Agricultural nonpoint source pollution : watershed by William F. Ritter, Adel Shirmohammadi

By William F. Ritter, Adel Shirmohammadi

Content material: Hydrology / Mary Leigh Wolfe -- Soil erosion and sedimentation / Mark A. Nearing, L. Darrell Norton, and Xunchang Zhang -- Nitrogen and water caliber / William F. Ritter and Lars Bergstrom -- Phosphorus and water caliber affects / Kenneth L. Campbell and Dwayne R. Edwards -- insecticides and water caliber affects / William F. Ritter -- Nonpoint resource toxins and cattle manure administration / William F. Ritter -- Irrigated agriculture and water caliber affects / Blaine R. Hanson and Thomas J. Trout -- Agricultural drainage and water caliber / William F. Ritter and Adel Shirmohammadi -- Water caliber versions / Adel Shirmohammadi ... [et al.] -- most sensible administration practices for nonpoint resource toxins keep an eye on / Saied Mostaghimi ... [et al.] -- tracking / William L. Magette

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ASCE, 95, 861, 1969. 27. Lighthill, M. J. and Whitman, G. , On kinematic waves 1. Proc. , London, A, 229, 281, 1955. 28. Overton, D. , 8, 1198, 1972. 29. Foster, G. , Huggins, L. , and Meyer, L. , 4, 1179, 1968. 30. Novotny, V. and Olem, H. Water Quality: Prevention, Identification, and Management of Diffuse Pollution, Van Nostrand Reinhold, New York, 1994. 31. Woolhiser, D. A. and Liggett, J. , Unsteady one-dimensional flow over a plane—the rising hydrograph, Water Resources Research, 3, 753, 1967.

D. 1 INTRODUCTION Soil erosion includes the processes of detachment of soil particles from the soil mass and the subsequent transport and deposition of those sediment particles on land surfaces. Erosion is the source of 99% of the total suspended solid loads in waterways in the United States1 and undoubtedly around the world. Somewhat over half of the approximately 5 billion tons of soil eroded every year in the United States reaches small streams. This sediment has a tremendous societal cost associated with it in terms of stream degradation, disturbance to wildlife habitat, and direct costs for dredging, levees, and reservoir storage losses.

9. Slope has a significant effect on interrill sediment delivery, primarily because it influences the sediment transport capacity of the interrill flow. 9) where S is slope steepness (m/m) and z is a regression coefficient. 10) where ␪ is the interrill slope angle. 09). 0 (␪ ϭ 45°). The slope to which the slope adjustment function is normalized is relatively unimportant, as long as the interrill erodibility term, Ki, is calculated from experimental data in a way that is consistent with the model formulation.

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