American Society of Agricultural and Biological Engineers



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EFFECT OF REDUCED EFFLUENT PHOSPHORUS CONCENTRATIONS AT THE ILLINOIS RIVER, NORTHWEST ARKANSAS, 1997–2004

Published by the American Society of Agricultural and Biological Engineers, St. Joseph, Michigan www.asabe.org

Citation:  Watershed Management to Meet Water Quality Standards and Emerging TMDL (Total Maximum Daily Load) Proceedings of the Third Conference 5-9 March 2005 (Atlanta, Georgia USA) Publication Date 5 March 2005  701P0105.(doi:10.13031/2013.18102)
Authors:   Brian E. Haggard

The focus of this study is the Illinois River Basin in the southwestern portion of the Ozark Plateaus physiographic province (Fenneman, 1938) of northwestern Arkansas and northeastern Oklahoma (Figure 1), which is underlain with cherty limestone of the Springfield Plateau province (Adamski et al., 1995). The Illinois River Basin is about equally divided between the states of Arkansas and Oklahoma where a small impoundment exists on this river near the stateline. Several U.S. Geological Survey (USGS) streamflow and water–quality monitoring stations exist throughout the catchment in Arkansas and Oklahoma. The most notable USGS monitoring station is the Illinois River, South of Siloam Springs (Station No. 07195430) at the Highway 59 bridge crossing the stream in Benton Country, Arkansas. The 1500 km2 drainage area upstream from this point on the Illinois River has been coined the Illinois River Drainage Area (IRDA) in northwestern Arkansas and is predominately an agricultural catchment with 58, 36 and 6% in pasture, forest and urban land use.

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