Sources of nitrogen and phosphorus in two major catchments in the Waikato region, 2011–20

Report: TR 2022/05

Authors: B Vant

This report uses water quality and flow data from the routine monitoring of the Waikato and Waipā rivers and the consented discharges to determine the loads of the plant nutrients nitrogen and phosphorus in the rivers and discharges, and thereby establish the relative importance of the different sources of these nutrients. In doing so it updates previous analyses of these records for the decade 2011–20. 

The report is divided into two sections, with Section 1 dealing with the loads carried by the Waikato and Waipā Rivers and Section 2 dealing with the loads carried by the Hauraki rivers.