Maroondah City Council Engineering Development Design .
Maroondah City CouncilEngineering DevelopmentDesign Guidelines
Document control2Revision NumberDate AdoptedChangesAJuly 2016NILMaroondah City Council Engineering Development Design Guidelines
ContentsFigures5Tables6Purpose7Scope7Guideline Objectives7Engineering Development Objectives & Strategic Considerations8Maroondah Planning Scheme Objectives8Maroondah 2040 & Other Key Strategies8Planning Permit Condition Objectives10Engineering plans design process11Drainage connection to legal point of discharge (LPD)12Drainage connections to Melbourne Water assets12Drainage connections to Council assets12CCTV report requirements15Calculating permissible site discharge (PSD)16Rational method16Onsite detention18Onsite detention volume requirements18Onsite detention and PSD distribution20Treatment of uncontrolled runoff20Design requirements for detention systems21Onsite detention for basement car parks23Onsite detention additional considerations23Orifice size computations method24Pipe design criteria25Minimum pipe capacities for new Council drains25Pipe cover and backfill and preferred material for private drains25Pipe cover and backfill and preferred material for Council drains26Minimum pipe grades26Minimum velocities26Maximum velocities26Pit design criteria27Private pits27Council junction pits27Trench grates27Treatment of 100 year storm event within the development28Maroondah City Council Engineering Development Design Guidelines3
External overland flow and land subject to floodingBuilding on land liable to overland flow30Building on land liable to flooding33Building over an easementPrivate drains in easementsCalculating pipe or open channel capacity343435Pipe Flow35Channel Flow35Erosion and Sediment Control36Why is erosion and sediment control important?36When do erosion and sediment controls need to be in place?36Minimum required erosion and sediment controls36Water Sensitive Urban Design (WSUD)37Achieving best practice runoff requirements for development only (no subdivision)37Achieving best practice runoff requirements for residential subdivision37Provision of WSUD elements to achieve best practice37Rainwater Tanks38Payment of levies to Melbourne Water in lieu of achieving best practice38Driveway construction39Dimensions of driveways39Levels and grades of driveways39Driveway pavement composition40Low impact paving40Vehicle crossing details40Car park signage and linemarking41Required notes on paving and drainage plans42Lodging of paving and drainage plans to Council for approval43Payment of plan checking fee43Paving and drainage plans size and format43Construction works42944Road/asset opening permit44Vehicle crossing permit44Traffic management / Road and footpath closure permits44Inspection of completed works45Engineering Development Design Checklist46Maroondah City Council Engineering Development Design Guidelines
FiguresFigure 1Water Sensitive City Strategy Outcomes9Figure 2Flowchart of typical engineering plan design process11Figure 3Typical pipe to pipe connection12Figure 4Creation of a new pit over an existing drain13Figure 5Full height kerb adaptor13Figure 6Typical creek or table drain connection13Figure 7Typical drainage trench pipe bedding14Figure 8New pipe and pit construction14Figure 9Inspection of new pit formwork14Figure 10Extract from a CCTV report15Figure 11Formal trash grate21Figure 12Typical rainwater tank design22Figure 13Typical tank slow release orifice22Figure 14Typical bike safe trench grate27Figure 15Typical overland flow paths30Figure 16Development impact on overland flow path30Figure 17Freeboard above flood level32Figure 18Typical silt fence installation36Figure 19Typical erosion control details36Figure 20WSUD rain garden concept37Figure 21Typical MUSIC model38Figure 22STORM calculator38Figure 23Rainwater tank used for re-use38Figure 24Typical driveway pavement detail39Figure 25Driveway construction40Figure 26An example of low impact pervious pavement40Figure 27Sample vehicle crossing40Maroondah City Council Engineering Development Design Guidelines5
Tables6Table 1Runoff coefficient for vacant land based upon lot size16Table 2Time of Concentration based upon lot size17Table 3Rainfall intensities to be used within Maroondah17Table 4Detention requirements18Table 5Worked example of onsite detention distribution20Table 6Minimum grades for detention pipes21Table 7Worked example of orifice size calculation24Table 8Minimum pipe capacities for new Council drains25Table 9Pipe cover and backfill and preferred material for private drains25Table 10Pipe cover and backfill and preferred material for Council drains26Table 11Minimum pit sizes to (AS3500.3:2015 7.5.2.1)27Table 12Minimum Council junction pit size27Table 13Requirements for developing on overland flow paths31Table 14Typical freeboard requirements32Maroondah City Council Engineering Development Design Guidelines
PurposeThe purpose of the guidelines is to providetechnical guidance and direction to Developersand Engineering Consultants for the preparation ofpaving and drainage plans to satisfy TownPlanning Permit conditions for multi dwellingdevelopments and subdivisions.The aim of the guidelines is to ensure thatCouncil’s technical requirements for preparingpaving and drainage plans are understood at theoutset by Developers and Engineering Consultantsso that the paving and drainage plans can beprepared and endorsed efficiently without unduedelay.Furthermore, in accordance with Maroondah’s2040 Community Vision, the requirements andprinciples set out in the guidelines aims to ensurethat development within the City of Maroondah isattractive thriving and well built both now and intothe future.ScopeThe guidelines apply to the Statutory Planningprocess for multi dwelling developments andsubdivisions within Maroondah City Council tocomply with the principles and requirements of theMaroondah Planning Scheme, Planning andEnvironment Act 1987, Subdivision Act 1988, LocalGovernment Act 1989, Water Act 1989 andMaroondah Local Laws.GuidelineobjectivesThe objectives of the guidelines are to: Ensure that development within Maroondahmeets the statutory requirements of theMaroondah Planning Scheme and relevant Acts. Ensure that there is no negative impact onCouncil infrastructure as a result ofdevelopment. Ensure that any new Council infrastructure isdesigned and constructed in accordance withMaroondah City Council’s standards andindustry best practice. Ensure that any new private infrastructure isdesigned and constructed to the relevantindustry standards and in a way that does notcreate future problems for property owners,adjoining properties or the public, whilstallowing consideration for innovative andsustainable design approaches and newtechnologies. Provide high level advice back to engineers anddevelopers, including clear and conciseconditions when approval is granted andtangible and clear direction if amendments arerequired. Allow consultants/developers to expectappropriate consideration of paving anddrainage plans that is fair and consistent.The guidelines also provides direction for buildingworks that may have an impact on Councilinfrastructure or may be subject to variousinfrastructure related regulations prescribed underthe Building Regulations 2006.Maroondah City Council Engineering Development Design Guidelines7
Engineering development objectivesand strategic considerationsWhen considering a planning permit for adevelopment and/or subdivision, the objectivesapplied and conditions imposed emanate from theMaroondah Planning Scheme and the Maroondah2040 Community Vision and other key Councilstrategies. Consideration is also given to thePlanning and Environment Act 1987, SubdivisionAct 1988, Local Government Act 1989, Water Act1989 and Maroondah City Council Local Laws.Maroondah Planning SchemeObjectivesClauses 55.02 & 56.07 of the Maroondah PlanningScheme outline the following objectives:Maroondah 2040 and other keystrategiesMaroondah 2040The Maroondah 2040 Community vision is In2040, Maroondah will be a vibrant and diverse citywith a healthy and active community, living ingreen leafy neighbourhoods which are connectedto thriving and accessible activity centrescontributing to a prosperous economy within asafe, inclusive and sustainable environment.The key directions of Maroondah 2040 that relateto the Engineering Development Design Guidelinesinclude: Advocate for increased stormwater harvestingand greywater re-use by households andbusinesses. Work in partnership to improve walkabilitywithin and between neighbourhoods andactivity centres through effective urban design,open space planning, wayfinding signage,improved public lighting and accessibleinfrastructure. To ensure that the street operates adequatelyduring major storm events and provides forpublic safety.Encourage high quality urban design thatprovides for a healthy, attractive and desirablebuilt form. To minimise increases in stormwater run-offand protect the environmental values andphysical characteristics of receiving watersfrom degradation by urban run-off.Work in partnership to ensure developmentconsiders urban design principles that enhancethe connection between the built environmentand the natural environment. Facilitate, lead and educate the community inthe use of environmentally sustainable designacross all forms of infrastructure to limit carbonemissions and reduce resource consumption. Work in partnership to encourage the use of awater sensitive approach in the developmentand renewal of the built and naturalenvironment. Ensure the management of infrastructure andprioritisation of capital works considersdemographic change, the impacts of climatechange, and accessibility for all ages andabilities. To ensure development is provided withappropriate utility services and infrastructure. To ensure development does not unreasonablyoverload the capacity of utility services andinfrastructure. To provide for the substitution of drinkingwater for non-drinking purposes with re-usedand recycled water. To minimise damage to properties andinconvenience to residents from urban run-off. Further information regarding the planningschemes objectives and requirements are chemes/vpps/55 es/vpps/56 07.pdf8Maroondah City Council Engineering Development Design Guidelines
Work in partnership with other catchmentauthorities to ensure effective stormwatermanagement across Maroondah, including theidentification and implementation ofappropriate strategies that increase the storage,re-use and re-direction of stormwater andprovide flood mitigation for the community.Provide enhanced governance that istransparent, accessible, inclusive andaccountable.Further information regarding the Maroondah2040 community vision can be found on /Maroondah2040.aspxMaroondah Water Sensitive City StrategyMaroondah’s Water Sensitive City Strategy visionis By 2040, Maroondah will be a water sensitivecity. Positioned at the top of several creekcatchments, Maroondah’s waterways will be clean,ecologically rich, and beautiful recreationalcorridors that define the character of Maroondah.Our residents, workers and visitors will treasurewater as a valued resource and enjoy green leafyneighbourhoods and high quality open spaces thatare supported by sustainable water sources.Maroondah will have good water security and beresilient to drought and flood. Our homes andother buildings will demonstrate good practice inwater management and will benefit from welldesigned streets and green corridors where floodwaters are conveyed safely. In partnership withgovernment, community and relevant authorities,Council will actively seek opportunities to deliverenvironmental, community and economic benefitthrough continual improvement of the local watercycle using an integrated approach.The key Water Sensitive City Strategy outcomesare:HealthyenvironmentsWater valuedby allCollaborativecultureResilientplaces Healthy waterways Responsible use byCouncil, residentsand businesses Integratedapproach Flood resilient Green spaces Trees and amenity Recreation Fit for purposewater sources Reducedstormwaterpollution Reducedwastewaterpollution Seeking multiplebenefits Working withpartners Drought resilient Cool microclimate Good urban design Engagedcommunities andbusinessesFigure 1 - Water Sensitive City Strategy OutcomesMaroondah City Council Engineering Development Design Guidelines9
Maroondah Housing StrategyMaroondah City Council has developed a newhousing strategy which establishes future policydirections and will guide future residentialdevelopment. The Maroondah Housing Strategyhas been developed to ensure that themunicipality will meet its housing requirementsover the coming decades.The Maroondah Engineering Development DesignGuidelines and this Housing Strategy will assistcouncil to continue to maintain and enhance thelivability of our community. The strategy willidentify future growth areas and will ensure thatessential services such as drainage will be suitablefor the proposed level of development.Planning permit conditionobjectivesTypical planning permit conditions that respond tothe above objectives and in consideration of theabovementioned acts could include but are notlimited to requirements to: Prepare drainage plans to connect thedevelopment to an appropriate legal point ofdischarge and to ensure that the developmentdoes not negatively impact Council’s orMelbourne Waters drainage infrastructure. Prepare paving plans to demonstrate correctdrainage function and to demonstrate thatappropriate access and egress can be achievedto all proposed dwellings. Ensure that access and egress can be achievedto all proposed properties via the constructionof vehicle crossings that meet Council’sstandards. Ensure that the development is protected fromflooding and neighbouring properties are notadversely affected. Undertake the required works in accordancewith the endorsed paving and drainage plans. Ensure that during construction appropriatemeasures are implemented to control pollutantsfrom the site.Maroondah Open Space StrategyMaroondah City Council has developed an openspace strategy to guide its planning, developmentand management of open spaces within themunicipality. The open space strategy will identifyopportunities for strategic land acquisitions anddevelopment opportunities which would improvethe accessibility, connectivity and functionality ofMaroondah’s open spaces while givingconsideration to strategic drainage improvements.10Maroondah City Council Engineering Development Design Guidelines
10Engineering plans design processEngineering plans design processThe following simple flow chart identifies a typical engineering plans design process that should beconsidered and followed.The following simple flow chart identifies a typical engineering plans design process that should beconsidered and followed.Obtain LPD & propertydevelopmentinformationObtain town planningpermit & review specificconditionsCalculate PSD usingrational methodComplete paving &drainage designDesign detention systemCalculate detentionvolumeCheck provision for 100year event for thedevelopmentComplete engineeringdevelopment designchecklistPay engineering planchecking feeSubmission of plans,computations andrelated documentationFigure 2 - Flowchart of typical engineering plan design processFigure 2 - Flowchart of typical engineering plan design processJune, 2016Engineering Development Design GuidelinesMaroondah City Council Engineering Development Design Guidelines1211
Drainage connection to legal point ofdischarge (LPD)A Legal Point of Discharge (LPD) is the pointwhich is specified by Council where thestormwater leaves an individual property, and mayinclude connection to: a Council underground stormwater pipe or pitwithin Council land, an easement, or within roadreserve kerb and channel (with an approved kerbadaptor) a table (open/swale) drain a Melbourne Water major drain, subject toMelbourne Water conditions.Drainage connections to CouncilassetsConnections directly to a Council pipeConnection can be made directly to a Councilstormwater pipe where Council’s pipe diameter isthree times larger than the incoming pipe. Forexample a 100mm inlet pipe can only connect to a300mm diameter or larger pipe. The connectionmust be made via an approved saddle adaptor inaccordance with Council’s Engineering StandardDrawing: SD-E01 or SD-E01AA LPD statement is provided in accordance withsection 62 of Maroondah City Council’s Local LawNo. 11 and section 610 of the Building Regulations2006. To apply for a LPD, please refer to Council’swebsite for the application process or for /LegalPointOfDischarge.aspxPlease note: A copy of the LPD should be providedto Council with the paving and drainage plans.Drainage connections toMelbourne Water assetsWhere connection is to be made directly to aMelbourne Water pipe drain or open waterwayapproval must be sort directly from MelbourneWater including their requirements for connection.Council cannot approve the drainage design planuntil Melbourne Water approval is obtained and acopy of the approval is provided to Council.Refer to Melbourne Water website for /Connecting-to-stormwater-drains.aspx12Figure 3 - Typical pipe to pipe connectionConnections to an existing Council pitConnection can be made to an existing Councilstormwater pit in accordance with Council’sEngineering Standard Drawing SD-E02, if theexisting pit is greater than 600x900mm indimension and in good condition. If the existing pitis less than 600x900mm or in poor condition, itmust be reconstructed to Council’s satisfaction.Maroondah City Council Engineering Development Design Guidelines
Connections to a new Council pitConnection to a table (open/swale) drainConnection can be made by constructing a newCouncil stormwater pit over an existing Councildrainage pipe. The construction of a new Councilpit must be in accordance with CouncilsEngineering Standard Drawing: SD-D06.Connection can be made to an existing Counciltable (open/swale) drain however rock beachingmust be constructed to the invert to preventscouring, to Council’s satisfaction.Figure 6 - Typical creek or table drain connectionConnection to existing drainage within apropertyFigure 4 - Creation of a new pit over an existingdrainConnections to kerb and channelConnection can be made to the kerb and channelusing a full height kerb adaptor; however it mustbe located directly in front of the property, unlessotherwise directed by Council. Consideration mustbe given to the overall drainage design to ensurethat there is appropriate fall to the kerb andchannel so that no pipes or pits hold water. If thiscannot be reasonably obtained a new outfall drainmay be required to be constructed within the roadreserve or easement.Connection to kerb and channel are not to bemade within a vehicle crossing and are to be madeto Council’s satisfaction.Connection can be made to a properties existingLPD connection within the property, however adrainage report, including CCTV footage and report,must be provided from a suitably qualified plumberto verify that the existing stormwater drainage isconnected to an appropriate Council asset and is ingood serviceable condition to Council’s satisfaction.Refer to page 15 for details of CCTV requirements.It is suggested to install an inspection opening(I.O.) at the connection of the new to the existingstormwater pipes.Connection to existing private drainagewithin an easementIf a Council asset is not within a reasonabledistance from a property and an existing privatedrain is located within an easement, connectionmay be made to the existing private drain withinthe easement subject to Council’s approval andthe following conditions: A drainage report, including CCTV footage inaccordance with the Water ServicesAssociation of Australia (WSA) 05-2008 2.2Code of practice, must be provided from asuitably qualified plumber to verify that theexisting private stormwater drain is connectedto an appropriate Council asset and is in goodserviceable condition, to Council’s satisfaction. Any identified defects within the private drainmust be rectified to Council’s satisfaction. 100 year ARI detention storage must beprovided within the property to preventflooding into neighbouring properties.Refer to page 15 for details of CCTV requirements.Figure 5 - Full height kerb adaptorMaroondah City Council Engineering Development Design Guidelines13
Construction of a new outfall drainIn the absence of an appropriate LPD beingavailable, the construction of a new outfall drainwithin an easement or road reserve may berequired.Council has a number of mandatory requirementsfor constructing a new Council stormwater asset,including: Preparation and submission of a drainagedesign plan to Council’s satisfaction Payment of plan checking and supervision feesand lodgement of a works maintenance bond Hold point inspections CCTV footage and report, and As constructed plans.In accordance with the Subdivision Act, theconstruction of assets that become Council’sresponsibility incur a plan checking fee of 0.75%of the value of the works and a supervision fee of2.5% of the value of the works. An estimate ofcosts for the drainage works will need to besubmitted so that Council fees can be calculated inaccordance with the Act. Please note that thesefees are in addition to the standard engineeringplan checking fees.Figure 7 - Typical drainage trench pipe beddingFigure 8 - New pipe and pit constructionFurthermore, in accordance with the SubdivisionAct, a three month defects liability period appliesto the easement drainage works. Council requiresthe lodgement of a works maintenance bond tothe value of 5% of the actual cost of the drainageworks. The works maintenance bond will bereturned to the payee at the end of the defectsliability period provided that the works have beenmaintained and all defects are rectified to thesatisfaction of Council.During construction of a new Council drain,Council is required to inspect the works at varioushold points including:14 Prepared drainage pipe bedding Prepared bedding for drainage pits Formwork and reinforcement (if required) fordrainage pit walls Connection of existing or new subsoil (aggie)drainage into new stormwater pit (for worksbehind kerb and channel) Compacted drainage pipe haunching Compacted drainage backfill.Figure 9 - Inspection of new pit formworkOnce construction is completed and prior to thecommencement of the defects liability period,CCTV footage and report for all new Councildrainage lines is to be provided to Council’ssatisfaction and in accordance with the WaterServices Association of Australia (WSA) 05-20082.2 Code of practice. Refer to section 12 below fordetails of CCTV requirements.Furthermore, prior to the return of the worksmaintenance bond, as constructed engineeringplans showing the location, type, depth anddimensions of the new Council stormwater drainsand pits must be provided to Council’s satisfaction.Maroondah City Council Engineering Development Design Guidelines
CCTV report requirementsMaroondah City Council requires CCTVinvestigation to be undertaken when any newCouncil drainage asset is constructed, after repairsor renewal of stormwater pipes, wheninvestigating the condition or capacity of existingstormwater assets or pre and post works where adevelopment could damage a Council drainageasset.The CCTV report must provide the followinginformation:The CCTV investigation must include CCTVfootage and a report in accordance with the WaterServices Association of Australia (WSA) 05-20082.2 Code of practice.Note: Push rod camera footage does not meetthe WSA code of practice and will not beaccepted. Date of CCTV investigation Pipe location Pipe length Pipe diameter Pipe type Every joint and pipe connection must be fullyreviewed by the camera Coding of defects in accordance with the WSAcode of practice.The CCTV footage must be separate files for eachpipe length, so Council can allocate the footageagainst the particular asset. An annotated plan ormap must accompany the report to show thecorresponding sections of CCTV.Figure 10 - Extract from a CCTV reportThe CCTV report must be submitted to and reviewed by Council’s Engineering Department. If the reportidentifies unsatisfactory quality of work or defects within the drainage assets, rectification of the issuesmust be undertaken to Council’s satisfaction.Maroondah City Council Engineering Development Design Guidelines15
Calculating permissible site discharge(PSD)The permissible site discharge (PSD) is the peakflow rate allowed to be discharged from aproperty to the nominated legal point ofdischarge, and must be limited to a 5 year ARIflow rate.In general, most Planning Permits will require thefollowing:Limit the Permissible Site Discharge (PSD) to theequivalent of a 35% impervious site coverage, orthe pre-developed discharge rate, if it is less than35% impervious site coverage, to the satisfaction ofthe Responsible AuthorityCouncil’s definition of “impervious site coverage”includes all hard surface areas where water is likelyto run off rather that infiltrate into the ground. Thisincludes but is not necessarily limited to alldwellings, garages, sheds, driveways, paved areas& paths etc.The rational method shall be adopted to calculatethe PSD.Rational methodThe rational method is generally used to calculatedesign peak flow rates, and the PSD.The peak flow rate resulting from a storm with anaverage recurrence interval (ARI) of Y (years) iscalculated using the following formula:(C) - Runoff CoefficientRun off coefficients must make allowances for thevarying percentages and mixing of pervious andimpervious surfaces.Calculating the ‘C’ value for pre-developed flowsassuming 35% site coverage:C 0.510.9 x 35% Area 0.3 x 65% AreaAreaIf the pre-developed site coverage is less than 35%then this lesser value should be used as the ‘C’value for pre-developed.Example: Calculating the ‘C’ value for predeveloped flows with 25% site coverage:C 0.450.9 x 25% Area 0.3 x 75% AreaAreaValues given in table below are to be used tocalculate the post development flow rates fordevelopments where the extent of building workshas not yet been determined under the PlanningPermit. (i.e. vacant land subdivisions). The valuesare to be used:Land UseMajor open spaceC (5C (100Year ARI) Year ARI)0.300.40Residential (average lot size): 4000m20.400.50 750m20.600.75 500m20.700.852 350m0.801.0 350m20.901.0C runoff coefficient for design event having anARI of Y (years).High Density UnitDevelopments0.901.0IMajor Road Reserves0.801.0Commercial/Industrial0.901.0Q CIA360Where the parameters are:Q peak flow rate resulting from ARI of y(years) in (m3/s) rainfall intensity (mm/hr) corresponding to aparticular storm duration and ARI.A area of catchment in hectares.Table 1 - R unoff coefficient for vacant land basedupon lot size16Maroondah City Council Engineering Development Design Guidelines
(I) - Rainfall Intensity(A) - Area of CatchmentTo determine the intensity (I), use the time ofconcentration table below to choose anappropriate TC (mins) relative to the predeveloped lot size and match the figure to the ARItable for the required storm event.Area (hectares) to include total lot size, includingall pervious and impervious areas.Land Use (Average Lot Size)TC (mins) 4000m212 750m29 500m28 350m27 350m26High Density Unit Developments5Table 2 - Time of Concentration based upon lotsizeWorked example: rational method todetermine PSDA typical 2 unit site of area 865m2 assuming 35%site coverage:CIAFormula: Q 360Where: C 0.51I 68.292 mm/hrA 0.0865 hectaresQ (0.51 x 68.292 x 0.0865) / 360 0.00837 m3/s or 8.37 l/sARI (mm/hr)DurationTC (mins)5 Year10 Year 20 Year 100 Year5 Mins86.771102.892124.309180.8576 Mins80.89895.801115.610167.8207 Mins76.02289.922108.405157.0478 Mins71.87884.930102.294147.9259 Mins68.29280.61597.016140.06110 Mins65.14676.83392.393133.18512 Mins62.35573.48084.638127.10320 Mins46.27054.21964.83892.43830 Mins36.99243.16551.43172.7961 Hour24.43928.29533.48746.768Table 3 - Rainfall intensities to be used withinMaroondah(Raw Data: 19.01, 4.32, 1.32, 37.95, 7.58, 2.41,skew 0.35, F2 4.28, F50 15) April 2013Maroondah City Council Engineering Development Design Guidelines17
Onsite detentionThe planning permit conditions will generally detail if the development requires onsite detention storage.A typical planning permit condition would require the following:‘Limit the Permissible Site Discharge (PSD) to the equivalent of a 35% impervious site coverage, or thepre-developed discharge rate, if it is less than 35% impervious site coverage, to the satisfaction of theResponsible Authority’, and‘Provide appropriate stormwater detention storage to limit the maximum discharge rate to the PSD’.Onsite detention volume requirementsAll developments that require onsite detention must detain a minimum of 1 in 10 year storm event;however there may be cases where a property is required to store a 1 in 20 year or 1 in 100 year stormevent. The following table outlines the detention requirements for various property situations:Slope of property & LPDlocationTreatment of overland flow path (Q100from site)Detention requirements( 1 in x storm event)Forward or side sloping withLPD in road reserveA safe overland flow path can be providedto the road reserve without detrimentallyaffecting other properties10 yearForward or side sloping withLPD in road reserveNo safe overland flow path can beprovided to the road reserve withoutdetrimentally affecting other properties100 yearRear or side sloping with LPDin r
Driveway construction 39 Dimensions of driveways 39 Levels and grades of driveways 39 Driveway pavement composition 40 Low impact paving 40 . to the Engineering Development Design Guidelines include: Advocate for increased stormwater harvesting and greywater re-use by households and businesses.
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