THE INFLUENCE OF RAINFALL EVENTS AND DIFFUSE POLLUTION IN RIVERS: IMPLICATIONS FOR WATER RESOURCES MANAGEMENT INSTRUMENTS
Keywords:
Non point pollution, Quali-quantitative monitoring, Water qualityAbstract
The contributions from diffuse pollution associated with different types of land use have a great influence on the degradation of water quality in rivers. In order to achieve this goal, based on a qualitative-quantitative approach, it is intended to estimate how much polluting load is inserted into a water body during a rainfall event. The strategy was to analyze traditional water quality parameters, such as Total Nitrogen (TN), Total Phosphorus (TP), Dissolved Organic Carbon (DOC), Chemical Oxygen Demand (COD), Turbidity, Suspended Solids (SS) to assess the potential implications for water resources planning and management instruments. This research is based on an experimental watershed case study, with different characteristics of land use. For data compilation, automatic sampling was used to collect samples at two monitoring points at Barigui River, a case study highlighted. As a result, the monitoring point with greater urban influence presented greater pollution contributions than the point with a greater influence of vegetated area. In terms of SS, it is estimated an annual contribution of 116 ton/ha inserted into the aquatic ecosystem in a rainfall event that occurred after 30 days without rain. In this context, the need to reassess the legal regulations that govern water resources management instruments to consider the effects of diffuse pollution is demonstrated
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