Water Holding Capacity, Field Capacity, and Total Available Water Capacity (TAWC) represent distinct hydrological properties of soils, corresponding to different energy states and water retention thresholds.
The retrieved hydrological literature consistently treats field capacity (water content at specific matric potentials like -0.33 bar), general water holding capacity/retention, and available water capacities (such as plant-available water holding capacity) as distinct parameters and measurement endpoints in soil physics.