evaluation of methods for driving infiltration equations of furrow irrigation

In this study, six extracting method of infiltration equation in furrow in Lavark field of Isfahan University of technology was performed and the rate of surface storage change has been calculated. . Information were collected, among three replications and five furrow irrigation event, double ring test, include cross-section, advance, recession, inflow and outflow rates, in addition to infiltration changes in submerged static condition and hydraulic conductivity of soil. The results were analyzed using a randomized complete block design. the study of infiltration process related to the various equations showed that there is high statistically significant difference at level of one percent in estimation of average infiltration in different time intervals of five using these equations. The most infilteration rate is related to volume balance equation and the least value was observed in input-output method results.On the other hand,According to result,the errors least(nearly zero) related to modified double ring equation.In fact, this equations,according to modified with the measured amount of water infiltration and the average infiltration time taken them, For the duration of the tests (average time of about one hour influence) is very near the measured values have been obtained on the farm. Generally, the equations with polynomial-power function estimated greater infiltration rate than simple power equations. This study showed that it is necessary to operate the farm experimentals corresponding with the applicational conditions of farm.