Groundwater nutrient movement : Inchbonnie catchment

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Zemansky, G.M.; Horrox, J. 2007 Groundwater nutrient movement : Inchbonnie catchment. Lower Hutt, N.Z.: GNS Science. GNS Science report 2007/35 70 p.

Abstract: Lake Brunner has high natural and human use values which are at risk from development pressures. Increases in nutrient concentrations in the lake have been noted over the last 15 years. Data regarding nutrient inputs via surface streams have been developed by NIWA but little is known about the associated groundwater pathway. Surface stream data indicates that nutrient inputs are related to major land uses within stream catchments. This report provides the first information on nutrient movement in groundwater in the Lake Brunner area. This research focussed on the Inchbonnie catchment on the south side of Lake Brunner and consisted of one year of monitoring data. Major ions and a selection of different forms of nitrogen and phosphorus were measured. Dairy farming is the major activity within the Inch bonnie catchment. This research was conducted in conjunction with the West Coast Regional council and in cooperation with NIWA. (auth)