Part I - Other Considerations - Richmond Valley Council

11.07.2015 Views
Richmond Valley Development Control Plan 2012(2) Treatment TrainThe “Treatment Train” is a concept for stormwater quality treatment describedin the NSW EPA Managing Urban Stormwater Series.To gain optimum stormwater quality outcomes it is desirable to combine 2 ormore Stormwater Quality Devices or management approaches. Thiscombination of treatment devices forms a stormwater treatment “train.” TheTreatment Train consists of:‣ Primary Level Treatment – screening of gross pollutants, sedimentationof coarse particles.‣ Secondary Level Treatment – Sedimentation of finer particles, filtration.‣ Tertiary Level Treatment – enhanced sedimentation and drainage,biological uptake, adsorption onto sediments.I9.3 WSUD PrinciplesFigures I9.1 & I9.2 provide diagrammatic examples of common WSUDfeatures utilising a source control approach. Figures I9.3 & I9.4 providediagrammatic examples for WSUD approaches for larger subdivision andneighbourhood scale developments.(1) WSUD Road Design and Lot Layout PrinciplesPrinciples of WSUD road design and layout are:‣ The design should promote the retention of the existing land form. Cutand fill is to be avoided and minimised where possible.‣ The design and layout should retain water courses.‣ The design should minimise stormwater runoff and peaks by avoidingthe channelling and concentration of flow and making use of existing sitetopography, natural drainage lines, soils and vegetation to treat, detain,retain and infiltrate stormwater.‣ Street layout should be designed to fit the topography so as to avoid therequirements for cut and fill.‣ Streets are not to be constructed within natural drainage lines.‣ Street design and layout should take into account native vegetation.‣ The street layout should avoid extended street lengths runningperpendicular to the slope so as to reduce runoff velocities.‣ Carriageway widths should be designed to minimise the amount ofimpermeable area but recognising that there will be a demand for whichmust be addressed either within the properties or on street.‣ Street design is to take into account the cleansing of stormwater throughthe use of landscaping, grass swales, filter strips, infiltration pits andoil/grit separators.‣ The design of the road cross section is to take into account the majorstormwater runoff events whilst allowing for vehicle safety.‣ The piped drainage scheme should take into account possibledecreased flows, where the decreases to the design events can bePart I – Other Considerations – Water Sensitive Urban Design I.90

Richmond Valley Development Control Plan 2012demonstrated through modelling or other to Council’s satisfaction, as aresult of the adoption of “sustainable water” measures within individuallots onsite.(2) WSUD Drainage Principles‣ The trunk drainage design should be based on a system of naturalwatercourses and floodplains where applicable designed to mimicnatural conditions and in particular natural flows as far as possible and tominimise maintenance.‣ These waterway corridors form the spine for the open space and habitatcorridor system.‣ The drainage system should incorporate multiple objective open spaceuses where possible.‣ The width of the habitat corridors should be based on:• the width required for flood event management.• the width required for habitat connectivity.• the width required for buffer areas.• the width required under policy.‣ The natural alignment and profile of the watercourse/s is to be retainedwhere possible.‣ Water and stormwater quality improvement devices such as detentionponds, constructed wetlands, gross pollutant traps, litter traps, sedimentponds should be placed off line to maintain the physical integrity andaesthetics of the creek system.‣ Open space planning around the trunk drainage system is to incorporatepublic safety with flood criteria.‣ Indigenous vegetation should be retained and rehabilitated.‣ The primary transport system should be an existing natural or designednatural style channel. Concrete channels and pipelines are to be avoidedwhere possible.‣ Trunk drainage may account for reductions in certain storm events andpollutant transfer as a result of initiatives to reduce and treat stormwaterat the lot level and through street design and layout but must allow forpossible failure of the local upstream attenuation systems.‣ Stormwater outlets and discharge into bushland areas are to be fittedwith energy dissipation devices and protection so as to prevent scourand erosion.‣ Where existing natural watercourses are being used to conveystormwater from a development, particular attention must be given to thelow flow situation to maintain the existing moisture levels that the floraand fauna are accustomed to and dependant upon.Part I – Other Considerations – Water Sensitive Urban Design I.91

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Part I - Other Considerations - Richmond Valley Council Part I - Other Considerations - Richmond Valley Council