The Lagunas Norte mine, operated by Barrick Misquichilca S.A., is an open pit gold mine located in the Quiruvilca district, Santiago de Chuco province, La Libertad department, Perú. The main study objective is to evaluate the volume of effluent discharge at each gauging station. To meet this objective, a control section was defined through the flow structure and flow measurements obtained to develop a head flow discharge (H-Q) curve. Tierra Group’s Team records flow and water levels through each structure bi-monthly, processes the information and provides reports to Barrick.