fatemeh karandish - ph.D.candidate in tarbiat modares university
kyoumars ebrahimi - professor, faculty of agriculture university of tehran
jahangir porhemmat - professor soil conservation and watershedo management research institute

Rainfall spatial distribution is one of the most important factors in rainfall - runoff models. Application of an improper spatial distribution method can create errors in water budget estimation. Many methods are practical rainfall special distribution because it considered the location of a data points in conjunction to its value. Inthis study , we examine four interpolation methods including weighted moving average WMA,thin plate smoothing splines TPSS, and two kriging variants for extimating daily rainfall distribution in the karoon basin till the shaloo outlet.

cokriging , daily precipitation, Geostatistics, karoon basin kriging, TPSS,WMA