An Analysis of Synthetic Unit Hydrograph and Its Comparison with Natural Hydrograph: A Case Study of Catchment Basin of Dehbala, Yazd Province, Iran

The relationship between rainfall and runoff plays an important role in the hydrological studies of watershed. In this study, an attempt was made to use the dimensionless hydrograph, which was used in the basins with no statistical data, for a comparative watershed study in Dehbala. These models are as follows: Schneider unit hydrograph models, SCS and triangular model. Due to the unavailability of accurate statistics, a flood event was used in Dehbala. The comparison of three methods of synthetic unit hydrograph with the natural one was indicative of the better coordination of the Schneider procedure for estimation of the observed hydrograph. Moreover, the highest peak of the lowest motion error is related to the SCS method. Among those methods, unit hydrograph needs the least amount of time to reach peak flow error is observed in Schneider method and the maximum error in time is related to the triangular method. The least degree of conformity is observed in the triangular and SCS methods However, Schneider is in good agreement with the observed hydrograph.