A Study of Discharge Estimation Using Justin's Method and Comparison with Experimental Methods (Case study: The Central Alborz Sub-Basins)

Determining of discharge and the height of the run-off are considered to be the most basic hydrological elements of a basin in relation to the flooding of the basin, so that whenever the intensity of rainfall is greater than the capacity of water infiltration into the soil, the surface runoff flows over the basin and considering that The physiographic features of the basin are relatively stable, a direct relationship can be established between precipitation and runoff. Therefore, in this research, using physiographic and precipitation data, the amount of runoff in the central the Alborz sub-basins is investigated using the methods of Justin, Ikar, Ketain, England, Vermuel and Khozala. The results show that it is possible to determine the difference between Run-off by Justin's method and other mentioned methods gave a power relationship and a linear relationship between precipitation and runoff in different methods, that the estimation of runoff using Ikar's method has RMSE=0.0506, which is very close to Justin's method.