Water quality and pollution by hazardous substances of a small lowland stream under different hydrological conditions

This study investigates water quality and hazardous substances toxic to aquatic life in a small lowland stream under different hydrological conditions. The objective was to explore links among hydrology, water chemistry and microbial contamination in a stream predominantly impacted by structural degradation of stream morphology (channelization and straightening), agricultural land use in the catchment, and by a high load of treated wastewater. Sampling was carried out during spring high (HWL, > 200 cm), summer low (LWL