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Chemical Transport from Paired Agricultural and Restored Prairie Watersheds

Iowa Dep. of Natural Resources, Geological Survey Bureau, 109 Trowbridge Hall, Iowa City, IA 52242-1319

View larger version (47K): [in a new window]   Fig. 1. Location of watersheds, stream gauging sites, and areas of prairie plantings and farm management units managed by the U.S. Fish and Wildlife Service at Neal Smith National Wildlife Refuge.

View larger version (27K): [in a new window]   Fig. 2. Example of hydrograph separation for Water Year 1999 at the lower portion of the Walnut Creek watershed (WNT2). The enlarged area shows hydrograph separation and dates of stream sample collection.

View larger version (42K): [in a new window]   Fig. 3. Comparison of flow-weighted concentrations estimated with the ESTIMATOR program with actual concentration data for entire data set and baseflow data set. Data for Squaw Creek watershed only is shown; data for Walnut Creek were very similar and are available upon request.

View larger version (27K): [in a new window]   Fig. 4. Percentage of total flow and loads of NO3–N, Cl, and SO4 from baseflow inputs by water year. SQW2, Squaw Creek watershed outlet; WNT1, upper portion of the Walnut Creek watershed; WNT2, lower portion of the Walnut Creek watershed.

View larger version (42K): [in a new window]   Fig. 5. Monthly mean discharge and baseflow discharge, and total and baseflow monthly loads of NO3–N, Cl, and SO4 measured at the lower portion of the Walnut Creek watershed (WNT2) and the Squaw Creek watershed outlet (SQW2).

View larger version (25K): [in a new window]   Fig. 6. Percentage of total flow and loads of NO3–N, Cl, and SO4 from baseflow inputs by month at the lower portion of the Walnut Creek watershed (WNT2) and the Squaw Creek watershed outlet (SQW2).