EQUACOES DE INTENSIDADE DE CHUVAS PARA O ESTADO DO MARANHAO/RAINFALL INTENSITY EQUATIONS FOR THE STATE OF MARANHAO, BRAZIL

• Published in: Engenharia na agricultura Vol. 23; no. 5; p. 435
• Main Authors: Campos, Alcinei Ribeiro, Santos, Glenio Guimaraes, dos Anjos, Joao Carlos Rocha, Zamboni, Diane Cristina Stefanoski, Moraes, Jaurene Moura Fe
• Format: Journal Article
• Language: English
• Published: 01-09-2015
• Subjects: Adjustment; Computational fluid dynamics; Fluid flow; Hydraulics; Mathematical analysis; Mathematical models; Rainfall
• ISSN: 1414-3984; 1414-3984

Studies of spatial and temporal distribution of rainfall are of extreme importance for security in planning and execution of hydraulic projects and environmental conservation, so work to determine the intensity-duration-frequency curves of rainfall are indispensable for the planning and construction of hydraulic works. In this context the objective of this work was to determine the parameters of the intensity-duration-frequency equation for 163 rainfall stations located in the state of Maranhao. Data were obtained from the National Water Agency database. For adjustment of intensity-duration-frequency curves the rainfall breakdown method was used, considering the probabilistic model of Gumbel for estimating the maximum values in different time durations and return period. Upon acquisition of these values the parameters K, a, b and c of the intensity-duration-frequency curves were adjusted by the least squares method. The parameters K, a, b and c of the intensity-duration-frequency curves show good adjust, with 99.7% of curves presenting r2 greater than 0.98.