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Description: <DIV STYLE="text-align:Left;"><DIV><DIV>Baseline predicted water quality across permanent streams in the Auckland region, inclusive of discharges from all land surfaces draining to freshwater and coast regionwide. Reported for 5,465 sub-catchments spanning ~490,000 Ha of land and inclusive of 107 unique contaminant sources.Baseline water quality layers produced by Auckland Council’s Freshwater Management Tool (<A href="mailto:fwmt@aucklandcouncil.govt.nz">fwmt@aucklandcouncil.govt.nz</A>– Healthy Waters). Freshwater Management Tool developed from US-EPA process-based model package modified by Healthy Waters for application to New Zealand. Baseline outputs have undergone external peer review and are reported on Knowledge Auckland.Baseline water quality layers will be updated on an ad hoc basis to align with updates to Freshwater Management Tool.Baseline water quality assessed continuously (15-min simulation timestep, daily output, multiple-year period). Freshwater Management Tool developed to supplement observational records with continuous data about event and long-term variation in flow, contaminants and contaminant sources to receiving fresh and coastal waterways. Urban and rural resource use simulated for hydrological and contaminant responses from land to water under varying weather (e.g., variation in rainfall intensity and depth, inclusive of varying antecedent conditions). Inclusive of predicted wastewater network contaminant discharges at engineered overflow points based on six of Watercare’s strategic wastewater hydraulic models (type 1 and 2 overflow events at Waiuku township and Army Bay, Mangere, Pukekohe, Rosedale and Warkworth strategic management areas).Modelled instream processes include nutrient transformation, deposition and resuspension of sediment inputs and erosion of stream channel. All hydrological and contaminant inputs from land integrated through a modelled reach network from mountains to sea, demonstrating cumulative effects of resource use on flow, contaminant concentration, contaminant load and contaminant grade.Continuous instream time-series for contaminant concentration converted to daily flow-weighted average concentration prior to assessment for numeric attribute state under national (MfE, 2020) and regional objective guidance (Gadd et al., 2019). Most degraded of corresponding numeric attribute states assigned as overall attribute state to each modelled reach (e.g., A, B, C, D or E where A is least degraded and E is most degraded – note only E. coliincludes an E state, all other contaminants graded from A to D). Attribute states reported for five-year baseline period (2013-2017) in line with requirements for National Policy Statement for Freshwater Management. Attribute states reported for nutrients (total oxidised nitrogen, total ammoniacal nitrogen, dissolved reactive phosphorus), faecal indicator bacteria (E. coli) and heavy metals (dissolved copper, dissolved zinc). Note, total oxidised nitrogen reported as equivalent to nitrate-nitrogen and total ammoniacal nitrogen as equivalent to ammoniacal-nitrogen, under National Objective Framework (MfE, 2020)Continuous land-based time-series for contaminant concentration and flow converted to annualised load to freshwater and coastal receiving environment. Land-derived loads converted into sub-catchment yield. Sub-catchment average annual yields reported for 15-year baseline period (2003-2017).For all queries email: <A href="mailto:fwmt@aucklandcouncil.govt.nz">fwmt@aucklandcouncil.govt.nz</A>or contact Healthy Waters – Regional Planning.A summary of the fields and their definitions is as follows:<TABLE><TBODY><TR><TD>Field</TD><TD>Description</TD></TR><TR><TD>Sub-catchment ID</TD><TD>Unique sub-catchment and reach identifier. First two digits identify the corresponding watershed.</TD></TR><TR><TD>Watershed</TD><TD>One of ten major watersheds in the Auckland region that drain to coast or neighbouring region (see Consolidated Receiving Environments layer in Geomaps).</TD></TR><TR><TD>Catchment</TD><TD>One of 233 catchments that drain to a specific stream or stormwater outfall (see Consolidated Stormwater Catchments layer in Geomaps).</TD></TR><TR><TD>Total Suspended Sediment Yield To Edge Of Stream (kg/Ha/yr)</TD><TD>Yield to edge of stream from all surfaces across sub-catchment of all suspended sand, silt and claymass.</TD></TR><TR><TD>E. Coli Yield To Edge Of Stream (#billions/Ha/yr)</TD><TD>Yield to edge of stream from all surfaces across sub-catchment of faecal indicator bacteria (Escherichia coli).</TD></TR><TR><TD>Total Nitrogen Yield To Edge Of Stream (kg/Ha/yr)</TD><TD>Yield to edge of stream from all surfaces across sub-catchment of all forms of nitrogen inclusive of particulate and dissolved mass.</TD></TR><TR><TD>Total Phosphorus Yield To Edge Of Stream (kg/Ha/yr)</TD><TD>Yield to edge of stream from all surfaces across sub-catchment of all forms of phosphorus inclusive of particulate and dissolved mass.</TD></TR><TR><TD>Total Copper Yield To Edge Of Stream (g/Ha/yr)</TD><TD>Yield to edge of stream from all surfaces across sub-catchment of all forms of copper inclusive of particulate and dissolved mass.</TD></TR><TR><TD>Total Zinc Yield To Edge Of Stream (g/Ha/yr)</TD><TD>Yield to edge of stream from all surfaces across sub-catchment of all forms of zinc inclusive of particulate and dissolved mass.</TD></TR><TR><TD>Total Suspended Sediment Yield Delivered To Coast (kg/Ha/yr)</TD><TD>Yield delivered to coast from all surfaces across sub-catchment of all suspended sand, silt and clay mass.</TD></TR><TR><TD>E. Coli Yield Delivered To Coast (#billions/Ha/yr)</TD><TD>Yield delivered to coast from all surfaces across sub-catchment of faecal indicator bacteria (Escherichia coli).</TD></TR><TR><TD>Total Nitrogen Yield Delivered To Coast (kg/Ha/yr)</TD><TD>Yield delivered to coast from all surfaces across sub-catchment of all forms of nitrogen inclusive of particulate and dissolved mass.</TD></TR><TR><TD>Total Phosphorus Yield Delivered To Coast (kg/Ha/yr)</TD><TD>Yield delivered to coast from all surfaces across sub-catchment of all forms of phosphorus inclusive of particulate and dissolved mass.</TD></TR><TR><TD>Total Copper Yield Delivered To Coast (g/Ha/yr)</TD><TD>Yield delivered to coast from all surfaces across sub-catchment of all forms of copper inclusive of particulate and dissolved mass.</TD></TR><TR><TD>Total Zinc Yield Delivered To Coast (g/Ha/yr)</TD><TD>Yield delivered to coast from all surfaces across sub-catchment of all forms of zinc inclusive of particulate and dissolved mass.</TD></TR><TR><TD>Simulation Period</TD><TD>Model reporting period.</TD></TR></TBODY></TABLE>ReferencesMinistry for Environment. 2020. National Policy Statement for Freshwater Management 2020. <A href="https://environment.govt.nz/assets/Publications/Files/national-policy-statement-for-freshwater-management-2020.pdf">https://environment.govt.nz/assets/Publications/Files/national-policy-statement-for-freshwater-management-2020.pdf</A>Gadd, J., Williamson, R., Mills, G., Hickey, C., Cameron, M., Vigar, N., Buckthought, L., and Milne, N. 2019. Developing Auckland-specific ecosystem health attributes for copper and zinc: Summary of work to date and identification of future tasks. Prepared by the National Institute of Water and Atmospheric Research, NIWA and Diffuse Sources Ltd. for Auckland Council. Auckland Council discussion paper. DP2019/004. <A href="https://knowledgeauckland.org.nz/media/1099/dp2019-004-developing-auckland-specific-ecosystem-health-attributes-cu-zn.pdf">https://knowledgeauckland.org.nz/media/1099/dp2019-004-developing-auckland-specific-ecosystem-health-attributes-cu-zn.pdf</A></DIV></DIV></DIV>

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