Potential efficacy of changes to the Waiatarua Reserve stormwater management system with respect to faecal and nutrient loadings

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dc.contributor.advisor Webster-Brown, Jenny en
dc.contributor.author Stacey, David James en
dc.date.accessioned 2014-07-29T04:38:36Z en
dc.date.available 2014-07-29T04:38:36Z en
dc.date.issued 2003 en
dc.identifier.citation Thesis (MSc--Environmental Science and Geography)--University of Auckland, 2003 en
dc.identifier.uri http://hdl.handle.net/2292/22604 en
dc.description.abstract A study was undertaken over the period 0 1/08/02 to 12/04/03 with the purpose of understanding the nutrient and faecal contamination sources and processes at the Waiatarua Reserve, by monitoring faecal contaminants, nutrient concentrations, turbidity, and water flow rates . Supporting observations on the ecological change occurring in the reserve were made and the reserve was assessed with regards to the desired outcome of more efficient stormwater treatment . Of particular interest was whether it would treat the water sufficiently to prevent adverse effects such as odorous algal blooms, due to nutrient inputs, and health risks, due to faecal contamination in the Orakei Basin . In addition, the data collected in this study will be able to be used as baseline data to determine how effective the upgrade of the reserve, occurring at present, will be once completed (with respect to a reduction in nutrient and faecal loadings). Nitrate levels throughout the reserve were low with an average of 1.0 1 mg/L at the outlet, compared to an ANZECC lowland river systems trigger value of 2. 7 mg/L Aquatic vegetation increased significantly over the course of this study, possibly due to nitrate inputs (the reserve is nitrate limited). There was an average phosphate level at the outlet of 0.20 mg/L, twice the ANZECC trigger value of 0 . 10 mg/L, providing nutrients for algal growth at the reserve and the Orakei Basin. There were faecal contamination levels at the reserve outlet with an average of 4.33 E.coli/ml and 34 .4 faecal coliforms/ml, as opposed to Ministry for the Environment recreational water quality guidelines of 4. 1 E. coli/ml and ANZECC guidelines of 15 faecal coliforms/ml . There were low dissolved oxygen levels throughout the reserve. Temperature, conductivity, pH and turbidity were all within recreational water use guideline values. The majority of bird species observed were in the central wetland area of the reserve, with more native than exotic bird species present. The majority of faecal and nutrient inputs to the reserve were internally generated (cattle grazing in the reserve and phosphate rich soils and clays) . Of the measures to be implemented in the upgrade currently underway, the removal of the cattle will provide the most significant increase in overall water quality at the reserve. en
dc.relation.ispartof Masters Thesis - University of Auckland en
dc.relation.isreferencedby UoA1176707 en
dc.rights Items in ResearchSpace are protected by copyright, with all rights reserved, unless otherwise indicated. en
dc.rights.uri https://researchspace.auckland.ac.nz/docs/uoa-docs/rights.htm en
dc.title Potential efficacy of changes to the Waiatarua Reserve stormwater management system with respect to faecal and nutrient loadings en
dc.type Thesis en
thesis.degree.discipline Environmental Science and Geography en
thesis.degree.grantor The University of Auckland en
thesis.degree.level Masters en
dc.date.updated 2014-07-29T04:22:07Z en
dc.rights.holder Copyright: the author en
dc.rights.accessrights http://purl.org/eprint/accessRights/OpenAccess en

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