River and stream water quality and ecology - Greater Wellington ...

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River and stream water quality and ecology in the Wellington region: State and trends Figure 3.4: Total number of dairy cattle for each district in the Wellington region with dairy cattle, 2002/03 to 2009/10. Each bar represents a milking season, with the left-most bar for each district representing 2002/03 and the right-most bar representing 2009/10 (Source: Dairy NZ 2010) Figure 3.5: Dairy cattle stocking rates (cows per hectare) for each district with dairy cattle in the Wellington region, 2002/03 to 2009/10. Each bar represents a milking season, with the left-most bar for each district representing 2002/03 and the right-most bar representing 2009/10 WGN_DOCS-#1100598-V3 PAGE 15 OF 160
River and stream water quality and ecology in the Wellington region: State and trends 3.4.2 Significant consented activities This section briefly outlines some of the specific consented land use activities with the potential to impact on river and stream health. These include discharges of municipal, agricultural and industrial wastewater, stormwater discharges, river and stream works, and water abstraction. The resource consent information presented in this section was drawn from Greater Wellington’s ‘Ozone’ database and was current as at 30 June 2010. (a) Discharges to surface water (i) Municipal wastewater discharges The principal discharges to surface water likely to have the greatest impact on water quality and ecosystem health in the Wellington region are discharges of treated municipal sewage (wastewater). There are six such discharges to water; these include wastewater from all five of the Wairarapa’s main townships and the combined wastewater from Paraparaumu, Raumati and Waikanae on the Kapiti Coast (Table 3.3). Table 3.3: Principal municipal wastewater discharges to rivers and streams in the Wellington region as at June 2010 Township City/district Paraparaumu, Raumati & Waikanae Estimated serviced population 1 Kapiti Coast 30,000 Masterton Masterton 17,700 Carterton Carterton 4,100 Greytown South Wairarapa 2,000 Featherston South Wairarapa 2,330 Martinborough South Wairarapa 1,330 1 Estimated from recent resource consent application information. Receiving waterbody & location Mazengarb Drain, a tributary of the Waikanae River. Makoura Stream, approximately 0.8 km above its confluence with the Ruamahanga River near Homebush / Wardell’s Bridge. Mangatarere Stream during April to December (land-based discharge during summer except where high inflows prevent this), approximately 1.5 km from its confluence with the Waiohine River at SH 2. Papawai Stream, approximately 1.5 km from its confluence with the Ruamahanga River upstream of Morrisons Bush. Donald’s Creek, a tributary of Abbotts Creek and Lake Wairarapa. Ruamahanga River, approximately 2.5 km downstream of Waihenga Bridge. In 2009, Masterton District Council’s resource consent to discharge treated wastewater from Masterton was renewed with the requirement that from 2013 onwards, wastewater must be progressively discharged to land. Furthermore, from December 2014, no wastewater can be discharged to the Ruamahanga River during periods of less than median river flow during summer (1 November to 30 April) and less than half median flow during winter (1 May to 31 October). PAGE 16 OF 160 WGN_DOCS-#1100598-V3
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River and stream water quality and
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Chlorophyll a (mg/m 2 ) 90 80 70 60
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RS06 Shade RS11 Habitat RS35 RS49 R
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IBI Score 60 50 40 30 20 10 0 River
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Water quality (n=24) Periphyton (n=
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Appendix 1: Monitoring site details
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