1. Al-Qinna M, Salahat M, Shatnawi Z (2008) Effects of carbonates and gravel contents on hydraulic properties in gravely-calcareous soils Dirasat. Agric Sci 35(3):145–158
2. Clark I (1984) Practical geostatistics. Elsevier, New York
3. Clesceri L, Greenberg A, Eaton A (1998) Standard methods for the examination of water and wastewater, 20th edn. American Public Health Association, Washington, DC
4. Davis J (1986) Statistics and data analysis in geology. Wiley, New York
5. Department of Statistics (DOS) (2007) Estimation of population by Governorate. Department of statistics, Amman, Jordan ( http://www.dos.gov.jo/sdb_pop_e/ehsaat/alsokan/1_2003.htm,02/04/2007 )