1. Assistant Professor, Computer Science Dept., Pontificia Univ. Católica de Chile, Casilla 306, Correo 22, Santiago, Chile (corresponding author). E-mail: marcos@ing.puc.cl
2. Masters Student, Dept. of Hydraulics and Environmental Engineering, Pontificia Univ. Católica de Chile, Casilla 306, Correo 22, Santiago, Chile.
3. Assistant Professor, Dept. of Hydraulics and Environmental Engineering, Pontificia Univ. Católica de Chile, Casilla 306, Correo 22, Santiago, Chile.