This study examined a simulation performed using the Flow 3D program and compared the outcomes with general and positional equations for calculating the discharge through water facilities that had been established in earlier studies. and investigated the traits of the flow passing through irrigation regulators and the variables influencing them for the two situations of flow at the total opening and partial opening of the regulator gate. Based on the findings of laboratory measurements, the coefficients and other components in the equations for estimating discharge were calculated, and links between these coefficients and the non-dimensional components impacting the flow calculated in the laboratory were drawn.