Part I - Other Considerations - Richmond Valley Council

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Richmond Valley Development Control Plan 2012‣ Increases in erosion as a result of peaks, velocities and increases in thenumber of bank full events.‣ Increases in nuisance flooding, flash flooding, property damage and riskto public safety.‣ Increase contaminant loading due to increased runoff volumes andreplacement of vegetated filters with concrete systems.‣ Aquatic biodiversity decline as communities become disrupted as aresult of frequent and elevated stormwater pulse events.‣ Increased demand for drainage infrastructure and treatment devices.(2) ObjectivesThe objectives of element are to:‣ To maintain the sites mean stormwater volumes, peak flow rates, andrunoff event frequency as near as reasonable to sites originalcharacteristics.‣ To reduce flooding, property damage, and risk to public safety todownstream areas as a result of increased impermeability, increaserunoff volume and changes to drainage line upstream.‣ To protect receiving environments from the impacts of changes tostormwater characteristics.(3) Performance TargetsPerformance requirements for stormwater volumes and drainage are providedin Table I9.3Table I9.3 Stormwater TargetsElementPeak flowrates (m3/s)Mean annual stormwater postdevelopment volumes (ML/yr).TargetThe following targets apply:‣ Flowrates at any point are not to increaseduring storms for the 2 and 5 year ARIevent; or‣ As specified within specific drainage subcatchment policy recognised by Council; or‣ As specified within Council standards.The following targets apply‣ Mean annual stormwater volumes reducedby at least 10 % from baseline; or‣ As specified within specific drainage subcatchment policy recognised by Council; or‣ As specified within Council standards.(4) Variations to TargetsCouncil may vary those targets from above where:‣ Environmental or infrastructure factors require alternate performancetargets; or‣ A Masterplan, Integrated Urban Water Management Plan, StormwaterManagement Plan, Estuary Management Plan, Threatened SpeciesPart I – Other Considerations – Water Sensitive Urban Design I.100
Richmond Valley Development Control Plan 2012Recovery Plan or other council, State or Federal policy document hasidentified alternate performance targets.(5) Policy RequirementsThe following measures are required to be implemented to meet thePerformance Targets and Objectives of this policy.(a) All Applicable Development‣ The Targets, as specified in I9.3, must be met for all applicabledevelopment covered by this policy.‣ All measures are required to be implemented and certified prior to theissuing of a final occupancy certificate or Subdivision certificate (asapplicable).‣ The selection, installation and location treatment devices must take intoaccount the ability to access, maintain and inspect the device in itsoperational condition by the householder, site owner and/or regulatoryauthorities as applicable.‣ All treatment measures are to be designed, installed and maintained inaccordance with Council, or relevant authority, requirements.(i) Restrictions of treatment measures in certain instances.‣ Council may specify alternate requirements, alternate performancetargets, exclude or specify treatment measures where:• Physical site conditions in a development area such as soilpermeability, slope, soil types and groundwater limit the optionsavailable.• Environmental or infrastructure factors in a development arearequire an alternate standard of performance to that listed in thispolicy.• A Masterplan, Integrated Urban Water Management Plan,Stormwater Management Plan, Water Efficiency Plan, EstuaryManagement Plan, Threatened Species Recovery Plan, Councilpolicy document or other approved policy exists for an area whichhas specified alternate treatment measures or performancestandards for the development area.• Design guidelines, as recognised by Council, indicate that thedevice is not suitable for the site constraints.• The device does not meet local, State or Federal government publichealth criteria.(ii) Pumps and Noise‣ Where pumps are used to supply water from a collection and re-usedevice (eg roofwater tank, stormwater, reclaimed water) then noisemitigation measures are to be put in place to ensure that the device doesnot breach legislative requirements and standards.‣ The noise mitigation measures are to be submitted to Council prior toapproval.‣ All connections to be undertaken by qualified plumber and electrician.Part I – Other Considerations – Water Sensitive Urban Design I.101
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Part I - Other Considerations - Richmond Valley Council

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