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Predicting river fows in basins where limited data is available is a challenge facing many hydrologists es-pecially in developing countries. In this study, the Pitman monthly model was applied to generate fows for the Lhasa basin in China (Tibet). As fow data was unavailable for the Lhasa basin, the model was frst calibrated for the upper Koshi Basin in Nepal and China. The Pitman model successfully predicted fows for the upper Koshi basin (R 2 =0.88). Therefore, the estimated model parameters from the Koshi basin as well as climate data from the Lhasa basin were used to generate fows for the Lhasa basin outlet. The main modeling assumption is that the basin characteristics of the upper Koshi are similar to that of the Lhasa basin. Under present circumstances, where measured data is unavail-able, the model estimated monthly fows for the Lhasa basin can be used in further studies in basin water accounting and management. Key words: Un-gauged basins; Pitman monthly model; Stream fow generation; Lhasa basin (Tibet); Koshi basin (Nepal) DOI: 10.3126/hn.v7i0.4233 Hydro Nepal Journal of Water, Energy and Environment Vol 7, July, 2010 Page: 30-34 Uploaded date: 31 January, 2011

Application of the Pitman Model to Generate Discharges for the Lhasa Basin, China