Runoff is one of the important parameters in hydrologic cycle and water resources management of
basins. In this research, Remote Sensing (RS) and Geographic Information System (GIS) techniques
were used for runoff potential estimation in Khosro-Abad watershed, located in the Hamedan region.
In this regard, first, the various thematic maps layers such as Digital Elevation Model (DEM), land
use and land cover, slope, soil hydrologic groups and sub-basins location were prepared. Then, based
on the prepared thematic layers, a weighting method was developed to runoff potential estimation of
the area. To spatial runoff variability investigating, the classifieds estimated runoff potential (low,
medium, high and extreme classes) was evaluated using the SCS method. The SCS method was
estimated based on three previous soil moisture conditions (dry, normal and wet). The results showed
that the weighting method is enable to runoff potential estimation. This method can be proposed for
runoff potential estimation especially in the cases that the needed data were missed. The results also
showed that with the previous soil moisture increasing (from dry to wet conditions), the CN increase
about 30%.