Zarnott, Daiane Hellnvig creator Tavares, Vitor Emanuel Quevedo creator Giardina, Christian creator Alba, José Maria Filippini creator text periodical abstract or summary bl. continuing eng Abstract This study aims to estimate the effect of different land uses around watercourses on runoff following extreme precipitation events and, consequently, on the mitigation of these effects. The study area is a rural watershed in the state of Rio Grande do Sul, Brazil. After characterizing the area, we estimated the surface runoff of the January 2009 precipitation event, which caused two casualties: losses in soil and productive area, as well as over US$ 300,000.00 in damages to the water supply system. Subsequently, simulations were performed considering different land uses and riparian areas under different precipitation levels. The results indicate that conserving riparian forests in the surroundings of watercourses decreases direct surface runoff, whereas intense soil use in these areas favors runoff increase. Keywords: conservation, forest hydrology, watershed management. Publicação on-line; 29 ref.; 2 tables; 8 illus.; Summary (En) USO DA TERRA CONSERVAÇÃO HIDROLOGIA FLORESTA BACIA HIDROGRÁFICA Rio de Janeiro-RJ Instituto de Florestas - UFRRJ 1994 2025-0458 1415-0980 / ISSN 2179-8087 0nline BR2026001890 v. 27(4) p. 1-9; (2020) https://www.scielo.br/j/floram/a/q4dmbyPDQH5WvGhmrWYx7pF/?format=pdf&lang=en https://www.scielo.br/j/floram/a/q4dmbyPDQH5WvGhmrWYx7pF/?format=pdf&lang=en BR-BrBNA 260610 20260610094405.0 eng