“VALIDATION OF THE KOOL AND PARKER CONSTITUTIVE MODEL IN HYDRUS-2D: DEPTH-DEPENDENT HYDRAULIC HYSTERESIS AND DRAINAGE DYNAMICS IN UNSATURATED SOILS”. ASEAN Engineering Journal, vol. 16, no. 1, Mar. 2026, pp. 175-8, https://doi.org/10.11113/aej.v16.24826.