Statistical Analysis of Rainfall Trends in Balochistan and Sindh.

Frequency analysis of regional rainfall is very important in the design of the civil structure as well as the nonstructural problem. In the present study an attempt has been made to find out the best fitted distribution(s) to enlighten the rainfall trends in Balochistan and Sindh. The secondary data is obtained from Pakistan metrological department for the period 1980 to 2015. Firstly, we have checked the basic assumption such as randomness and identically of distribution of the observed data series by using Run test and Mann Whitney test. Further, three parameter distributions named as Generalized extreme value, Weibull and Frechet three parameters distributions, and compared with two parameters Weibull, Frechet and Log logistic distributions. The parameters of the three and two parameters candidate distributions were obtained by using maximum likelihood and probability weighted moment methods. The performances of the candidate distributions were checked out by using Kolmogorov Smirnove test at 5 percent level of significance. Moreover, probability density functions graphs were used to indorse the behavior and the theoretical framework of the rainfall distributions of selected sites. Furthermore, quantiles were estimated for future prediction. The resultant estimates depicted that two parameters distributions and three parameters distributions were the most appropriate for annual maximum rainfall series. [ABSTRACT FROM AUTHOR]