Assessment of nitrogen flow pathways and its potential attenuation in shallow groundwaters in the Lower Rangitikei catchment

Content Partner: Lincoln University. We assessed surface water and groundwater interactions, and nitrogen flow and its potential attenuation in shallow groundwater in the lower Rangitikei catchment. The study area covers about 850 km² between the townships of Bulls and Sanson in the east, Tangimoana...

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Bibliographic Details
Main Authors: Collins, S, Singh, R, Rivas, Aldrin, Palmer, A, Horne, D, Roygard, J, Matthews, A
Format: Article
Language:English
Online Access:Request full text
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Summary:Content Partner: Lincoln University. We assessed surface water and groundwater interactions, and nitrogen flow and its potential attenuation in shallow groundwater in the lower Rangitikei catchment. The study area covers about 850 km² between the townships of Bulls and Sanson in the east, Tangimoana in the south and Santoft in the north. A piezometric map, developed from measured depths to groundwater in about 100 wells in October 2014, suggests that groundwater flow, in particular the shallow groundwater (30 m) showed relatively less topographic influence. Groundwater discharges to the river upstream and downstream of Bulls, while groundwater recharge or no interaction with the river is more likely to occur near the coast. The groundwater redox characterisation, based on sampling and analysis of 15 groundwater wells, suggests that in general the groundwater across the lower Rangitikei catchment is under anoxic/reduced conditions. The groundwater typically has low dissolved oxygen concentrations (