1. Department of Civil and Environmental Engineering; Federal University of Paraíba; João Pessoa PB 58041-060 Brazil
2. Institute for Technologies in the Tropics; Cologne University of Applied Sciences; Cologne 50679 Germany
3. Department of Hydraulics and Sanitary Engineering; University of São Paulo; Av. Trabalhador Sancarlense 400 São Carlos SP 13566-590 Brazil