© 2012 Sreekanth and Datta, licensee InTech. This is an open access chapter distributed under the terms of the Creative Commons Attribution License (http://creativecommons.org/licenses/by/3.0), which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. Genetic Programming: Efficient Modeling Tool in Hydrology and Groundwater Manag...