Water Quality and Sediment Behaviour of the Future: Predictions for the
21st Century (Proceedings of Symposium HS2005 at IUGG2007, Perugia, July
2007). IAHS Publ. 314, 2007, 213-216
Flood flow water
quality analysis using low-cost samplers in small rivers
JANAÍNA
BEZERRA MESQUITA LIMA1 & SÉRGIO KOIDE2
1 SHIN CA8, LT.03, casa 16, Lago Norte,
71.503-508 Brasilia, DF, Brazil
janaina.mesquita@anvisa.gov.br
2 University of Brasilia, Department of Civil and Environmental
Engineering, 70.910-900 Brasilia, DF, Brazil
Abstract Water quality studies require field data for assessment and mathematical simulation. Manual collection of water samples during floods in small rivers is very difficult due to the short event duration and quick response to rainfall. Some low cost siphon samplers presented in the literature have been developed and adapted to collect event-based samples, but they only collect samples when the stream stage is rising. This work presents a new design of a low cost siphon sampler developed to allow collection when the stream stage is decreasing. It was tested in the laboratory and also installed in a river with flood flows strongly dominated by urban runoff. The major problem faced in the field work was to keep the samplers in place due to the amount of debris carried by the floods. Laboratory tests showed water intrusion into the sampler during the rising stage and further improvement is proposed to solve the problem.
Key
words low cost sampler; water quality sampling;
sampler