Trends in Clarity, 1989-2007
Notes:
(1) A ‘meaningful’ trend is both statistically significant and environmentally meaningful, while a ‘significant’ trend is statistically significant but not necessarily environmentally meaningful (eg, the scale of the change could be very minor).
(2) An increase in visual clarity is seen as an improvement in water quality, while a decrease is seen as a decline in water quality.
Read table of data of this map
Map showing trends in visual clarity at National River Water Quality Network sites for 1989-2007.
| Site | Trend |
|---|---|
| Waipapa @ Forest Ranger | No significant trend |
| Waitangi @ Wakelins | Meaningful decrease |
| Mangakahia @ Titoki Br. | Meaningful decrease |
| Wairua @ Purua | Meaningful decrease |
| Hoteo @ Gubbs | Meaningful decrease |
| Rangitopuni @ Walkers | No significant trend |
| Waipa @ Otewa | No significant trend |
| Waipa @ Whatawhata | Meaningful decrease |
| Waikato @ Hamilton Traffic Br. | No significant trend |
| Waikato @ Rangiriri | Meaningful increase |
| Waihou @ Te Aroha | No significant trend |
| Ohinemuri @ Karangahake | No significant trend |
| Waipoa @ Kanakanaia | No significant trend |
| Waikohu @ No. 1 Br. | No significant trend |
| Motu @ Waitangirua | No significant trend |
| Motu @ Houpoto | Meaningful increase |
| Tarawera @ Lake outlet | No significant trend |
| Tarawera @ Awakaponga | Meaningful increase |
| Rangitaiki @ Murapara | Meaningful decrease |
| Whirinaki @ Galatea | No significant trend |
| Rangitaiki @ Te Teko | No significant trend |
| Waikato @ Reids Farm | Significant decrease |
| Makaroro @ Burnt Br. | Meaningful increase |
| Tukituki @ Red Br. | No significant trend |
| Ngaruroro @ Chesterhope | Significant increase |
| Ngaruroro @ Kuripapango | No significant trend |
| Mohaka @ Raupunga | Meaningful increase |
| Mohaka @ Glenfalls | No significant trend |
| Whanganui @ Te Maire | No significant trend |
| Tongariro @ Turangi | No significant trend |
| Waitara @ Bertrand Rd | No significant trend |
| Manganui @ SH3 | Meaningful increase |
| Waingongoro @ SH45 | No significant trend |
| Whanganui @ Paetawa | No significant trend |
| Rangitikei @ Mangaweka | Meaningful increase |
| Rangitikei @ Kakariki | No significant trend |
| Manawatu @ Weber Rd | No significant trend |
| Manawatu @ Teachers Coll. | Meaningful increase |
| Manawatu @ Opiki Br. | No significant trend |
| Hutt @ Boulcott | Meaningful increase |
| Hutt @ Kaitoke | Meaningful increase |
| Ruamahanga @ Waihenga | No significant trend |
| Ruamahanga @ Wardells | Meaningful increase |
| Ruramahanga @ SH2 | Meaningful increase |
| Motueka @ Woodstock | Meaningful increase |
| Motueka @ Gorge | Meaningful increase |
| Wairau @ Dip Flat | No significant trend |
| Wairau @ Tuamarina | No significant trend |
| Buller @ Longford | Meaningful increase |
| Buller @ Te Kuha | No significant trend |
| Grey @ Dobson | Meaningful increase |
| Grey @ Waipuna | No significant trend |
| Haast @ Roaring Billy | No significant trend |
| Hurunui @ Mandamus | No significant trend |
| Hurunui @ SH1 Br. | No significant trend |
| Waimakariri @ Gorge | Meaningful decrease |
| Waimakariri above old HW Br. | Meaningful decrease |
| Opihi @ Waipopo | No significant trend |
| Opihi @ Rockwood | Meaningful decrease |
| Opuha @ Skipton Br. | No significant trend |
| Waitaki @ Kurow | Meaningful increase |
| Hakatakamea above MH Br. | No significant trend |
| Waitaki @ SH1 Br. | Meaningful increase |
| Clutha @ Luggate Br. | No significant trend |
| Kawarau @ Chards | No significant trend |
| Shotover @ Bowens Peak | No significant trend |
| Clutha @ Millers Flat | Meaningful increase |
| Taieri @ Tiroiti | No significant trend |
| Sutton @ SH87 | No significant trend |
| Taieri @ Outram | No significant trend |
| Clutha @ Balclutha | No significant trend |
| Mataura @ Seaward Down | Meaningful increase |
| Mataura @ Parawa | Meaningful increase |
| Oreti @ Lumsden | Meaningful increase |
| Oreti @ Riverton HW Br. | Meaningful increase |
| Waiau @ Tuatapere | Meaningful increase |
| Monowai below Gates | Significant increase |
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