Relationship between hydrologic and geomorphologic parameters, can lead to estimate hydrologic response of basins and is applied to the similar areas, in terms of geomorphology, that are ungauged. In this context, several methods have been proposed. This study has been compared the consistency, accuracy and reliability of geomorphologic, geomorphoclimatic and rosso instantaneous unit hydrographs
... [Show full abstract] and SCS unit hydrograph, in estimating outlet runoff hydrograph characteristics in Manshad watershed. Comparisons of calculated and observed hydrographs, that have been carried out by using the Mean Relative Error, the Root Mean Square Error and the Nash-Sutcliffe indices, confirm the high potential of all the methods, in simulating the amount of flood volume (with error of less than 12%). Thus, they can be used, as appropriate methods, for simulating this parameter in similar catchments. In estimating peak discharge, Geomorphologic and Rosso IUH (respectively with error of 39.03% and 42.35% ) have better performances, comparing to other methods. They have weak performances in simulating time to peak and the shape of hydrograph. Also, Geomorphoclimatic and SCS methods have weak performances in estimating peak discharge, time to peak and the shape of hydrographs.
