Trends of extreme flows of Krishna river at a barrage, India

Abstract

In the present study, trends of extreme flows for the Krishna river at Prakasam barrage, Vijayawada of Andhra Pradesh state, India, are analyzed. Annual maximum and minimum flows are considered using available data from CWC [Central Water Commission] portal from the year 1965-66 to 2019-20. Trend analysis of extreme flows are carried using Mann-Kendall trend test, Sen's slope, and modified Mann-Kendall test i.e. bootstrapped Mann-Kendall trend test with optional bias corrected pre-whitening. Also, R programming is applied for trend analysis of extreme flows. It is found that annual extreme flows are in decreasing trend. Annual maximum flow is having significant decreasing trend with Sen's slope of 105.52 cumecs per year. Annual minimum flow is having insignificant decreasing trend at a magnitude of 0.0002 cumecs per year. Trend results of present study are useful for trend analysis of extreme river flows.