Abstract: Due to the widespread use of ground water as a supply of drinking water in the United States, predicting the effect that nonpoint sources of contamination have on the quality of nearby ground‐water supplies is an important ...

Abstract: A model is developed for simulating the vertical movement of water through a crop's root system. The root‐water flow model is then coupled to a variably‐ saturated flow model via a root extraction term that is a function ...

Abstract: A numerical model is developed for simulating the interaction of a surface water body with a variably saturated porous medium. A boundary condition simulating the soil‐water pressure head at the boundary between the porous ...

Abstract: A methodology is developed for simulating the movement of water and solutes through a root‐soil system, which accounts for the effect of the solute concentration on the extraction of soil water by a transpiring crop's root ...

Abstract: A physically based model for the management and forecasting of irrigation water requirements at an on‐farm level is developed. The model includes mechanisms for simulating root and soil‐water movement, root growth, and ...

Abstract: A methodology is developed that estimates the parameters and the past pumping or recharge history of an aquifer simultaneously. A maximum likelihood procedure is used to estimate the aquifer's parameters in conjunction ...

Abstract: This paper presents a time-series methodology by which a significant trend in climatological variables can be identified and notes how this trend may be related to other climatological variables. The evapotranspiration ...