If the infiltration intensity is less then the saturated permeability coefficient, the surface soil finally reaches to an unsaturated infiltration stage instead of saturated infiltration stage. 當(dāng)降雨強(qiáng)度小于土體的飽和滲透系數(shù)時(shí)，表層土體達(dá)不到飽和狀態(tài)，最終的穩(wěn)定入滲只能達(dá)到一個(gè)非飽和入滲狀態(tài)。