Relation Among Intensity, Duration And Frequency Of Rainfall In Mococa, State Of São Paulo, Brazil [relação Entre Intensidade, Duração E Freqüência De Chuvas Em Mococa, Sp]

The objective of this work was to perform a statistical analysis of rainfall data gathered in Mococa, State of São Paulo, from 1970 to 1990, including the relationship between intensity, duration and frequency. The studied data were registered with a rain gauge located at the Experimental Station of the Institute Agronômico, in Mococa, São Paulo State, Brazil. The relationship were studied for the following duration intervals: 5, 10, 15, 25, 30, 45, 60, 90, and 120 minutes. The Chow-Gumbel method was applied for the study of frequency distribution of intense precipitation for recurrency times of 5, 10, 25, 50, and 100 years. Also, the method of minimum squares was applied to obtain an equation for the same relationship. Final results showed good correlation between both methods, as well as with the maximum rainfall values obtained for each duration, resulting in linear regression coefficients of 0.9990 and 0.9920, respectively. Results indicated that the equation can be utilized for cases where values of maximum rainfall intensities are needed.33812151220Chow, V.T., Frequency of hydrologic data with special application to rainfall intensities (1953) University of Illinois Bulletin, pp. 50-81Eltz, F.L., Reichert, J.M., Cassol, E.A., Período de retorno de chuvas em Santa Maria, RS (1992) Revista Brasileira de Ciência do Solo, 16, pp. 265-269. , CampinasGarcez, L.N., (1967) Hidrologia, 249p. , São Paulo: Edgard Blücher/ Universidade de São PauloOcchipinti, A.G., Santos, P.M., (1965) Análise Intensida-de-duração-frequência de Chuva na Cidade de São Paulo, 40p. , São Paulo: USP-Instituto Astronômico e GeofísicoVieira, D.B., Lombardi Neto, F., Santos, R.P., Análise das máximas intensidades de chuva em Pindorama, SP (1994) Revista Brasileira de Ciência do Solo, 18, pp. 255-260. , CampinasZullo Jr., J., Arruda, F.B., (1986) Programa Computacional para Ajuste de Equações em Dados Experimentais, 23p. , Campinas: Instituto Agronômico, (IAC. Boletim técnico, n.113