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

More documents

Recommendations

Info

River and stream water quality and ecology in the Wellington region: State and trends Table 5.3: Summary of streambed periphyton cover (based on monthly assessments undertaken between July 2008 and June 2011) 1 and biomass (chlorophyll a based on annual assessments in 2009, 2010 and 2011) at 46 RSoE sites. An overall periphyton ‘class’ for each site is also presented based on compliance with the MfE (2000) periphyton guidelines (see Table 5.2) Periphyton streambed cover (%) Chlorophyll a (mg/m2 ) Site no. and name Mat Filamentous Mean Max % n>60 Mean Max % n>30 n 2009 2010 2011 Mean Quality class RS03 Waitohu S at Forest Pk 0.5 10 0 0.6 15 0 34 1.1 0.8 1.4 1.1 Excellent RS05 Otaki R at Pukehinau 1.0 27 0 2.0 39 2.8 31 0.7 2.2 1.0 1.3 Excellent RS06 Otaki R at Mouth 3.8 61 2.8 6.4 50 8.3 33 2.5 2.1 1.8 2.2 Good RS09 Waikanae R at Mangaone Walk 0 0 0 0 0 0 36 0.2 0.9 0.3 0.5 Excellent RS10 Waikanae R at Greenaway Rd 8.8 48 0 1.3 15 0 32 19.8 9.7 19.1 16.2 Excellent RS11 Whareroa S at Waterfall Rd 0 0 0 0 0 0 32 29.7 0.6 1.1 10.4 Excellent RS13 Horokiri S at Snodgrass 0.7 7 0 6.3 74 8.3 34 34.4 46.1 77.2 52.6 Good RS14 Pauatahanui S at Elmwood Br 0 0 0 21.7 100 19.4 30 141.4 23.3 53.1 72.6 Fair RS15 Porirua S at Glenside 1.3 20 0 23.6 91 25.0 30 43.3 76.7 30.3 50.1 Poor RS16 Porirua S at Wall Park (Milk Depot) 2.7 29 0 24.7 84 30.6 30 38.5 55.3 20.0 37.9 Poor RS17 Makara S at Kennels 0 0 0 1.6 28 0 29 5.7 15.4 0.1 7.1 Excellent RS18 Karori S at Makara Peak 3.1 38 0 28.4 97 27.8 31 71.1 25.1 10.8 35.6 Poor RS19 Kaiwharawhara S at Ngaio Gorge 4.0 43 0 29.9 100 36.1 33 61.5 34.2 37.8 44.5 Poor RS20 Hutt R at Te Marua Intake Site 0 0 0 0 0 0 29 0.8 0.9 0.4 0.7 Excellent RS21 Hutt R opp. Manor Park G.C. 15.8 88 5.6 3.5 20 0 29 18.1 59.8 1.6 26.5 Good RS22 Hutt R at Boulcott 14.6 100 2.8 4.0 31 2.8 25 17.1 119.3 20.6 52.3 Good RS23 Pakuratahi R 50m d/s Farm Ck 4.3 31 0 0.3 6 0 30 4.4 20.2 0.2 8.2 Excellent RS24 Mangaroa R at Te Marua 11.3 54 0 8.5 79 5.6 30 59.8 72.6 83.9 72.1 Poor RS25 Akatarawa R at Hutt R confl. 0.4 9 0 0 0 0 32 2.3 0.3 7.8 3.5 Excellent RS26 Whakatikei R at Riverstone 2.8 30 0 2.5 46 2.8 32 13.6 5.0 6.8 8.4 Excellent RS28 Wainuiomata R at Manuka Track 0 1 0 0 0 0 34 6.8 10.2 1.4 6.1 Excellent RS29 Wainuiomata R u/s of White Br 7.5 43 0 2.8 19 0 28 40.2 236.3 78.6 118.4 Fair RS30 Orongorongo R at Orongorongo Stn 1.3 11 0 15.5 100 19.4 22 19.9 3.3 3.0 8.8 Fair RS31 Ruamahanga R at McLays 0.6 17 0 0.1 3 0 29 0.3 0.4 1.8 0.8 Excellent RS32 Ruamahanga R at Te Ore Ore 0.7 12 0 1.7 20 0 19 27.7 34.8 90.5 51.0 Good RS33 Ruamahanga R at Gladstone Br 3.5 60 0 5.0 42 2.8 22 47.0 65.0 58.3 56.8 Fair RS34 Ruamahanga R at Pukio 0 0 0 13.0 100 5.6 16 22.0 91.5 49.0 54.1 Good RS35 Mataikona Trib at Sugar Loaf Rd 0 0 0 0.2 5 0 34 7.3 11.7 4.0 7.7 Excellent RS37 Taueru R at Gladstone 1.7 30 0 69.4 100 50.0 21 477.2 583.7 486.7 515.8 Poor RS38 Kopuaranga R at Stewarts 6.8 26 0 44.4 100 34.3 20 690.0 515.2 350.5 518.6 Poor RS40 Waipoua R at Colombo Rd Br 22.3 100 13.9 7.8 53 8.3 34 34.6 33.7 46.1 38.1 Fair RS41 Waingawa R at South Rd 0.6 11 0 1.2 19 0 31 51.3 8.6 1.5 20.5 Good RS43 Motuwaireka S at Headwaters 0 0 0 0 0 0 35 2.9 1.6 1.3 2.0 Excellent RS44 Totara S at Stronvar 10.2 100 5.7 16.9 100 20.0 31 14.7 7.9 25.8 16.1 Fair RS45 Parkvale Trib at Lowes Reserve 0 0 0 0 0 0 28 18.2 41.4 30.3 30.0 Excellent RS46 Parkvale S at Weir 2.7 31 0 22.9 97 19.4 26 304.4 309.3 49.6 221.1 Poor RS47 Waiohine R at Gorge 0.9 20 0 0.1 3 0 27 0.3 0.7 0.5 0.5 Excellent RS48 Waiohine R at Bicknells 0.7 10 0 2.4 27 0 28 48.0 51.4 6.5 35.3 Good RS49 Beef Ck at Headwaters 0.2 5 0 0 0 0 36 7.0 10.5 7.6 8.4 Excellent RS50 Mangatarere S at SH 2 3.5 56 0 21.9 100 22.2 30 143.2 47.8 38.7 76.5 Poor RS51 Huangarua R at Ponatahi Br 25.2 80 11.1 36.1 100 38.9 24 122.9 96.3 280.4 166.6 Poor RS52 Tauanui R at Whakatomotomo Rd 0.3 9 0 1.3 21 0 28 0.8 30.6 1.7 11.1 Excellent RS53 Awhea R at Tora Rd 1.7 36 0 55.3 100 38.9 21 35.8 29.3 60.8 42.0 Poor RS54 Coles Ck Trib at Lagoon Hill Rd 0 0 0 16.3 80 17.2 27 41.6 21.5 59.6 40.9 Fair RS55 Tauherenikau R at Websters 0 0 0 8.0 85 11.1 29 12.1 10.2 2.0 8.1 Fair RS56 Waiorongomai R at Forest Pk 0 0 0 1.0 31 2.9 32 1.7 0.4 0.6 0.9 Excellent 1 Mean and maximum values, and % compliance with guideline values were calculated based on the total number of times a site was visited, not the number of periphyton assessments able to be made at each site (this is because the majority of instances in which periphyton could not be assessed coincided with high river or stream flows when periphyton cover was likely to be minimal/below guidelines). WGN_DOCS-#1100598-V3 PAGE 59 OF 160
River and stream water quality and ecology in the Wellington region: State and trends Eight sites exceeded the MfE (2000) filamentous periphyton streambed cover guideline (30% cover) on at least a quarter or more of sampling occasions during the reporting period (Table 5.3). Four of these sites are located on small streams draining predominantly urban catchments (Porirua Stream at Glenside, Porirua Stream at Wall Park, Karori Stream at Makara Peak and Kaiwharawhara Stream at Ngaio Gorge) and the other four sites are located in predominantly pastoral catchments that drain the eastern Wairarapa hill country (Taueru River at Gladstone, Kopuaranga River at Stewarts, Huangarua River at Ponatahi Bridge and Awhea River at Tora Road). The sites that most regularly exceeded the MfE (2000) mat periphyton streambed cover guideline were Waipoua River at Colombo Road and Huangarua River at Ponatahi Bridge (14% and 11% of sampling occasions, respectively). Hutt River opposite Manor Park, Hutt River at Boulcott and Mangaroa River at Te Marua also recorded elevated mat periphyton cover on some occasions (Table 5.3). 5.1.3 Periphyton biomass Twenty two of the 46 RSoE sites exceeded the MfE (2000) chlorophyll a guideline for benthic biodiversity (50 mg/m 2 ) on at least one of the annual sampling occasions over the three-year reporting period (Table 5.3). Four sites exceeded the guideline twice and three sites exceeded in all three years: Taueru River at Gladstone, Kopuaranga River at Stewarts and Huangarua River at Ponatahi Bridge (Table 5.3). Two sites exceeded the MfE (2000) chlorophyll a guideline of 120 mg/m 2 for the protection of trout habitat and fisheries on one sampling occasion (Wainuiomata River upstream of White Bridge and Mangatarere Stream at SH 2). Two sites (Parkvale Stream at Weir and Huangarua River at Ponatahi Bridge) exceeded the threshold twice and two sites exceeded on all three sampling occasions (Taueru River at Gladstone and Kopuaranga River at Stewarts). 5.1.4 Periphyton classes and relationship with landcover Overall, 19 RSoE sites were assigned a periphyton classification of ‘excellent’, indicative of a very high level of compliance with the MfE (2000) periphyton cover and biomass guidelines. Eight sites were classified as ‘good’ (17%), eight were ‘fair’ (17%) and 11 were ‘poor’ (24%). The majority (17) of sites classed as ‘excellent’ are located in catchments dominated by indigenous forest (Figure 5.1), with the remaining two sites (Makara Stream at Kennels and Parkvale Stream at Lowes Reserve) located in pasture dominated catchments. Sites classed as ‘poor’ have upstream catchments dominated by either pasture or urban landcover. There was a strong negative correlation (rs=-0.73, p
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
Page 10 and 11:
Page 12 and 13:
Page 14 and 15:
Figure 2.1: RSoE monitoring sites a
Page 16 and 17:
2.4.2 Biological variables River an
Page 18 and 19: River and stream water quality and
Page 52 and 53: 4.2 Temporal trends River and strea
Page 72 and 73: TN (mg/L) Temperature ( 0 c) Shade
Page 80 and 81: Chlorophyll a (mg/m 2 ) 90 80 70 60
Page 82 and 83: 25th percentile summer time flow m
Page 90 and 91: RS06 Shade RS11 Habitat RS35 RS49 R
Page 106 and 107: IBI Score 60 50 40 30 20 10 0 River
Page 110 and 111: Water quality (n=24) Periphyton (n=
Page 118 and 119:
Page 120 and 121:
Page 122 and 123:
Page 124 and 125:
Page 126 and 127:
Page 128 and 129:
Page 130 and 131:
Page 132 and 133:
Page 134 and 135:
Page 136 and 137:
Page 138:
Appendix 1: Monitoring site details
Page 141 and 142:
Page 143 and 144:
Page 145 and 146:
Page 147 and 148:
Page 149 and 150:
Page 151 and 152:
Page 153 and 154:
Page 155 and 156:
Page 157 and 158:
Page 159 and 160:
Page 161 and 162:
Page 163 and 164:
Page 165 and 166:
Page 167 and 168:
Page 169 and 170:
show all

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

You also want an ePaper? Increase the reach of your titles

Delete template?

Save as template?