POINT AND NON-POINT POLLUTION: MANAGING THEM IN THE WATERSHED

Código

XXVI-SBRH1207

Autores

Lais Ferrer Amorim de Oliveira, Ariel Ali Bento Magalhães, José Rodolfo Scarati Martins, Barbara Pozzan dos Santos Duarte

Tema

STE095 - Engenharia Limnológica e Mecânica dos Fluidos Ambiental

Resumo

Reservoirs are fundamental to the water supply, and high levels of incoming load can lead to eutrophic environments and algal blooms, compromising water quality and use. The decontamination of water bodies depends on controlling the input load. This article aims to demonstrate a new approach to pollutant load modelling techniques, improving watershed management, and highlighting the separate roles of point and non-point pollution. A hydrological and load model was applied to describe watershed flow and load production. The developed tool showed good performance, providing flow throughout the year, and separating it into total flow, superficial flow, and base flow. Related to the incoming load, the model was able to describe the BOD, Total Phosphorus, and Total Nitrogen concentrations, showing that the dry season accumulates pollutants and elevates concentrations, whereas in the wet season, washes them off and decreases pollutant concentrations, like January 2022. Allied with load model coefficients, EMC values for BOD and TP are like previous work, but for TN values are 3 times higher. Regarding the wash-off parameter, the nonpoint pollution has multiple sources for each constituent. As a result, the reservoir has a trophic state that varies from Eutrophic to Hypereutrophic. This research demonstrates that effective basin management is essential for water bodies. Therefore, it's crucial to remove nutrients from sewage and manage agricultural land effectively.