Modified infiltration models were constructed using the wetted perimeter as a coefficient parameter (Strelkoff and Souza 1984; Nie et al.
The flow section area and wetted perimeter were graphically obtained from measured furrow cross-section for each infiltration test.
The path analysis method was conducted to quantify the effects of the opportunity time (T), initial soil water content (Q), bulk density (P), flow section area (S), wetted perimeter (Wp), water flow depth (H), and bottom width of furrow (W) as independent variables on the cumulative infiltration (1).
Clearly, the increasing wetted perimeter produces larger water flow area and gravity potential for unsaturated soil water flow (Nie et al.
i] in the two models increased with the increase in wetted perimeter from Expt 11 to Expt 13.
Wetted perimeter was an effectual component in furrow infiltration.
Therefore, the effect of wetted perimeter on the exponent a and the final infiltration rate [f.
The infiltration model with consideration of wetted perimeter was validated in different wetted perimeters of other soil types.
The results revealed that bulk density and wetted perimeter were the effectual components in furrow infiltration.