B-5 – Area 5 - Assessment of Environmental Effects 25 Figure 13: Location of Area 5 relative to surrounding waterbodies. The Ohinemuri River passes by the eastern site boundary, around Black Hill and past the southern side of Winner Hill before turning south-west under SH2. The Ohinemuri River catchment is approximately 290 km². Waihi is in the upper area of the catchment. Tributaries emerge from steep, forested sub-catchments, through mainly flat farmland to join the river as it flows west. Beyond Waihi, the river runs through the Karangahake Gorge to the Waihou River near Paeroa. OGNZL monitors river water quantity and quality in accordance with resource consent conditions. Records from the Frendrups gauge (between the WPP and the existing northern rock stockpile) indicate a long-term median flow of 75,400 m³/day. To the east of the site, the Ruahorehore Stream meets the Ohinemuri River on the southeast side of Black Hill in the area shown as SNA165A in the District Plan. Ruahorehore Stream has a catchment of approximately 20 km2 and a long term median flow of 27,900 m³/day. It increases flows in the Ohinemuri River below its confluence by approximately 38%.
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