Subsurface hydrographs, obtained during rainfall simulation on Im by Im plo
ts, were separated into macropore and micropore components by application o
f a dual-porosity concept and mass balance analysis. The corresponding solu
te concentrations in the two domains were also determined by mass balance a
nalysis. Time-domain reflectometry was then used to estimate similar outflo
w hydrographs and breakthrough curves at an upper depth in the A horizon of
the soil profile. The results show that the macropores contributed from 6
to 54% of total subsurface flow and from 1 to 61% of total solute mass tran
sported through the soil profile. (C) 2001 Silsoe Research.