Abstract
This study was aimed to demonstrate screening of the rainfall data for water resources applications, Bahawalnagar station in Pakistan was selected as the case study. The ultimate goal of this study was to test the rainfall record for stability, trends, consistency and homogeneity for its further utilization. The rainfall data were collected from the Meteorological Department of Pakistan for a period of 31 years ( 1962 to 1992) on 3-hourly basis. The missing for four years ( 1965, 1968, 1975 and 1978) were estimated by normal ratio method, taking into account the three surrounding stations namely Multan, Bahawalpur and Khanpur. Annual maximum moving rainfall totals for 3, 6, 12, 24, 48 and 96 hours were calculated to construct six series of rainfall data. Various standard procedures were applied to test the consistency, homogeneity and stability of rainfall series. F and t tests were employed to test the stability of variances and means of rainfall series. The results revealed that data were stable, trendless and homogenous. The results from double mass analysis indicated that the rainfall records at Bahawalnagar and three surrounding stations were consistent relative to each other. The data were thus declared objectionless for further use for frequency analysis.
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