Abstract
In present study Tawi River was selected for low flow frequency analysis (LFFA). Tawi River is left bank tributary of Chenab River. LFFA is useful to measure various parameters as mean annual runoff (MAR); mean daily flow (MDF), Q20, Q50, Q90, Q20/Q90, Q50/Q90, Q90/Q50; the average of annual series of minimum ten-day average (MAM10); and the average of annual series of minimum seven-day average (MAM7), 10Q10, 10Q2, 7Q10 and 7Q2. By separating, the 40 years discharge data in 20-20 years' time period, significant change is observed; 15% change observed in MCM, 12.97% change in Q20 and 12.32% change in Q50. Flow duration curves show significant change in discharge of the Tawi River particularly during 5-25% exceedance probability. Monthly discharges show mixed trends with increase in discharges as 42.68%, 81.47% and 42.91% during October, November and June months and decrease in discharges as 13% to 48% during January, March, April, July, August, and December.
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