U:\2021\BM210482_IBo_Waihi_North_Project\Documents\WNP_Freshwater_Report_May_2022\FINAL_Freshwater_Report_FOR DELIVERY_June 2022\FINAL DELIVERED 17 JUNE 2022\WAI-985-000-REP-LC-0007_Rev0_Freshwater_20220621_FINAL.docx 14.3 Waiharakeke Stream catchment 14.3.1 Dewatering of the WUG tunnel GWS have indicated that the temporary loss of flow from the Waiharakeke Stream will be indiscernible and we conclude that the effects on the ecological values of the stream will be negligible. 14.4 Mataura Stream Catchment 14.4.1 Effects on Mataura Stream GHD (2022A) concluded that the effects on the flow in the Mataura Stream resulting from the proposed WRS development at the Willows Farm site are expected to be minimal. The footprint of the proposed rock stack (~5.5 ha) is estimated to be less than 1% of the catchment area and will be removed from the catchment during peak development and runoff will be collected and diverted to the WTP. GHD (2022A) concluded that this is not expected to have a noticeable effect of the Mataura Stream flow. 14.4.2 Effects on Mataura Stream Tributary (Tributary 2) 14.4.2.1 Effects The proposed infrastructure and rock stack associated with the portal / tunnel on the farmland site has been located to avoid and minimise impacts on the unnamed tributaries as much as possible. However, the rock stack will result in some loss of stream length. The proposed rock stack is sited approximately 200 m upstream from the confluence with Mataura Stream. The placing of the rock stack means that overall, some 390 m of stream (permanent and intermittent) length will be temporarily lost from Tributary 2. 14.4.2.2 Functional Need WSP Golder (2022) outline the functional requirements for the rock stack being placed in the tributary 2 catchment. • Close proximity to the WUG portal. • Location furthest from the public roads and adjacent properties, with the WRS sited in a natural depression that would lead to least visual amenity and landscape effects. • The low value of the tributary; the WRS was located above an existing farm access track, in an active grazing area, avoiding the higher ecological value of the lower reach and Mataura Stream. • Gradient and shape of the natural depression that allows effects to be effectively and efficiently managed. • Avoids wetland areas and areas of high value flora and fauna.
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