Lake Hood is an 84 ha man-made recreational lake located near Ashburton, Canterbury. In order to meet increased demand on the lake, the client proposed to extend the lake by 94 ha and improve and increase the associated recreational and residential facilities. Tonkin & Taylor were appointed to evaluate the effects of the lake extension on water quality. In addition to the Assessment of Environmental Effects (AEE), the study identifi ed design and management options to improve lake water quality and the aesthetic appeal of the lake.

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Tonkin & Taylor was engaged to undertake monitoring and analysis of the river bed levels around the water intake screens at Watercare’s Tuakau Water Treatment plant on the lower Waikato River. The project included coordinating two bathymetric surveys extending 2 km either side of the Watercare intake structure, with depths recorded to +/- 0.1 m. Other available river data was obtained for the study reach including river bed information, fl ow data and dredging returns for the Waikato River. We provided a review of the relevant available information to assess trends in sediment movement around the Waikato intake since its establishment.

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