Erosivity and rainfall patterns for Pirenópolis, Goiás, Brazil

Water erosion is one of the biggest environmental problems, causing a reduction in agricultural productivity and compromising quality quantity water resources. Therefore, development researches that help planning land use management aiming at sustainable agriculture necessity state Goiás. This work was carried out with objectives analyzing annual distribution rainfall erosivity, determining factor erosivity rain (R fator) universal soil loss equation (USLE) patterns Pirenópolis - Goiás (GO). A pluviographic series from period 2002 to 2007 1986 2014 were used. Data analyzed completely randomized design 7 (months) x 3 (patterns) factorial scheme. Through results, it possible verify that: erosive potential concentrated between months October April, corresponding 94.2% average index EI30. The R USLE for locality GO 7,799.5 MJ mm ha-1 h-1 year-1, 130.2 KE> 25. advanced hydrological pattern most frequent among precipitations, followed by delayed intermediate patterns. According analysis, presents higher values individual precipitation events November, December April.