Stormwater Manual - Pima County Flood Control District

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12.9 <strong>Stormwater</strong> Filters 12.9.1 Description A family of stormwater treatment practices which typically consist of a storage BMP in conjunction with a filtering device. The most common filter media is sand, but filters have been made of peat/sand mixtures and even from leaf compost. 12.9.2 Pollutant Removal Mechanisms • Settling or sedimentation • Filtration by sand or other filter media • Microbial uptake and/or transformations 12.9.3 Operation, Maintenance, and Inspection Operation Successful operation depends on good design, construction, and most importantly, on regular maintenance, especially of the filter media to prevent clogging. Maintenance Activities necessary to maintain the long term functioning of stormwater filtrations systems include: • Grass mowing and removal from side slopes and the embankment • Removal of trees, brush, and animal burrows from the embankment • Vegetative cover stabilization to prevent erosion of side slopes and the embankment • Removal and disposal of trash and debris, especially from inlet or outlet structures • Removal of sediments and other materials that accumulate in pretreatment practices, such as sediment traps and forebays • Periodic scraping and aeration of the filter media, with partial removal Inspection • Inspect monthly and after large storms to assure proper discharge, monitor accumulations of trash and debris, monitor sediment, accumulations in forebays or inlets, determine mowing or vegetation removal needs, and determine whether the filter media is clogging. • Closely monitor clogging of the filter media to determine when maintenance is needed. • Monitor sediment accumulations in sediment traps semiannually. Sediments should be removed when 25% of the storage volume has been lost. 12.9.4 Responsibility of Commercial Property Owner • Conduct all required maintenance. STORMWATER MANUAL 12-16 January 1, 2009 LEXINGTON-FAYETTE CO., KY
12.10 Prefabricated Treatment Devices 12.10.1 Description These BMPs consist of flow-through concrete structures with a settling or separation unit. 12.10.2 Pollutant Removal Mechanisms • Swirl action • Indirect filtration 12.10.3 Operation, Maintenance, and Inspection Operation Successful operation depends on good design, construction, and, most importantly, on regular cleaning. Maintenance Activities necessary to maintain the long-term functioning of stormwater filtration systems include: • Removal of sediments and other materials that accumulate in the device Inspection Inspect monthly and after large storms to assure proper operation. STORMWATER MANUAL 12-17 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
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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
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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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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: 12.8 Modular Pavement 12.8.1 Descri
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
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Stormwater Manual - Pima County Flood Control District

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