Fig. 1.

(A) Land use (USDA National Agricultural Statistics Service, 2008b) and (B) location of USGS gaging stations (31 sampling locations) in eastern Iowa. Sites where water samples were collected for analysis in 2008 are designated with black triangles. The number adjacent to this map symbol denotes the corresponding map number that is cross-referenced in Table 4

 


Fig. 2.

Maps demonstrating the spatial distribution of near peak flow total nitrogen (A) concentration (B) load and (C) yield spatial distributions of the 31 sites during the June 2008 flood. Note: total nitrogen data not available for map #3.

 


Fig. 3.

Maps demonstrating the spatial distribution of near peak flow total phosphorus (A) concentration (B) load and (C) yield spatial distributions of the 31 sites during the June 2008 flood.