Evaluation of spatial and temporal variation ground water level in Kermanshah plain

Investigate variation of groundwater resource is very important in planning and sustainable management of water resource in each region. Quantitative and qualitative properties of ground water are changed in spatial and temporal scales; therefore it con not presumed fixed these properties. The goal of this study was investigate temporal and spatial variation ground water level in Kermanshah plain in annual، season and month in a 20 years period from 1991 to 2011 by using groundwater data of 61 piezometric wells. After was controlling of quality، accuracy and normality of data and Reconstruction of the statistical deficiencies، we used Kriging interpolation method for zoning variation of annual، season، and month، As well as Thiesson Polygon Method was used for variation of average height of piezometric level in Kermanshah plain. The diagram of height variation of piezometric level in each wells showed that preference of interpolation method compare to Thiesson Polygon Method. Assessment of results showed that average height of table groundwater during statistical period was felled 9. 9 meter (0. 49m in year)، whereas fall variation in some of wells showed fall is upper 30m.