By the continuous measurement of stream conductance and discharge for a long snowmelt period, the runoff components were separated and the dominancy of subsurface flow was confirmed as found in the previous paper on stream temperature analyses. A plot of conductance versus discharge gave a shift between rising limbs and falling limbs of a diurnal hydrograph and the shift was inversed after a snow-free area emerged adjacent to stream channels; and the shift corresponded to the change of the peak lag of the runoff components. The results provided important information for discussing and reinforcing the variable source-area concept on the runoff process in headwaters.