.2.3 Structural Practices for Soi

  • Page 189 and 190:

    Level Spreader Level spreaders shal

  • Page 191 and 192:

    11.3 Erosion and Sediment Control P

  • Page 193 and 194:

    The education and training requirem

  • Page 195 and 196:

    washed. Aggregate cover shall only

  • Page 197 and 198:

    The mulch shall be spread uniformly

  • Page 199 and 200:

    Mulch Tackifiers/Nettings/Emulsions

  • Page 201 and 202:

    No sod shall be placed when the tem

  • Page 203 and 204:

    11.4.6 Construction Entrance A stab

  • Page 205 and 206:

    Mulch with mulch binders may be use

  • Page 207 and 208:

    For calculated outlet velocities of

  • Page 209 and 210:

    Any high sediment-producing area ab

  • Page 211 and 212:

    The grade of the channel for the la

  • Page 213 and 214:

    Check for erosion at the outlet poi

  • Page 215 and 216:

    Coir and wood fiber logs shall be l

  • Page 217 and 218:

    This standard establishes minimum a

  • Page 219 and 220:

    Pipe Spillway Design Criteria The c

  • Page 221 and 222:

    Seedbed preparation, seeding, ferti

  • Page 223 and 224:

    Maintenance Silt fences and filter

  • Page 225 and 226:

    land undergoing development where t

  • Page 227 and 228:

    11.5.7 Temporary Stream Crossing A

  • Page 229 and 230:

    Pump stream flow around the check d

  • Page 231 and 232:

    11.6 Erosion Control Requirements f

  • Page 260 and 261:

    CHAPTER 12 MAINTENANCE MANUAL FOR S

  • Page 262 and 263:

    The manual also includes a checklis

  • Page 264 and 265:

    • Up and downstream channel condi

  • Page 266 and 267:

    • Obstructions of the inlet or ou

  • Page 268 and 269:

    Specific corrective maintenance act

  • Page 270 and 271:

    inlets, determine mowing or vegetat

  • Page 272 and 273:

    maintained and replanted early enou

  • Page 274 and 275:

    • Revegetate the contributing are

  • Page 276 and 277:

    12.9 Stormwater Filters 12.9.1 Desc

  • Page 278 and 279:

    Inspection Checklists

  • Page 280 and 281:

    Lexington-Fayette Urban County Gove

  • Page 282 and 283:

    Action to be taken: If any of the a

  • Page 284 and 285:

    4Biofiltration Facility Maintenance

  • Page 286 and 287:

    5Infiltration Paving Maintenance In

  • Page 288 and 289:

    If any of the answers to the above

  • Page 290 and 291:

    traps was changed from 1/2 of the d

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