Waipoua River 20130219.pdf - Northland Regional Council

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Figure 4 Monitoring sites in the harbour and its catchment3.2 Water quality and the river ecosystemThe ecological health, or integrity, of the river ecosystems are related to a number ofenvironmental factors including, but not limited to, the availability of suitable habitat types(e.g. diverse range of substrate sizes, aquatic plants, large woody debris and varied flowtypes), food and light availability, disturbance and high water quality. It is important to notethat the relationship between ecosystem health and environmental factors is often verycomplex and unpredictable.In rivers the water quality parameters of concern in terms of ecological health are, in noparticular order, temperature and dissolved oxygen, clarity, nutrients, suspended solids.Faecal pathogens are not known to affect aquatic ecosystems. The state of water qualityfrom a human health perspective is discussed in section 3.2.5 below. Biological monitoringinformation, such as invertebrates, periphyton, habitat assessment and fish, can be used tohelp determine the impacts of water quality, if any, on river ecosystems, however, asmentioned above causal effects are not always clear.The <strong>Council</strong> has adopted a river classification based on a system developed by Cawthron(Wilkinson, 2007). <strong>River</strong>s are classified into five classes; Excellent, Very Good, Moderate,Degraded and Very Degraded, based on a number of connected water quality indicators;nutrients, physical properties, clarity, bacteriological and invertebrates (Table 4).22
Table 4 Classification system based on Wilkinson (2007). The median results for a site areused to determine the class from A to E. Source: NRC 2012b.Indicator(values in mg/L unlessspecified)A – Excellent B - Very Good C - Moderate D - DegradedE - VeryDegradedNutrientsNitrate-NAmmonia-N
Page 6 and 7: 1 Introduction1.1 BackgroundThe Wai
Page 10 and 11: The Crown purchased the land that i
Page 13 and 14: 2.2.2.1 PeriphytonPeriphyton is fou
Page 15 and 16: At low altitude, forest association
Page 17 and 18: Figure 3 Common uses of the Waipoua
Page 19 and 20: 2.3 Managing the River and its catc
Page 21: Stream habitat assessments at RWQMN
Page 25 and 26: Table 6: Trend analysis results for
Page 27 and 28: 3.2.5 Invertebrate community health
Page 29 and 30: 2009 the community at the Waipoua R
Page 31 and 32: Northland Regional Council currentl
Page 33 and 34: There is no information on groundwa
Page 35 and 36: evidence that the causeway on Waipo
Page 37 and 38: on the river ecosystem, particularl
Page 39 and 40: However, overall the benefits of ob
Page 41 and 42: SQMCITPSemi Quantitative Macroinver
Page 43 and 44: Ogle, L. and Cook, T. (2005). North
Page 45 and 46: Table 13 cont. Macroinvertebrates r

Waipoua River 20130219.pdf - Northland Regional Council

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