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Power of non-parametric Mann-Kendall test and Spearman’s Rho test is highly influenced by serially correlated data. To address this issue, trend tests may be applied on the modified versions of the time series data by Block Bootstrapping (BBS), Prewhitening (PW) , Trend Free Prewhitening (TFPW), Bias Corrected Prewhitening and Variance Correction Approach by calculating effective sample size. Mann, H. B. (1945).doi:10.1017/CBO9781107415324.004. Kendall, M. (1975). Multivariate analysis. Charles Griffin&Company Ltd,. sen, P. K. (1968).doi:10.2307/2285891. Önöz, B., & Bayazit, M. (2012) doi:10.1002/hyp.8438. Hamed, K. H. (2009).doi:10.1016/j.jhydrol.2009.01.040. Yue, S., & Wang, C. Y. (2002) doi:10.1029/2001WR000861. Yue, S., Pilon, P., Phinney, B., & Cavadias, G. (2002) doi:10.1002/hyp.1095. Hamed, K. H., & Ramachandra Rao, A. (1998) doi:10.1016/S0022-1694(97)00125-X. Yue, S., & Wang, C. Y. (2004) doi:10.1023/B:WARM.0000043140.61082.60.