Current understanding of streamflow composition in mountain watersheds is often limited by
inherent uncertainties and collection limitations in field data and assumptions associated
with modelling techniques. Additional complexity arises in catchments experiencing land‐
cover change. Here, a hillslope model with fully integrated processes from the subsurface
through the canopy is combined with Lagrangian particle tracking through the surface and
subsurface domains to understand changes in flow paths and source waters with insect …