Investigation of groundwater in the Upper Motueka River catchment

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SR_2003-032-pdf
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Stewart, M.K.; Hong, Y.S.; Cameron, S.G.; Daughney, C.J.; Tait, T.; Thomas, J.T. 2005 Investigation of groundwater in the Upper Motueka River catchment . Lower Hutt: Institute of Geological & Nuclear Sciences. Institute of Geological & Nuclear Sciences science report 2003/32 47 p.

Abstract: Groundwater investigation in the Upper Motueka catchment is a key end user-driven component of the Integrated Catchment Management (ICM) project, a six year programme which commenced in July 2000. The goal of the ICM project is to conduct multi-disciplinary, multi-stakeholder research to provide information and knowledge that will improve the management of land, freshwater, and near-coastal environments in catchments with multiple, interacting, and potentially conflicting land uses. The principal aims of the investigations are to understand the hydrogeology of the Upper Motueka valley (including parts of the Motupiko and Tadmor valleys), the aquifer hydraulic properties, the occurrence of groundwater (recharge, storage and discharge), and the connectivity to the rivers. Understanding these will give a conceptual model of the river/groundwater system to constrain computational models. The study area lies within the Moutere Depression at lower altitude and has moderate rainfall (900-1300 mm). Higher land to the east with rainfall up to 2000 mm feeds the upper reaches of the Motueka River. Comparison of the Motueka River flow at the gorge and upstream of the Wangapeka River confluence shows that much of the flow, and particularly much of the low flow, are generated within the comparatively small gorge headwater area, comprising ultramafics and Maitai Group sediments. Below the gorge, the catchment contains Moutere Gravel. The Motupiko and Tadmor catchments are predominantly Moutere Gravel. (auth)