Groundwater resources in the Ashburton – Tinwald area are recognised to be under the twin pressures of declining water tables and rising nitrate concentrations. The Hinds/ Hekeao Managed Aquifer Recharge (MAR) Pilot project aims to replenish and improve the health of the aquifer and water quality by injecting alpine river water supplied by local water races. Lincoln Agritech was invited to support the Hinds MAR pilot trials by installing a prototype continuous nitrate monitoring system that can sample every hour in down-gradient local wells.
Lincoln Agritech’s optical nitrate sensor in-field deployment is being used to monitor the displacement of high nitrate. The nitrate sensors take hourly measurements and then transmit the data back to Lincoln; a set up that is powered by solar energy. The freshwater, low nitrate plume in the aquifer spreads out comparatively rapidly once injection has commenced; quantifying the dispersion of groundwater in real time will build an accurate picture of the effectiveness of nitrate hotspot dilution by recharge schemes, demonstrating the effectiveness of the MAR technology to the community.
Learn more about this project here: