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 Table 4.5: Water Quality Index grades for RSoE sites sampled at monthly intervals over June 2008 to July 2011 inclusive, based on compliance of median values with guideline values for six key variables (see Table 4.1) Rank Site No. Site name Water Quality Index (median values) DO% Clarity E. coli NNN Ammonia N DRP REC landcover Excellent 1 RS43 2 RS05 3 RS03 4 RS52 5 RS47 6 RS56 7 RS31 8 RS49 9 RS28 10 RS20 11 RS26 12 RS44 13 RS25 14 RS06 15 RS41 16 RS10 17 RS23 18 RS21 Motuwaireka S at headwaters Otaki R at Pukehinau Waitohu S at Forest Park Tauanui R at Whakatomotomo Rd Waiohine R at Gorge Waiorongomai R at Forest Park Ruamahanga R at McLays Beef Ck at Headwaters Wainuiomata R at Manuka Track Hutt R at Te Marua Intake Site Whakatikei R at Riverstone Totara S at Stronvar Akatarawa R at Hutt confl. Otaki R at Mouth Waingawa R at South Rd Waikanae R at Greenaway Rd Pakuratahi R 50m Below Farm Ck Hutt R Opp Manor Park Golf Club Ind. forest Ind. forest Ind. forest Ind. forest Ind. forest Ind. forest Ind. forest Ind. forest Ind. forest Ind. forest Ind. forest Ex. forest Ind. forest Ind. forest Ind. forest Ind. forest Ind. forest Ind. forest Good 19 RS09 Waikanae R at Mangaone Walkway x Ind. forest 20 RS55 Tauherenikau R at Websters x Pasture 21 RS35 Mataikona trib at Sugar Loaf Rd x Ind. forest 22 RS30 Orongorongo R at Orongorongo St. x Ind. forest 23 RS22 Hutt R at Boulcott x Ind. forest 24 RS54 Coles Ck trib at Lagoon Hill Rd x Ind. forest 25 RS40 Waipoua R at Colombo Rd Bridge x Pasture 26 RS51 Huangarua Ri at Ponatahi Bridge x Pasture 27 RS36 Taueru R at Castlehill x Pasture 28 RS53 Awhea R at Tora Rd x Pasture 29 RS42 Whareama R at Gauge x Pasture 30 RS32 Ruamahanga R at Te Ore Ore x Pasture 31 RS48 Waiohine R at Bicknells x Pasture Fair 32 RS13 Horokiri S at Snodgrass x x Pasture 33 RS29 Wainuiomata R u/s of White Br x x Ind. forest 34 RS11 Whareroa S at Waterfall Rd x x Ind. forest 35 RS33 Ruamahanga R at Gladstone Br x x Pasture 36 RS14 Pauatahanui S at Elmwood Bridge x x x Pasture 37 RS34 Ruamahanga R at Pukio x x x Pasture 38 RS18 Karori S at Makara Peak MBP x x x Urban 39 RS17 Makara S at Kennels x x x Pasture 40 RS19 Kaiwharawhara S at Ngaio Gorge x x x Urban Poor 41 RS45 Parkvale trib at Lowes Reserve x x x Pasture 42 RS24 Mangaroa R at Te Marua x x x x Pasture 43 RS15 Porirua S at Glenside O.C. x x x x Urban 44 RS37 Taueru R at Gladstone x x x x Pasture 45 RS16 Porirua S at Wall Park (Milk Depot) x x x x Urban 46 RS38 Kopuaranga R at Stewarts x x x x Pasture 47 RS46 Parkvale S at Weir x x x x Pasture 48 RS39 Whangaehu R at 250m from conf. x x x x Pasture 49 RS50 Mangatarere S at SH 2 x x x x x Pasture 50 RS04 Waitohu S at Norfolk Crescent x x x x x Pasture 51 RS08 Ngarara S at Field Way x x x x x Urban 52 RS12 Whareroa S at QE Park x x x x x x Pasture 53 RS27 Waiwhetu S at Wainuiomata Hill Br x x x x x x Urban 54 RS07 Mangaone S at Sims Road Bridge x x x x x x Pasture 55 RS02 Mangapouri S at Bennetts Rd x x x x x x Urban 16 If the median DO concentration does not comply with the guideline value, then the WQI grade automatically drops to ‘poor’. WGN_DOCS-#1100598-V3 PAGE 39 OF 160
River and stream water quality and ecology in the Wellington region: State and trends Figure 4.15: Map of Greater Wellington’s WQI grades for RSoE sites sampled at monthly intervals over June 2008 to July 2011 inclusive, based on compliance of median values with guideline values for six key variables (see Table 4.1) Sites that were assigned this grade are all located in catchments dominated by indigenous forest (68–100% cover) and, in one case, exotic forest (Totara Stream at Stronvar). These sites are typically located on the upper reaches of the region’s rivers and streams that are flowing out of the Aorangi, Tararua, Rimutaka ranges. They generally have hill elevation sources of flow and hardsedimentary geology. Thirteen sites draining a mixture of both indigenous forest and pastoral landcover received a water quality grade of ‘good’, indicating that median values for five of the six water quality variables in the WQI complied with their respective guideline values. Visual clarity was the variable ‘good’ sites most commonly failed to meet (Table 4.5). Nine sites were assigned a ‘fair’ water quality grade. These sites all have low elevation sources of flow and are located across a range of landcover types: indigenous forest (two sites), pasture (five) and urban (two). These sites are generally located on smaller streams or the lower reaches of larger rivers (eg, the Wainuiomata and Ruamahanga rivers). Fifteen sites received a water quality grade of ‘poor’ because median values for less than half of the six water quality variables in the WQI complied with their respective guidelines (Table 4.5) or, as in the case of the Parkvale tributary at Lowes Reserve, the median DO value did not comply with the guideline. All poor sites failed to comply with the DRP guideline and, except for the Parkvale tributary at Lowes Reserve, the guidelines for water clarity and E. coli. Sites graded poor are located on the lower reaches of rivers and streams draining PAGE 40 OF 160 WGN_DOCS-#1100598-V3
Page 1 and 2: River and stream water quality and
Page 3 and 4: DISCLAIMER This report has been pre
Page 5 and 6: observed trends were unclear. The p
Page 7 and 8: 5. Periphyton - state and trends 57
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Page 16 and 17: 2.4.2 Biological variables River an
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River and stream water quality and
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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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