BEsT MANAGEMENT PRACTICEs HANDbooK - Tahoe BMP

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Advantages• Assists in the control of stormwater runoff generated from impervioussurfaces.• By capturing stormwater, generally increases the time of concentration ofrunoff and thereby reduce peak runoff rate.• In most cases, this BMP can be installed on impervious surfaces thatexceed a 5 percent slope.Disadvantages• Has the potential to concentrate stormwater runoff and deliver highvolumes to one destination.• Generally converts surface-generated sheet flow to channel flow, therebyincreasing the potential for erosion.• Requires periodic removal of sediment and debris.DESIGN CONSIDERATIONS• Seek the advice of a licensed professional civil engineer to determine the bestplacement and type of slotted channel drain.• Use slotted channel drains with removable grates and sediment traps tomake maintenance easier and prevent sediment and debris from clogging thesystem (Refer to Section 4.4.2.6, Sediment Trap).• Include the following components into the design: channel, removablegrates, grate locks, end plate, inlet/outlet plate, and a sediment catch basin.INSTALLATION CONSIDERATIONS• Construct slotted channel drains consistent with the manufacturer’s designand installation specifications.• Installing channel slopes greater or equal to 1 percent will help to ensureproper flow and prevent freezing and standing water. As velocities in thechannel will be greater than velocities on pavement, the relative potentialfor freezing or silt buildup will be reduced.• Select a slotted channel drain that is rated to accommodate the vehicle loadsit will endure.INSPECTION AND MAINTENANCERefer to Table 4.3-4 Slotted Channel Drain Inspection and Maintenance forguidelinesEFFECTIVENESS CONSIDERATIONSSlotted drains are effective if designed and installed properly. Effectiveness islost once the drain is clogged with sediment and debris. Regular street andparking lot sweeping reduces maintenance cost and frequency. Frequentinspections of the drain for debris and sediment are required.Chapter 4: BMP ToolkitTRPA BMP Handbook4.3.1.7-Slotted Channel Drain 2012Page 2
Table 4.3-4: Slotted Channel Drain Inspection and MaintenanceINSPECTION AND MAINTENANCE ACTIVITIESSUGGESTEDFREQUENCYINSPECTIONEQUIPMENTMAINTENANCEEQUIPMENTInspect site for the presence of standing water 96 hours after precipitation events.• Contact your local vector abatement office for specific instructions if standing water is present.Inspect that the slotted channel drain is properly capturing runoff from the impervious surface and conveying it to theinfiltration/treatment system. The inspection crews should pour water using a hose or large water container on thesurface to verify performance. Be sure to check the entire length of the drain.• Repair any blocked or diverted conveyances and DO NOT store snow directly over the slotted channel drain.Inspect for accumulated sediment, debris, and litter.• Remove accumulated material as described below.• For drains with removable grates,o Remove grates and mark grates so they can be properly reinstalled.o Remove sediment and debris from channel drain by hand or using a vactor truck.o Dispose of sediment and debris in a TRPA approved stable on-site location or out of the Lake Tahoe Region.• For drains with non-removable grates,o Obtain access to an end of the channel drain.o Wash sediment and debris out of channel drain end by using pressure washer or vacuum sediment and debrisout of drain with a vactor truck. Use care not to wash sediment into a treatment or infiltration system.o Dispose of sediment and debris in a TRPA approved stable on-site location or out of the Lake Tahoe Region.Inspect for channel drain structural integrity. This is best performed after cleaning the drain of debris. For metal channeldrains with non-removable grates, poke the drain bottom with a piece of rebar to determine corrosion extent.• Repair or replace structurally suspect or deteriorated channel drains.Inspect the concrete or asphalt apron of the channel drain for chipping, cracking, or other damage.• Repair or replace structurally suspect or deteriorated aprons.Inspect for up slope contributing sediment sources to reduce the accumulation of sediment in the channel drain.• Stabilize contributing eroding slopes and bare soil areas to prevent sediment entry into drain.• Routinely sweep the street/driveway to remove sediment before it enters the channel drain.Inspect site for unusual or unsafe conditions (snowplow damage, structural damage, dumping, etc.).• Repair structural components as necessary.Monitor ongoing effectiveness and determine whether another BMP type or additional BMPs could improve long-termeffectiveness and improve benefits to costs versus the existing channel drain.• Analyze Inspection and Maintenance Log for trends or recurring issues.• Prepare a plan that more effectively addresses conveyance needs, reduces long term maintenance costs andimproves overall effectiveness and safety of the BMP.96 hours aftermajor stormsAnnuallyin springAnnuallyin spring andafter majorstormsAnnuallyAnnuallyAnnually inspring andbefore majorstormsAnnually inspringEvery 5 yearsWater SourceStadia RodOr Ruler3-f00t longrebarQualifiedInspector orConsultantTools suggested perqualified individualTools as needed torepairGrate removal tools,Pressure washeror Vactor truck,Trash bagTools as needed torepair or replaceTools as needed torepair or replaceSoil Amendment,Seeds/Plants, Irrigation,Mulch, Erosion ControlBlanket, Broom,StreetsweeperTools as neededQualified Inspector orConsultantTRPA BMP Handbook Chapter 4: BMP Toolkit2012 4.3.1.7-Slotted Channel DrainPage 3
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PREFACEThe Tahoe Regional Planning
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TABLE OF CONTENTSPREFACE...........
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3.5.5 Stormwater Treatment ........
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6.3 Projects 1 to 5 Acres and all C
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8.10.5 Maintenance ................
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Table 8-4: Federal, State and Regio
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Figure 4.3-i: Vegetated Swale .....
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INTRODUCTIONPURPOSE AND USERS OF TH
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Lake Tahoe’s world renowned blue
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Urbanization in the Lake Tahoe wate
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50 percent of the light scattering
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Figure I-c: Impervious Cover versus
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Disconnected impervious areasdrain
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POLLUTANT EFFECT URBAN SOURCES ASSO
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BEST MANAGEMENT PRACTICESHistorical
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Table I-2: Differences in BMP Retro
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CHAPTER 1: URBAN HYDROLOGY1.1 PURPO
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Figure 1-a: Runoff ProcessesTRPA BM
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Although many urbanized areas face
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watersheds to make the necessary es
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Pollutant load estimates are typica
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differ from the following recommend
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Figure 1-b: Hydrologic Processes an
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1.3.3.2 NRCS BMP CALCULATION SPREAD
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1.3.3.3 RATIONAL METHODMODEL SUMMAR
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1.3.3.4 LOAD REDUCTION PLANNING TOO
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in HMS may be event-based or contin
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1.3.3.6 POLLUTANT LOAD REDUCTION MO
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AVAILABILITY AND SUPPORTING DOCUMEN
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TYPICAL LEVEL OF EFFORTHSPF and LSP
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few days to a week of time to revie
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USACE studies recommended use of th
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during the initial site visit, or c
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Figure 2-a: Soil Horizons• Depth
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Evidence of compacted and disturbed
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UNMAPPED ROCK OUTCROPS, STEEP SLOPE
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The primary pollutants of concern o
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On the map use an arrow to delineat
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2.2.3 ADDITIONAL DATA GATHERINGAfte
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and allowable uses. Baseline Land C
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topographic survey will be required
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Table 2-3: Basis of Capability Clas
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Keep your property lean, clean,and
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treatment. This will reduce the mai
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ponds, wetlands, lakes, manmade cha
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2.3.3.2 SOILS HYDROLOGIC REPORTThe
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CHAPTER 3: PERMANENT BMP PLANNINGAN
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STORMWATER TREATMENTRepresents BMPs
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Table 3-1: Waste Management and Mat
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D. STABILIZE STEEP DISTURBED SLOPES
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This infiltration trench collects s
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3.5 PROJECTS 1 TO 5 ACRES AND ALL C
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This Page Blank.TRPA BMP HandbookCH
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unnecessary turf areas and replace
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Table 3-5: Waste Management and Mat
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3.5.2.3 SOIL STABILIZATIONA. RESTOR
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Left: Dripline erosion below a deck
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Pervious concrete parking pad locat
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3.5.5 STORMWATER TREATMENT3.5.5.1 M
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3.6.1.1 JURISDICTIONThese projects
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to perform required inspection and
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3.8.2.4 SHARED ACCESS AND EASEMENTS
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3.8.2.8 STREAM ENVIRONMENT ZONES (S
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Sediment versus erosion:Suspended s
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CONTENTSCHAPTER 4: BMP TOOLKIT ....
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CHAPTER 4: BMP TOOLKIT4.1 HYDROLOGI
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4.1.1.1 PERVIOUS PAVEMENTAlternativ
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• Tree canopy overhead can decrea
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ate determined at the time of insta
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Figure 4.1-a: Pervious ConcreteTRPA
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4.1.1.2 INFILTRATION BASINAlternati
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groundwater, depths to restrictive
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Very few performance monitoring stu
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INSPECTION AND MAINTENANCE ACTIVITI
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4.1.1.3 INFILTRATION TRENCHAlternat
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• Consult the NRCS Tahoe Basin So
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• Alternative Method: Excavate th
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Figure 4.1-c: Infiltration TrenchTR
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Figure 4.1-e: Roof Dripline Planter
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4.1.1.4 SUBSURFACE INFILTRATION SYS
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percent void space compared to 40 p
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• Ensure the surrounding surface
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4.1.1.5 RAIN BARREL AND CISTERNAlte
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• Position the rain barrel or cis
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4.1.1.6 RAIN GARDENAlternative Name
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• To manage high flows, design a
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4.1.1.7 FILTER STRIPAlternative Nam
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• The top of the vegetated filter
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INSPECTION AND MAINTENANCE ACTIVITI
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Figure 4.1-i: Vegetated Filter Stri
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LIST OF FIGURESFigure 4.2-a: Slope
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Chapter 4: BMP ToolkitTRPA BMP Hand
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• Obtain and use a road abrasive
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• Mechanical broom sweepers may a
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EFFECTIVENESS CONSIDERATIONSA signi
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for dry basins or infiltration basi
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• For unpaved snow storage areas
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Figure 4.2-a: Slope Stabilization A
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Disadvantages• Not always success
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• Bind together long live branch
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Brush Layering and MattingBrush lay
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Advantages• Reduces the erosion p
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Table 4.2-1: Terracing Inspection a
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Disadvantages• Can be complicated
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• Revegetate the backfilled bench
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Figure 4.2-d: Timber Retaining Wall
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Advantages• Versatile and applica
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Table 4.2-3: Riprap Inspection and
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educe the concentration of runoff,
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Figure 4.2-g: Slope Bottom BenchFig
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• Contour Furrows - relatively de
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APPLICABILITYAll roads, driveways,
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Stormwater runoff from a paved park
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Figure 4.2-k: Grading for Sheet Flo
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INORGANIC MULCH:• Areas where org
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• Stockpile and use existing orga
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The surface under the raised decksh
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Figure 4.2-l: Rock Armor - Elevated
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Clustered boulders used for parking
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• Helps to protect wildlife.• H
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EFFECTIVENESS CONSIDERATIONSA prope
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Improper storage of hazardous mater
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• Try to use the entire product b
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facilities must be equipped with ap
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Page 280 and 281: • Dispose of it properly• Be a
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Page 288 and 289: • Sanitary sewer regulations gene
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Page 294 and 295: LIST OF FIGURESFigure 4.3-a: Curb B
Page 298 and 299: APPLICABILITY• Culverts are appli
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Page 304 and 305: APPLICABILITY• Curb and gutters a
Page 306 and 307: INSTALLATION CONSIDERATIONS• Inst
Page 308 and 309: Figure 4.3-b: Rolled CurbChapter 4:
Page 310 and 311: Advantages• Prevents the discharg
Page 312 and 313: Table 4.3-2: Storm Drain Inspection
Page 314 and 315: Advantages• Prevents scour that m
Page 316 and 317: Figure 4.3-c: Outlet ProtectionChap
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Page 324 and 325: INSTALLATION CONSIDERATIONS• Disc
Page 330 and 331: Figure 4.3-e: Slotted Channel Drain
Page 332 and 333: Advantages• May be less expensive
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Page 348 and 349: Check dams installed in water sprea
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Page 352 and 353: CONTENTS4.4 Stormwater Treatment ..
Page 354 and 355: 4.4 STORMWATER TREATMENTThe primary
Page 356 and 357: 4.4.1.1 WET BASINAlternative Names:
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Page 362 and 363: Figure 4.4-a: Wet Basin (Concept Dr
Page 364 and 365: 4.4.1.2 BIOSWALEAlternative Names:
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Page 370 and 371: 4.4.1.3 DRY BASINAlternative Names:
Page 372 and 373: • Drainage design standards for t
Page 374 and 375: INSPECTION AND MAINTENANCE ACTIVITI
Page 376 and 377: Figure 4.4-c: Detention BasinTRPA B
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4.4.2 FLOW THROUGH TREATMENTFlow-th
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4.4.2.1 DROP INLET INSERTAlternativ
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INSTALLATION CONSIDERATIONS• Refe
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4.4.2.2 TRASH RACKAlternate Names:
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4.4.2.3 BAFFLED VAULTAlternative Na
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• Ensure that site conditions all
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4.4.2.4 HYDRODYNAMIC SEPARATORAlter
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• Most units are designed to be c
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4.4.2.5 MEDIA FILTERAlternate Names
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Cartridge Filter• Cartridge filte
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• Vent the system as for undergro
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4.4.2.6 SEDIMENT TRAPAlternative Na
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INSPECTION AND MAINTENANCE• Regul
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Figure 4.4-e: Sediment TrapTRPA BMP
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CONTENTS4.5 Temporary BMPs for Cons
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4.5 TEMPORARY BMPS FOR CONSTRUCTION
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concrete washouts and stockpiles sh
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4.5.1.1 CONSTRUCTION PLANNING AND S
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• Measures to minimize the potent
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4.5.1.2 CONSTRUCTION BOUNDARY FENCI
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Figure 4.5-a: Construction Boundary
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4.5.1.3 DEWATERINGDESCRIPTIONDewate
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Figure 4.5-b: DewateringTRPA BMP Ha
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• Use this settled water to fill
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4.5.1.4 CLEAN WATER DIVERSIONAltern
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• Avoid disturbing aquatic specie
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• Pipe slope drain: A rigid pipe,
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Stream Isolation Techniques:• Tur
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Figure 4.5-f: Water DiversionTRPA B
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4.5.1.5 VEGETATION PROTECTIONAltern
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• Growing Space: Provide spacing
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Figure 4.5-g: Vegetation Protection
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4.5.1.6 TEMPORARY SANITATION FACILI
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4.5.1.7 DUST CONTROLAlternate Names
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• Blanket with geotextiles or veg
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4.5.1.8 VEHICLE INGRESS EGRESS MANA
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• If possible, re-use swept or va
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4.5.1.9 WINTERIZATIONDESCRIPTIONBet
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INSPECTION AND MAINTENANCEEnsure th
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4.5.1.10 CONSTRUCTION STAGINGAltern
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4.5.1.11 MATERIAL HANDLING STORAGE
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• Ensure that current Material Sa
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4.5.1.12 TOPSOIL SALVAGEAlternative
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• If topsoil will not be used for
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4.5.1.13 CONCRETE/BENTONITE MANAGEM
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Figure 4.5-i: Concrete Washout Stat
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4.5.1.14 STOCKPILE MANAGEMENTAltern
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Figure 4.5-j: Stockpile ManagementT
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4.5.2 EROSION AND SEDIMENT CONTROLR
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4.5.2.1 SWEEPINGDESCRIPTIONDuring c
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4.5.2.2 DRAIN INLET PROTECTIONAlter
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inches. Take care to ensure that no
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Figure 4.5-k: Drain Inlet Protectio
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4.5.2.3 FIBER ROLLAlternative Names
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• Adjust spacing of fiber rolls a
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Figure 4.5-l: Fiber RollsTRPA BMP H
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4.5.2.4 SILT FENCEAlternative Names
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• Turn the fabric uphill at the e
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Figure 4.5-m: Silt FenceTRPA BMP Ha
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4.5.2.5 EROSION CONTROL BLANKET SYS
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structures mark the boundaries of t
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Figure 4.5-p: Anchoring Geotextiles
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4.5.2.6 HYDROMULCH, TACKIFIER, AND
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INSPECTION AND MAINTENANCE• Hydro
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5.2 SOILSoil is a complex living sy
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Tilling green wood chips intothe so
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areas such as SEZs and in shorezone
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Large boulders provide permanent ve
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To address this TRPA’s Regional P
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to apply ½ inch of water. Water yo
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Pesticides can be degraded by sunli
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5.3.2.5 FIRE DEFENSIBLE SPACEFire d
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etween them. For example, shrubs wi
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5.4 PROJECT SCALE REQUIREMENTSSoil
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5.4.1.5 PROJECT INSTALLATIONA. CONT
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percent vegetative cover, soil surf
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TRPA Revegetation Plan TemplateSoil
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(c) GRADING AND SLOPE SHAPINGDescri
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TRPA Revegetation Plan ExampleSoil
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• All machinery must be clean bef
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Common NameScientific NameScotchbro
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during dry weather. All debris, roo
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substantially different that the pe
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TRPA BMP HandbookCHAPTER 5: Soil an
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Fertilizer Management PlanProject N
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IV. MONITORINGSurface and groundwat
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I. PROJECT AND SITE DESCRIPTIONGold
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Table 5-1: Description of Revegetat
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SITE TYPE RECOMMENDED SPECIES LISTS
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SITE TYPE RECOMMENDED SPECIES LISTW
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CHAPTER 5: Soil and Vegetation Mana
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TRPA APPROVED PLANT SPECIES ATTRIBU
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TRPA APPROVED PLANT SPECIES ATTRIBU
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CHAPTER 5: Soil and Vegetation Mana
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• Section 6.2 describes methods f
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equirements. At a minimum, training
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Vactor equipment removes sediment a
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Industrial Properties, Marinas, and
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• Rinse the rock with hose water
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EXAMPLE INSPECTION AND MAINTENANCE
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MONITORING PLAN TEMPLATE1. TITLE PA
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MONITORING, INSPECTION, ANDMAINTENA
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Sample Site123 Main StreetSouth Lak
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3. MONITORINGIn 2011, South Lake Ta
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ATTACHMENT BWATER QUALITY DATA
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ATTACHMENT DINSPECTION AND MAINTENC
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• Discharge of stormwater from in
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PAVING SINGLE FAMILY RESIDENTIAL PR
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TRPA Shorezone permit (www.trpa.org
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CHAPTER 8: SHOREZONE PROTECTIVESTRU
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technical guidance on structural an
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Pope has developed a shorezone miti
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ADVANTAGES• Protect parcel develo
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Table 8-3: Categorical Classificati
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generate observable changes in the
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Table 8-5: The General Geomorphic C
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8.1.8.2 TOLERANCE DISTRICT AND BACK
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Figure 8-e: Option 2—Backshore De
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Scenic Resources and project compli
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8.2 BULKHEADS AND LAKE WALLS8.2.1 O
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oth the beach immediately fronting
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Like all BMPs, bulkheads and lake w
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For a bulkhead located such that th
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Figure 8-i: Typical Lake Wall (Grav
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Table 8-9: Advantages and Disadvant
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maintains its position under wave s
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8.3.4 INSTALLATIONAs with bulkheads
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Table 8-11: Advantages and Disadvan
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V t ≥ 5R c2(Equation 4.1)Where:Vt
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8.5 BEACH NOURISHMENT AND REPLENISH
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of not being able to protect the ba
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• The material must be washed to
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nourishment will be determined by m
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8.7 BREAKWATERS8.7.1 OVERVIEWBreakw
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The procedure for determining armor
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8.8 SHOREZONE VEGETATION8.8.1 OVERV
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vegetation. Protecting a tree from
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Overall, dredging can be either a p
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The Pneuma pump is a piece of dredg
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nature of the project and the poten
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8.10 TURBIDITY CURTAINS8.10.1 OVERV
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weights or connected firmly to sand
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Figure 8-o: Turbidity Curtain Desig
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Aquatic invasive species (AIS) also
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tanks into a sewage retention and/o
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• A common problem with recreatio
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8.12 BOAT RAMP CONSTRUCTION AND VEH
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amp at the change of grade. A V-gro
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Figure 8-p: Boat Ramp DesignTRPA BM
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Table 8-22: Overview of Geotechnica
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8.14 SHOREZONE PROTECTIVE STRUCTURE
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8.14.2 ADDITIONAL CONSIDERATIONS FO
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some designated boundary or sphere
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spawning grounds and juvenile nurse
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Marine Science, School of Geoscienc
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Osborne, R.H., et. Al. (1985). Sedi
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8.16 APPENDICES8.16.1 DESIGN CALCUL
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Figure 8-r defines the primary wave
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8.16.1.2 WAVE RUN-UP FORMULA FOR BA
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• Use Equation 16.10 to calculate
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Figure 8-u: Design Wave CasesTRPA B
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Figure 8-v: Wave Setup and Run-Up f
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Alternative methods of wave calcula
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GLOSSARYAccretionMay be either a na
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eaches have no berm, others have se
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DensityMass (in kg) per unit of vol
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Fire Defensible SpaceRefers to the
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Common terms related to land covera
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PermeabilityThe property of a bulk
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ScourRemoval of underwater material
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SlopeThe degree of inclination to t
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Technical Advisory Committee (TAC)C
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ACRONYMSACES - Automated Coastal En
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NPS - Nonpoint SourceNRCS - Natural
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BEsT MANAGEMENT PRACTICEs HANDbooK - Tahoe BMP

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