Runoff process on a steep forested slope

Abstract Three slope units are defined by combining nine basic slope types. A convergent slope unit is called a zero-order basin, because it combines a slope and a stream. Field measurements of the runoff process of stormflow on Pliocene slopes are presented. Pipe flow and saturated overland flow play an important part on convergent colluvial slope units. Surface soils significantly influence saturated throughflow on creeping middle slopes. The depth of weathering has a major effect on initial moisture storage for residual and creeping slopes. A subsurface storm flow pattern on a typical Pliocene slope is reconstructed based on the field measurements.