For simulating the exact physical processes of water movement through a watershed's soil layers, what type of hydrologic model (empirical, conceptual, or physically-based) is most suitable?

For simulating the exact physical processes of water movement through a watershed's soil layers, a physically-based hydrologic model is most suitable. A hydrologic model is a simplified representation of a real-world hydrologic system, used to simulate water movement and storage processes. A watershed is an area of land where all water drains to a common outlet. Water movement through soil layers encompasses processes like infiltration, where water enters the soil surface; percolation, its downward movement through the soil profile; and subsurface flow, its lateral movement within the soil layers. For these "exact physical processes," physically-based models are designed to represent these mechanisms by solving fundamental physical laws and equations that govern fluid dyna....