Statistical analysis of rainfall trend for the nari river basin of balochistan

Climatic variability for a region is referred to prolonged modification in precipitation, humidity, temperature, wind, evaporation and other parameters of metrology. Quantification of climate variability is essential to identify the change that has already occurred, as this will not only assist to make prediction but also lead to a better preparedness for natural disasters. The purpose of the present study was to examine the variability in rainfall occurred in the Nari River Basin of Balochistan, Pakistan from 1962 to 1993 by analyzing monthly and yearly precipitation data of 12 stations. The variability in monthly trends of the zones was represented through graph. Analysis of variance technique was used to determine any significant difference among the three sub-basins of both North and South zone of the basin. Significant differences were observed among the three sub-basins of both zones. Highest monthly precipitation recorded was 250.2 inches in the Northern zone and lowest 19.3 inches in the South zone. Linear regression analysis revealed no statistically significant trend for yearly and monthly rainfall data in both zones. The Mann-Kendall test revealed a statistically significant upward trend in some months in the South zone.