Fig. 5. Mean total E. coli (cfu) discharged from 48, 2.0-m-wide by 3.0-m-long annual grassland runoff plots across the 2002–2003 and 2003–2004 rainfall seasons following application of a total of 41.5 x 109 E. coli (cfu) in cattle fecal material. (a) Mean discharge for buffer treatments of 0.1-m buffer, 1.1-m buffer, 2.1-m buffer, and a no fecal application negative control; calculated by combining rainfall season, land slope, and residual dry matter treatments. (b) Mean discharge for residual dry vegetation matter in October treatments of 225, 560, 900, and 4500 kg/ha; calculated by combining rainfall season, land slope, and buffer treatments. (c) Mean discharge for land slope treatments of 5, 20, and 35%; calculated by combining rainfall season, buffer, and residual dry matter treatments. Error bars report one standard error of the mean.