Water quality has been a global concern, as evidenced by UN Sustainable Development Goals. The current paper has focused on the Piabanha River rehabilitation as a case study which can be generalized to other similar watersheds. A monitoring program during a hydrological year was carried out, and different databases were used to calibrate and validate the QUAL-UFMG water quality model. Sanitation is the major problem in the watershed, notably in its headwater catchments, which concentrate the most urbanized regions where water quality is worse in the dry season due to low river flows. Thus, simulations of the river water quality have been performed through computational modeling suggesting organic load reductions in some sub-basins. In conclusion, some strategies to improve water quality have been discussed: (i) The water quality rehabilitation must consider progressive goals of pollution reduction starting with an initial implementation in a reduced area. The monitoring should be based on a few parameters relevant and simple to monitor. (ii) Pollution reduction ought to be carried out strategically with deadlines and intermediate goals that must be agreed upon between the stakeholders in the watershed. (iii) Watershed committees should supervise projects to improve water quality in partnership with the State Prosecutor’s Office.

中文翻译：

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从监测和建模到管理：如何改善巴西河流的水质？案例研究：Piabanha河流域

正如联合国可持续发展目标所证明的那样，水质一直是全球关注的问题。本文以案例研究为重点，将Piabanha河的修复工作推广到其他类似的流域。在水文年期间执行了一项监测计划，并使用了不同的数据库来校准和验证QUAL-UFMG水质模型。卫生是流域的主要问题，特别是在流域，流域集中在大多数城市化地区，在这些地区，由于河流流量低，旱季的水质较差。因此，通过计算模型对河流水质进行了模拟，结果表明某些子流域的有机负荷降低。总之，讨论了一些改善水质的策略：（i）水质恢复必须考虑从减少地区的初步实施开始的逐步减少污染的目标。监视应基于一些相关且易于监视的参数。（ii）减少污染应在战略上进行，必须在截止日期和中间目标之间达成分水岭的利益相关者之间的共识。（iii）流域委员会应与国家检察官办公室合作监督改善水质的项目。（ii）减少污染应在战略上进行，必须在截止日期和中间目标之间达成分水岭的利益相关者之间的共识。（iii）流域委员会应与国家检察官办公室合作监督改善水质的项目。（ii）减少污染应在战略上进行，必须在截止日期和中间目标之间达成分水岭的利益相关者之间的共识。（iii）流域委员会应与国家检察官办公室合作监督改善水质的项目。