B-2 – Area 2 - Assessment of Environmental Effects 18 Figure 11: Mataura Stream and tributaries (GHD 2022). The Mataura Stream has a catchment of some 6.6 km². The upper reaches of the Mataura Stream are relatively unmodified and follow a natural flow path from a gully system in the CFP. The stream becomes increasingly modified as it flows through farmland to its confluence with the Ohinemuri River between Corbett Road and Willows Road. The stream flows south-east out of the CFP and along part of the northern boundary of the Willows Road Farm before veering south/south-east on the eastern side of Willows Road, bisecting the Willows Road Farm along a similar alignment to the unmade section of Willows Road. The stream width varies between 5 m to 8 m with a depth of 0.3 m to > 1m. The riparian margins (outside the CFP) have been fenced off to provide a buffer of 5 m on both banks. The riparian vegetation is mixed, with exotic weed species present. Recent bank erosion is evident. Flow gauging data from 2020 and 2021 recorded the Mataura Stream having a median flow of approximately 10,000 m³/day, varying between 54 L/s (on 16 March 2021) to 355 L/s (on 10 July 2020) (GHD 2022).
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