Abstract: There is widespread concern about loss of sediment and NO3-N into surface water from irrigated farmlands. We studied effectiveness of PAM treatment under different flow conditions on sediment and NO3-N transport with runoff. Treatments included three different flow regimes, continuous, cutback and surge flow, which supplied either untreated or PAM-treated irrigation water. PAM was applied only in the first irrigation and 10 ppm was added to the irrigation water during the advanced period. PAM treatment reduced sediment transport by 83.7-97.5% during first irrigation and by 39.3-88.3% during the second. The PAM treatment’ effect on sediment reduction was similar for all flow regimes during the first irrigation. The cutback-flow, no-PAM, treatment produced nearly the same sediment reductions as PAM treatments. A non-erosive flow rate was used after cutback, and this reduced sediment transport. The PAM treatments consistently decreased NO3 runoff losses. In addition reducing runoff with different flow resulted in smaller NO3-N. Finally in this study, we recommend that 10 ppm PAM should be used during advanced time to decrease the amount of sediment and NO3-N transport in similar fields conditions. In addition, flow rate, which does not cause erosion or cutback flow, can be used with the PAM treatment. The other alternative is to use surge flow rather than the continuous flow in the first irrigation