Morgenstern, U.; Townsend, D.B.; Daughney, C.J.; Davidson, P.W. 2007 Flaxbourne catchment groundwater residence time, flow pattern, and hydrochemistry trends. Lower Hutt, N.Z.: GNS Science. GNS Science report 2007/14 49 p.
Abstract: Water demand is increasing in Marlborough province due to population growth and through increases in the area of irrigated crops. In water-short catchments like the Flaxbourne on the semi-arid East Coast, vineyard expansion is driving the demand for water. Relatively little is known about the hydrology of the Flaxbourne catchment. There is significant perennial flow in the upper catchment which subsequently becomes discontinuous in the middle reaches. The Flaxbourne River and tributaries appear only in the lowland areas. Shallow groundwater associated with the Flaxbourne River or its tributaries is used by irrigators at Ward. Resource management decisions are being made without sound understanding of sustainable limits for water allocation. Marlborough District Council requires a baseline hydrological assessment to identify sources and flow characteristics within the Flaxbourne catchment groundwater system. This information will be used to build a conceptual groundwater flow model, and eventually to guide in water allocation practice. (auth)