This paper presents a DEM-coupled multi-agent prototype that explores beaver-inspired trail formation and canalization as a process-first landscape design method. In NetLogo, the DEM provides slope/aspect fields, and water-tracer particles provide wetness cues during periodic reflooding. Agents generate trails as an intensity field via repeated movement, then excavate on wet cells, accumulating an excavation field that can deepen reinforced corridors into canals. The tool supports scenario comparison rather than prediction: users vary exploration bias, reinforcement/decay, excavation thresholds, slope limits, and reflooding timing, then assess corridor patterns in maps. In a representative case study, simulated trail-and-canal concentrations align with patterns in time-stamped imagery. Limitations include proxy hydrology and no terrain or hydraulic updating; future work couples excavation to flow and morphodynamics.