s Gerami - Graduated Student, Department of Civil Engineering, Birjand University,
a Akbar poor - Assistant Professor, Department of Civil Engineering, Birjand University
M.R Doosti - Assistant Professor, Department of Civil Engineering, Birjand University
m Raji

The spatial distribution and seasonal variation of Cl-, Ca+2, EC, Mg+2, Na+, NO3-, SO4-2, TDS, HCO3-, Alkalinity, and Total Hardness were obtained by surveying 25 sampling stations in 2009 and 2010. All the parameters were analyzed by standard methods and spatial distribution maps drown using Arc GIS 9.3 and GS+5.1 softwares using kriging method. In the present study an attempt has been made to evaluate the variation of the contaminated parameters in the different seasons and years with the help of normalized scatter coefficient formula which for EC, Mg+ Ca+2, 2 NO3-, SO4-2, HCO3-, Alkalinity, and Total Hardness show consistent increase form 2009 to 2010 while there is a general decrease in Cl-, TDS, Na+ concentrations. The results of the study showed in 2009 and 2010 with passing the time from cold seasons to warm seasons the contaminated parameters EC, TDS ,Cl-, Na+ are seen to be increasing throughout the ground water.

Qaenat, ground water, spatial maps, seasonal variation