1. Doctoral student, Dept. of Hydraulics and Sanitary Engineering, Univ. of São Paulo, Av. Trabalhador Sãocarlense, 400. CEP 13566-590, São Carlos, São Paulo, Brazil (corresponding author).
2. Professor, Dept. of Hydraulics and Sanitary Engineering, Univ. of São Paulo, Av. Trabalhador Sãocarlense, 400. CEP 13566-590, São Carlos, São Paulo, Brazil.