0390061 W6PR002 Version 7 Draft - Brisbane City …

1 guidelines for Pollutant Export Modelling inBrisbane Version 7 - Draft (Supplement to BCC Water Quality Management guidelines )October 2003 stormwater quality improvementdevices: an artificial wetland, atrash rack and a grassed swaleGuidelines for Pollutant Export Modelling in Brisbane Version 7 DraftRevision 2iBCC would like to acknowledge the following individuals for their contribution to the guidelines for Pollutant ExportModelling in Brisbane Version 7- Draft :Tim FletcherCRC-Catchment HydrologyGraham JenkinsSchool of Environmental Engineering, Griffith UniversityMalcolm EadieEcological Engineering Pty LtdMatt FranceyMelbourne WaterDale Brown Melbourne WaterGuidelines for Pollutant Export Modelling in Brisbane Version 7 DraftRevision 2iiTable of Simulation Pollutant Treatment Modelling from the for Development Applications for model Pollutant Pollutant of Treatment INDEX47 guidelines for Pollutant Export Modelling in Brisbane Version 7 DraftRevision IntroductionThese guidelines are intended to assist developers and consulting engineers to establish inputparameters specific to Brisbane for use in two common

2 stormwater quality modellingprograms: the Model for Urban stormwater Improvement Conceptualisation ( music ) andAQUALM-XP. The guidelines also detail the modelling data that are recommended forinclusion in development applications. These guidelines will be used by Brisbane CityCouncil (BCC) officers when they assess development applications relating to runoff waterquality and stormwater treatment has prepared these guidelines as a supplement to, rather than a substitute for, its WaterQuality Management guidelines (BCC 2000a) and the music / AQUALM-XP users manuals (CRC-CH 2002; WP Software 1992) and supersedes the guidelines for PollutantExport Modelling in Brisbane Version 6.

3 Figure shows where this document sits in theframework for water quality management under Brisbane City Council s planning undertake water quality modelling?Council requires water quality modelling to be completed for some development activities(BCC 2000a). Such modelling predicts the likely water quality emanating from a catchmentand the performance of specific stormwater treatment measures. This evaluation can becompared with performance targets such as water quality objectives (WQOs), enablingstormwater managers to minimise the impacts on receiving waters of changes in land use are measurable long-term goals for the quality of receiving waters.

4 The medianannual pollutant concentrations (from combined wet and dry weather flows) generated by adevelopment during its operational phase must meet the WQOs. For further information onWQOs and their application, please consult the guidelines on Identifying and ApplyingWater Quality Objectives in Brisbane City (BCC 2000b), the Water Quality ManagementGuidelines (BCC 2000a) and the relevant codes and policies in Brisbane City Plan 2000(BCC 2000c), hereafter referred to as City 13 of the Draft Australian Runoff Quality (ARQ) (IEAust 2003) also providesfurther information on the philosophies of modelling of urban stormwater should undertake water quality modelling?

5 The Water Quality Management guidelines (BCC 2000a) define the process for determiningwhether water quality modelling is needed for a subdivision and development application. Ifrequired, the modelling must be undertaken by a qualified specialist with demonstratedexperience in modelling water quality or expertise in the processes upon which the model isbased. It is strongly encouraged that all submissions to BCC relating to water qualitymodelling be accompanied by a letter of certification or endorsement from either aGuidelines for Pollutant Export Modelling in Brisbane Version 7 DraftRevision 22 Registered Professional Engineer of Queensland (RPEQ) or similar professional withrecognised industry.

6 The Framework for Water Quality Management Under Brisbane City Council s Planning SchemeIntegrated Planning Act1997 Environmental ProtectionAct 1994 Environmental Protection(Water) PolicyNational Water QualityManagement StrategyBCC Corporate PlanWaterways CodeCodeAcid Sulfate Soil Code guidelines for PollutantExport Modelling inBrisbane City (2003) Version 7 National waterqualitymanagement policyStatelegislation High level BCC policyDetailedpolicy in theCity PlanPrimary waterqualitymanagementguidelinesSecondar y,technicalwater qualitymanagementguidelinesBCC guidelines :BCC Guideline: Guideline on Identifyingand Applying WQOs inBrisbane City (2000)BCC Subdivision andDevelopment GuidelinesPart C Water QualityManagement guidelines BCC guidelines .

7 Design guidelines forSQIDs (1999) Erosion and SedimentControl (ESC) Standard ( Version 8, BCC 2000) relevant to large sites Best Practice Guidelinesfor the Control ofStormwater Pollution fromResidential Building Sites (2003) 1997 BCC City PlanBCCU rban StormwaterManagement Strategy (under review) stormwater ManagementPlanning Scheme Policy(Management of UrbanStormwater Quality)Planning Scheme Policy(Acid Sulfate Soils)National Water QualityManagement StrategyGuidelines for Pollutant Export Modelling in Brisbane Version 7 DraftRevision 23 What models are catered for by the guidelines ?Input parameters have been produced for the two most frequently used models in Brisbane : music and is the basis for the guidelines ?

8 For approximately ten years BCC has been monitoring the quality of urban stormwater inBrisbane (BCC 1999a, 2000d, 2001a, 2002a, 2003a). The research has been used to developinput parameters for water quality modelling in Brisbane . Specifically, pollutantconcentrations and their export relationship with certain land uses have been data are augmented by five years research into the efficiency of several StormwaterQuality Improvement Devices (SQIDs) including vegetated swales, wetlands and grosspollutant traps (GPTs) (BCC 2000e, 2001b, 2002b, 2003b).A number of other monitoring programs are also being conducted in South East currently involved in monitoring include Ipswich City Council, Gold Coast CityCouncil and the Environmental Protection Agency.

9 Please contact these agencies for furtherinformation on their monitoring methods or models other than music or AQUALM-XP are used to assess theperformance of stormwater management measures ( XP-SWMM), practitioners need todemonstrate: the suitability of the model that the results meet the for Pollutant Export Modelling in Brisbane Version 7 DraftRevision MUSICMUSIC is a decision support tool for stormwater managers (CRC-CH 2002). It helps them to plan and design (to conceptual level)appropriate urban stormwater management systems forcatchments. music has been developed by the CooperativeResearch Centre for Catchment Hydrology (CRC-CH) and wasreleased in May estimates stormwater pollution generation and simulates the performance of a groupof stormwater management measures configured in series or parallel to form a treatmenttrain.

10 By simulating the performance of stormwater quality improvement measures music determines if a proposed system can meet users manual has been developed by the CRC-CH. Technical support and information ontraining sessions can be found on the CRC website: is proposed that music will be updated once a year for the next four years, to allow forinclusion of the outcomes of new science. These updates to music may have a significantimpact on current modelling approaches and hence these guidelines will be updatedperiodically to reflect this. Users of these guidelines are advised to confirm they are usingthe most up-to-date Version by contacting the Brisbane City Council, Urban ManagementDivision s Water Resources Branch via the Brisbane City Council Call Centre on 07 Notes music does not currently incorporate all aspects of stormwater management thatdecision-makers must consider.