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This study used the location of the average advance time (method 1) and the mean infiltration opportunity time (method 2) as the midpoint of the twopoint method for determining "power advance" and Kostiakov-Lewis infiltration parameters. Experiments were carried out in three border-irrigated fields. The results showed that calibration of the power advance equation obtained by the Elliot and Walker method had high accuracy, with an average relative error of 11.3% in the time to complete the advance phase. The root mean square deviation (d RMS ) index used by Elliot and Walker showed that method 1, with an average d RMS value of 15.7 min, has the lowest d RMS , which estimates the advance time with mean d RMS values of 5.1 and 1.8 min less than the proposed method 2 and the method of Elliot and Walker, respectively. Furthermore, using all methods, the Kostiakov-Lewis infiltration equation parameters were determined. In estimating infiltration depth, method 1 had the highest accuracy with a minimum relative error of 0%, a maximum relative error of 8.7%, and an average relative error of 3.8%. Based on both the d RMS index and the accuracy of the infiltration equation, method 1 had a higher accuracy. K E Y W O R D S average advance time, design, evaluation, infiltration opportunity, volume balance Résumé Cette étude a utilisé l'emplacement du temps moyen d'avance (méthode 1) et le temps moyen d'occasion d'infiltration (méthode 2) comme point médian de la méthode à deux points pour déterminer les paramètres d'infiltration "avance de puissance" et Kostiakov-Lewis. Des expériences ont été menées dans trois champs irrigués selon la méthode border irrigation. Les résultats ont montré que l'étalonnage de l'équation d'avance de puissance obtenue par la méthode Elliot et Walker avait une grande précision, avec une erreur relative moyenne de 11,3% dans le temps pour terminer la phase d'avance. L'indice d'écart quadratique moyen ine (d RMS ) utilisé par Elliot et Walker a montré que la * Etude du point médian d'une méthode en deux points pour prédire l'avance et l'infiltration dans l'irrigation de surface

The Kostiakov–Lewis equation is one of the commonly used infiltration equations in furrow irrigation. Elliott and Walker developed a two‐point method to estimate coefficients of the Kostiakov–Lewis equation. The basic infiltration rate (fo) in the Kostiakov–Lewis equation is usually calculated by the inflow–outflow method to determine the other two Kostiakov–Lewis parameters. In that method the entire furrow is used as an infiltrometer, which can cause overestimation of fo. In this study, by considering a correction factor in the mathematical calculations where the newly calculated value of fo is represented as fo* and the values of the a and k parameters, as calculated during the advance phase, are represented as a* and k*. The amount of infiltration volume estimated by the proposed method was evaluated using 21 open‐ended furrow irrigation data sets by calculating the relative error (RE) index. The value of fo decreased and the values of a and k increased by using the proposed method as compared to the Elliott and Walker method. Therefore, the results showed that the proposed method estimated infiltration volume with greater accuracy (average absolute RE = 4.0%) as compared to the Elliott and Walker method (average absolute RE = 7.8%).

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