Halil Karahan received a BSc degree from the Department of Civil Engineering at Cukurova University, Adana, Turkey, in 1979, and MSc and PhD degrees from the Institute of Science and Technology at Dokuz Eylul University in 1984 and 1988, respectively. He has been lecturing in the Department of Civil Engineering at Pamukkale University since 1992. His research interests include hydrodynamic and groundwater modeling and parameter estimation with neural networks, genetic algorithm, and spreadsheet modeling. He has published many national and international scientific papers. He has also been involved with many international irrigation and drainage projects.