Acknowledgements
The authors are deeply thankful to Scientific Research Support Fund (SRSF), Ministry of Higher Education and Scientific Research, Jordan, for their financial support to accomplish this project under the no. (H/6/02/2008). The authors are also thankful to Mr. Awni Shaker, for his help in producing the GIS maps. Our thanks also go to Royal Jordanian Geographic Center (RJGC) for supporting us with digital maps used in GIS software.