The Orari River is situated in the Orari-Opihi-Pareora Zone (interactive catchment map). The river rises to the northwest of the Four Peaks Range, initially flowing north then east to circumnavigate the range before flowing southwest across the Canterbury Plains. Predominantly fed by precipitation in the hill country rather than snow melt, the river is also fed from spring-fed tributaries. The extensive lowland lagoons and hapua are fed by these waterways, and their health reflects the cumulative effects of all the activities up stream. In addition, the zone is bounded in the north by the Rangitata, a large alpine river whose flood waters are being captured for further irrigation in the zone. The towns of Geraldine and Orari are both located close to its banks. The Orari River reaches the Canterbury coastline 8 kilometres east of Temuka.
Weeds have taken over most of the braidplain of the river, confining it to just one or two channels. This video shows work undertaken by Fulton Hogan to clear weeds from the Burdon St. ford, to attract nationally endangered black-fronted terns, 6 of which are visible towards the end of the video.
Biodiversity & cultural significance
Important Bird Areas on Orari River: links to 6-page PDF file that includes maps, habitat types, and threats relevant to this river. This document was extracted from Forest & Bird’s 177-page 20Mb file on all rivers, lakes, and coastal areas.
Extract from the Orari-Opihi Zone Implementation Programme (ZIP) (page 6-7): ‘Water is precious and limited. It must be managed in ways that recognise and balance its importance for cultural, economic and recreational use, aesthetic and landscape values and biodiversity values – and delivers both individual and community good. We affirm and recognise tangata whenua and the value they place on mahinga kai, and the priority of available high quality sources of drinking water in rivers, waterways and aquifers. We also recognise the intrinsic value of aquatic ecosystems and river health (quality and flow), and the need to both prevent further decline and then restore wetlands and waterways. We know that to achieve all the targets of the CWMS within our zone it is necessary to strategically manage the water within our zone and provide opportunities to bring more water into the zone.’
In May 2005, a public meeting held in Geraldine resolved that a management strategy was needed for the Orari River and its catchment, from its headwaters to the sea. The community, with support from Environment Canterbury and NZ Landcare Trust, spent three years creating the Strategy, whose Mission Statement is to: “To sustainably manage the Orari River Catchment, integrating its ecological, social, economic and cultural values.”
The focus of the Strategy is:
- Pest and weed control
- Landscape values and ecological protection
- Flood and gravel management
- Water quality and quantity
- Education, recreation and access
- Economic use and development
The Orari River Protection Group was set up to prevent any degradation of the Orari River including a proposed dam for an irrigation scheme. In 2016, working with members and BRaid under guidance from ECan, Fulton-Hogan undertook weed-clearing and initiated island formation to create suitable black-fronted tern breeding habitats. Fulton Hogan was subsequently awarded Bronze accreditation under the Braided Rivers Partnership Project.
References & research material
- Jolly (2016) Orari River birds and flow modelling results
- ECan document library: enter ‘Orari River’ in the ‘keywords‘ search field
- DOC catalogue of scientific publications: enter the relevant search terms in the ‘search’ dialogue box. You may need to vary your search, for example ‘black stilt’ gives far more results than ‘kaki’ or ‘kakī’
- See Rivers for a more comprehesive list of braided rivers research and reference material