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This layer contains information on the estimated cumulative discharge of nitrogen to land (in kilograms per year) from onsite wastewater management systems within Community Drinking Water Protection Zones (CDWPZ) in Waitaha Canterbury. The estimates were generated in 2025 by PHF Science and the CDWPZ are valid for that time. |
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This layer contains information on the estimated cumulative discharge of nitrogen to land (in kilograms per year) from onsite wastewater management systems within Community Drinking Water Protection Zones (CDWPZ) in Waitaha Canterbury. The estimates were generated in 2025 by PHF Science and the CDWPZ are valid for that time. |
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PHF Science |
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5000 |
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[] |
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<DIV STYLE="text-align:Left;"><DIV><DIV><P><SPAN STYLE="font-size:12pt">PHF Science estimated the Total Nitrogen loading from OWMS discharges in each </SPAN><SPAN STYLE="font-size:12pt">CDWPZ using mapped OWMS locations (for consented and estimated OWMS) and applying assumptions from measured nitrogen concentrations in wastewater</SPAN><SPAN STYLE="font-size:12pt">. Further details are documented in the PHF Science Report "report "</SPAN><SPAN STYLE="font-style:italic;font-size:12pt">Estimating onsite wastewater densities and their associated Total Nitrogen and Total Phosphorus mass loading rates across Waitaha Canterbury</SPAN><SPAN STYLE="font-size:12pt">" by Qui and Humphries, February 2026. </SPAN></P></DIV></DIV></DIV> |
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<DIV STYLE="text-align:Left;"><DIV><DIV><P><SPAN STYLE="font-size:12pt">Nitrogen loading estimates are</SPAN><SPAN STYLE="font-size:12pt"> based on consented and estimated OWMS locations which were generated by a desktop analysis in 2025 and have not been verified in the field. This layer is not updated automatically when OWMS are consented, installed or decommissioned</SPAN><SPAN STYLE="font-size:12pt"> or when community supply sources come online or are taken out of service or have their protection zone refined</SPAN><SPAN STYLE="font-size:12pt">. </SPAN><SPAN STYLE="font-size:12pt">Details on the CDWPZ were captured from Environment Canterbury data at the time of analysis and may not be consisted with Taumata Arowai's records in the public water supply register. </SPAN><SPAN STYLE="font-size:12pt">Estimates represent the APPLIED nitrogen in the wastewater, not the N loss/leaching load and do not account for any attenuation in the receiving environment. </SPAN><SPAN STYLE="font-size:12pt">Please see the full PHF Science report for further assumptions and limitations. </SPAN></P></DIV></DIV></DIV> |
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Estimated nitrogen loading from OWMS in Community Drinking Water Protection Zones |
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["OWMS","onsite wastewater management systems","onsite wastewater","nitrogen loading","Nitrogen","nutrients"] |
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en-NZ |
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500000 |
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