Fig. 1. Map of the Piracicaba River basin indicating the locations of the stations used for the collection of precipitation and river water samples. Precipitation collection sites are (A) Bragança, (B) Campinas, and (C) Piracicaba. River sampling sites are Bairro da Ponte (1), Morungaba (2), Desembargador Furtado (3), Fazenda da Barra (4), Paulínia (5), Usina Ester (6), Carioba (7), Copersucar (8), Recreio (9), and Artemis (10). Subbasin boundaries are marked by dotted lines.