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

By William F. Ritter, Adel Shirmohammadi

ISBN-10: 1566702224

ISBN-13: 9781566702225

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.] -- top administration practices for nonpoint resource toxins keep watch over / Saied Mostaghimi ... [et al.] -- tracking / William L. Magette

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A major limitation to the USLE is that it explicitly predicts the long-term annual average soil loss, and it estimates spatial averages of erosion on a hillslope. In other words, USLE provides no information on nontemporal and spatial variability of erosion. The critical deficiency in terms of nonpoint source pollution is that the USLE predicts average soil loss only over the area of net soil loss. It does not predict deposition or sediment delivered from a field or end of slope, nor does it provide any information on the chemical-carrying capacity or enrichment ratio of the sediment generated by erosion.

McWhorter, D. , Vertical flow of air and water with a flux boundary condition, Trans. ASAE, 19, 259, 1976. 37. Brustkern, R. L. and H. J. Morel-Seytoux, Description of water and air movements of soils, J. , 24, 21, 1975. 38. Skaggs, R. W. and Khaleel. , Infiltration, in Hydrologic Modeling of Small Watersheds, Haan, C. , Johnson, H. , and Brakensiek, D. , ASAE, St. Joseph, MI, 1982, 119. 39. Richards, L. A. Capillary conduction through porous mediums, Physics, 1, 313, 1931. 40. McIntyre, D. , 85, 185, 1958.

It is the subdivision of the erosion process that opened the “black box” that was employed by earlier, statistically based erosion models such as the USLE5. Rills are conceived as being the primary mechanism of sediment transport in the downslope direction. Depths of flow in rills are considered to be relatively large (normally on the order of cm) compared with average broad sheet flow depths (on the order of mm). Detachment of soil in rills is primarily by scour, whereas the principal mechanism of detachment in interrill areas is by raindrop splash.

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


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