Waingaro River (Waikato)
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| Waingaro River | |
|---|---|
 Waingaro Landing and mangroves at mouth of Waingaro River | |
 | |
| Location | |
| Country | New Zealand |
| Physical characteristics | |
| Source | |
| • elevation | 150 m (490 ft) |
| Mouth | |
• location | Raglan Harbour |
• elevation | 0 m (0 ft) |
| Length | 18 km (11 mi) |
| Basin size | 123 km2 (47 sq mi) |
The Waingaro River is a river of the Waikato region of New Zealand's North Island. It flows generally southwest from its origins near Glen Afton and Glen Massey, west of Ngāruawāhia, to reach a northern arm of Raglan Harbour (see 1:50,000 map). Its main tributary is Kahuhuru Stream, which Highway 22 follows for several kilometres. Tributaries total about 170 kilometres (110 mi).[1] At Waingaro it is fed by a hot spring.
Pollution
The Waingaro River is one of the largest sources of sediment in Whaingaroa Harbour, partly because it is 99 percent unfenced.[3]
Pollution has been worsening for phosphorus, though nitrogen has improved, as shown in this table of important (i.e. slope direction probability over 95% and RSKSE over ±1% pa) improvements, or deteriorations (-) in relative seasonal Kendall slope estimator (RSKSE) trends (monthly records are flow-adjusted using a Lowess curve fit with 30% span.) -[4] Turbidity is also poor.[5]
| % per year | Nitrate-N | Total phosphorus | Dissolved reactive P |
|---|---|---|---|
| 1993–2017 | 1.0 | -1.0 | -1.0 |
| 2008–2017 | -3.4 |
