Ephemeral gully is a transient topographic feature that links the hillslope to permanent flow channels. On the landscape, ephemeral gully often develops at the location where both surface and subsurface flow converge. There is a need to improve the assessment of ephemeral gully development in current erosion prediction technology. In this research we propose to quantify ephemeral gully erosion through three different procedures: 1) laboratory soil box study to quantify soil erodibility changes due to reemergence of subsurface flow or seepage; 2) GIS-based topographic analysis for potential surface and surface flow convergence; 3) a low-attitude digital photogrammetry technique to quantify ephemeral gully development at the hillslope. We will discuss results from these different approaches.