Field Evaluation of Furrow Infiltration and Advance Functions

ABSTRACT MORE than 100 comprehensive furrow evaluations were made at three Colorado locations. These data were used to study the adequacy of various infiltration and advance relations based on a kinematic, or volume balance, approach. The Kostiakov-Lewis function with an additional term for the asymptotic long-time infiltra-tion rate proved highly effective in simulating infiltrated volumes when reliable estimates of the steady infiltration rate could be obtained. The commonly employed power advance function was calibrated using regression and the **two-point method, with the latter demonstrating substantial advantages.