Stream flow measurements were recorded in two gauges
located at sites A and B by the Catalan Water Agency (ACA, 2012).
We assumed wastewater treatment plant (WWTP) effluents were
equivalent to the recorded WWTP inflows. Conductivity, pH and
water temperature data were determined in the field for each
sample. Precipitation data were acquired from the Catalan Meteorological
Institute (Meteocat, 2014). Data from seasonal river flow,
precipitation and temperature is shown in the Supplementary
Material (S1).