The objective of this study was to assess the non‐point source pollution reductions by a silt fence and berm through field monitoring. Experimental plots were established in two sizes on three slopes (110 m 2 on 3 and 9% slopes, and 225 m 2 on 6% slope). Flumes were used to monitor plot runoff. Runoff samples were collected during heavy rainfall (12 events from 2011 to 2014) for subsequent analysis. Cultivated crops were radis...