Analysis of Rainfall Seasonality Index in Iraq

Abstract

The Rainfall Seasonality Index is used to study the spatial and temporal change in rainfall behavior in that contribute in improvement of water and management plans of water resources systems and agriculture in a certain region especially during dry seasons. Rainfall date is obtained for twenty-eight weather stations in Iraq to find the seasonality index for each station. To give a clear conception of rainfall regime, the study area is divided to three zone according to amount rainfall. The results described the rainfall regime and showed that of study area is noticed at ranges (0.60-0.79), (0.80-0.99), (1.0-1.99) and (1.20<). The range (1.0-1.99) is most frequent in southern and middle regions whereas the range (0.80-0.99) is most frequent in northern zone. The results shows that has significant variation form zone to other and obviously fluctuations from year to year through the study period.