Application of statistical and geostatistical approaches in temporal and spatial estimations of rainfall

Abstract This study is the first that worked on temporal and spatial distributions of annual rainfall (Pyear) maximum 24-h (Pmax24h) in Semnan province. For this purpose, different statistical were used to estimate Pyear Pmax24h Six synoptic stations across province studied all had complete data. Different return periods studied. The goodness fit test for showed about 67% follow Generalized Pareto (GP) distribution. Considering Pmax24h, 50% GP distribution, ratio Pyear, Extreme Value (GEV) distribution periods, by moving southeast province, precipitation amounts decreased. While toward Shahmirzad station, increased. Also, there was a logical relationship between Pmax24h. Consequently, minimum value R2 coefficient equal 0.992 0.980, respectively.