1. Environmental Engineer, Graduate Program in Civil and Environmental Engineering, Univ. of Passo Fundo, CEP 99001-970, Passo Fundo, Brazil.
2. Professor, Graduate Program in Civil and Environmental Engineering, Univ. of Passo Fundo, CEP 99001-970, Passo Fundo, Brazil.
3. Professor, Dept. of Civil and Materials Engineering, Univ. of Illinois at Chicago, 842 West Taylor St., Chicago, IL 60607.
4. Postdoctorate Student, Graduate Program in Civil and Environmental Engineering, Univ. of Passo Fundo, CEP 99001-970, Passo Fundo, Brazil.
5. Professor, Graduate Program in Civil and Environmental Engineering, Univ. of Passo Fundo, CEP 99001-970, Passo Fundo, Brazil (corresponding author).