1. Professor, School of Civil Engineering, Univ. of Tehran, Tehran, Iran; and Research Professor, Polytechnic Institute of NYU, Brooklyn, NY 11201 (corresponding author)., and
2. Staff Engineer, Water and Wastewater Planning Bureau, Ministry of Energy, Tehran, Iran.
3. Assistant Professor, Dept. of Civil Engineering, Isfahan Univ. of Technology, Isfahan, Iran; formerly, School of Civil Engineering, Univ. of Tehran, Tehran, Iran.