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 watch over / Saied Mostaghimi ... [et al.] -- tracking / William L. Magette

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55 An aquifer is a geologic formation saturated by water that yields appreciable quantities of water that can be economically used and developed. 11). The water level in a well in an unconfined aquifer will rise to the level of the surrounding water table. Confined aquifers, also known as artesian or pressure aquifers, are bounded above and below by formations with significantly lower hydraulic conductivity than the aquifer. The confining layers cause a confined aquifer to be under pressure. The water level in a well in a confined aquifer will rise to the level of the hydraulic head at the upstream end of the confined aquifer.

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.

1 Groundwater Flow Estimation The governing equation for groundwater flow is Richards equation, just as it was for soil moisture movement. When considering soil moisture movement earlier, Richards equation was written for flow in the vertical direction. 16) where Ss is specific storage (LϪ1), defined as the volume of water that a unit volume of porous medium releases from storage per unit change in hydraulic head, and other variables are as defined previously. 18) The solution to the Laplace equation gives the hydraulic head in terms of x, y, and z.

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