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Volume 18, Issue 48 (2-2007)

Total streamflow on karstic watershed comprises tow main components in which total baseflow and direct runoff. The former components include groundwater discharge basically. The later component, the direct runoff component, consists of surface runoff resulted from precipitation. Separation of main components of total streamflow on karstic watershed has been performed by "HYSEP" software on bases of Zayandeh-Roud daily streamflow data for 15 Iranian calendar years from 1360-1361 to 1374-1375 water year as a case study. This software employs three methods to compute values of above-mentioned main components separate by fixed interval method, sliding interval method and local minimum method. Comparison of results for above methods obviously shows a good agreement. So the difference of long term results (15 years) for total baseflow is always less than 2.7 %.

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