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Western Kansas poor rangeland: Western Kansas fa i r ran gel and: Western Kansas good rangeland: 1 ton/acre/year 0.5 ton/acre/year 0.25 ton/acre/year I I I I I I I I I I I I I I I I I I I Arkansas and Cimarron Ri vers, the so 11 s are deep, grayi sh-brown s11 t 10ams and sandy 1 oams, and pal e-brown loamy fi ne sands and fi ne sands. The depth to the secondary carbonates is from 1 ess than 36 inches to greater than 60 inches. As one moves eastward into Trego and Ness Counties, the so 11 s are descri bed as deep and moderately deep, dark grayi sh-brown s11 t 10ams and moderately deep, gray clays with depth to secondary carbonates of less than 36 inches. South of the Arkansas River the description is moderately deep and shall ow, reddi sh-brown 10ams and c1 ays, and deep, grayi sh-brown s11 t 10ams and clay 10ams, and pale-brown loamy fine sands and fine sands with the depth to the secondary carbonates of from less than 36 inches to more than 60 inches. Particularly for northwest Kansas, a concern expressed in the Kansas Water Quality Management Plan is that soil conservation practices could prove detrimental to stream systems. Conservation practices will probably achieve appreciable flow reduction even though the delivered water would be more silt free. The area most susceptible to wind erosion appears to be the Cimarron Basin as the wind velocities in that area are the highest in the State. The Kansas Water Qual ity Management P1 an (1979) presents estimates of natural rates of erosion and sediment del ivery to streams for native land, current conditions and for future levels of achievement of conservation. The natural rates in the western most areas appear to be less than 1 ton per acre per year; Upper Arkansas, 0.4 to 0.6, and Cimarron, 0.3 to 0.6. However, the rate in 1967 was: Upper Arkansas 2.9 to 3.2, and Cimarron, 2.4 to 2.6. The report indicates appreciable reductions are possible with various conserva- tion schemes. A prior report, Bulletin Number 16 (1971) gave the following sediment yields, which are a portion of the total erosion quantities: The report indicates the low yield of sediment is due to semiarid cli- mate and gentle to flat topography. "The flat to rolling plains may produce less than 0.34 ton/acre/year. The more rolling northern and eastern sections may produce 0.23 to 0.78 ton/acre/year. Highly erosive, deep loess soils in the steeply rolling county of Cheyenne and Rawlins Counties and, to some 1-4