Management of the irrigation scheme would be confusing in the absence of certainty in water level-discharge estimation. Accordingly, accurate flow prediction allows for more informed operating decisions in achieving the desired target of saving water. The Kufa River's rating curve was estimated using the Conveyance Estimation System (CES) in the current study. The CES outcomes were validated using the field data at specified cross-sections. The statistical indicators of BIAS, MAE, and NSE showed that the estimated rating curve and the field measurements were in reasonable agreement. Based on the findings in this study, hydraulic engineers can use the CES model as a prediction tool in the field of water engineering in making informed decisions regarding the design and operation policies.