Application of geostastical methods for determining annualprecipitation in Karoon and Dez basins

Prediction of annual average precipitation over a regin is one of important issues in watersherd management andnatural resources planning. Geostatistics is one of the useful methods for precipitation prediction which varies basedon type of the variable. This study was conducted in Karoon and Dez Basins located in southwertern of Iran. The dataset including 20 years of annual precipitation of stations were used. At first normality and homogeneity of data examined. Then variographic analysis using three techniques including kriging, co-krigining and Weighted Moving Average (WMA) were applied for predicting annual precipitation. Finally compaction of the results using statistical techniques showed that kinging method has the highest accuracy and provides more accentuate results.