A preliminary account of the groundwater resources of the Wairau Plains, Marlborough

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Brown, L.J. 1972 A preliminary account of the groundwater resources of the Wairau Plains, Marlborough. Lower Hutt: New Zealand Geological Survey. Report NZGS 60 60 p.

Abstract: The Wairau River is 105 miles (169 km) long and drains an area of 1,630 square miles (4220 sq km) (see Fig. 1). From Tophouse to the Waihopai River alluvium and glacial outwash material have been deposited in a fault angle depression to form the floor of the Wairau Valley. From the Waihopai River junction to the coast, the Wairau Plains are from 5 to 7 miles (8 to 11 km) wide. Blenheim, the provincial capital of Marlborough, is located about 5 miles (8km) inland on the Wairau Plains. Ground water from wells in glacial outwash and alluvial deposits provides sufficient water for domestic supplies, irrigation, and a town water supply for Blenheim. In 1964 the New Zealand Geological Survey began investigations into the ground-water resources of Marlborough with the main emphasis on the Wairau plains. The investigations were designed to determine the availability of ground water, its relation to rainfall and river influence, and to evolve a programme of future investigations for the Marlborough Catchment Board, the Regional Water Authority for the area.