Submitted to: Soil and Water Conservation Society
Publication Type: Abstract Only
Publication Acceptance Date: 2/12/2007
Publication Date: 7/21/2007
Citation: Sadler, E.J., Lerch, R.N., Sudduth, K.A., Kitchen, N.R., Kremer, R.J., Alberts, E.E. 2007. The Mark Twain Lake/Salt River CEAP Project – Progress and Preliminary Findings [abstract]. Soil and Water Conservation Society Annual Conference, July 21-25, 2007, Tampa, Florida.
Technical Abstract: The Mark Twain Lake collects drainage from approximately 6600 km2 of the Salt River basin, most of which represents the Midwest claypan major land resource area. Thus, it is likely the watershed most prone to surface runoff in the CEAP benchmark network. High surface runoff from agricultural land with widespread use of soluble herbicides poses a threat to the environment, which has been recognized in the case of atrazine. The Mark Twain CEAP project includes a monitoring campaign designed to allow a mass balance to be made on the lake itself, with 13 autosamplers deployed April-November either at USGS gauging stations or at sites where the project is developing rating curves. These are programmed for flow-proportional samples during runoff events, which are augmented by regular grab samples during base flow year-round. The project also includes a simulation modeling effort to assist in scaling information gained at plot and field scale up to increasingly larger watersheds, from the long-term Goodwater Creek Experimental Watershed to, eventually, the entire basin. Current modeling efforts are focused on calibrating and validating SWAT at the Goodwater Creek Watershed scale. Cooperative partners are examining sensitivity of SWAT to BMPs employed in the watershed.