University of Tabriz Water and Soil Science 2008-5133 21 3 2011 11 22 Tank Model Application to Derive Unit Hydrographs of Quick and Slow Runoff for Rainfall- Runoff Process (Case Study: Navrood Basin, Iran) Tank Model Application to Derive Unit Hydrographs of Quick and Slow Runoff for Rainfall- Runoff Process (Case Study: Navrood Basin, Iran) 23 35 1197 FA E Asady A Fakheri Fard MA Ghorbani Journal Article 2014 04 23       In several types of rainfall-runoff models, the unit hydrograph based methods are useful tools for flood estimation in many, except non-gauged, basins. In this study, unit pulse response functions (quick and slow runoff) derived, considering linear system theory concept and using tank conceptual model. The model parameters were estimated with direct search optimization method. The model applicability and validity were verified using observed rainfall-runoff data of Navrood basin in Gillan province. The results showed that the tank model could simulate rainfall-runoff process with acceptable precision by taking into account the antecedent soil moisture conditions and without need to define excess rainfall. ا       In several types of rainfall-runoff models, the unit hydrograph based methods are useful tools for flood estimation in many, except non-gauged, basins. In this study, unit pulse response functions (quick and slow runoff) derived, considering linear system theory concept and using tank conceptual model. The model parameters were estimated with direct search optimization method. The model applicability and validity were verified using observed rainfall-runoff data of Navrood basin in Gillan province. The results showed that the tank model could simulate rainfall-runoff process with acceptable precision by taking into account the antecedent soil moisture conditions and without need to define excess rainfall. ا https://water-soil.tabrizu.ac.ir/article_1197_cb73aa005679171ae04aab53ba9796cf.pdf