Experimental Study of Water Infiltration in Unsaturated Horizontal Sand Columns under Various Air Confinement Conditions

Table 1

Design of the five experiments.

Air vents	Expt. #1	Expt. #2	Expt. #3	Expt. #4	Expt. #5
V1 (180 cm)	Open	Shut	Shut	Open	Shut
V2 (120 cm)	Shut	Open	Shut	Open	Open
V3 (60 cm)	Shut	Shut	Open	Open	Open

indicates the open valve farthest from the column inlet.