Abstract: Flow to subsurface drain tubes was investigated using numerical solutions to the Richards equation for combined unsaturated and saturated flow. Solutions to three sets of problems involving steady infiltration and transient ...

Abstract: This study was conducted to examine the entrance resistance and head losses in the immediate vicinity of subsurface drains and to measure the change with time just after drain installation. Laboratory experiments were ...

Abstract: The effects of land clearing and drainage as well as effect of drainage system design and management upon hydrologic and water quality parameters were determined. The most dramatic effect of agricultural land development ...

Abstract: Most models for subsurface drainage in flat lands are based on the Boussinesq equation. This paper compares a semianalytical model called SIDRA, which assumes a constant water‐table shape during the period of water table ...

Abstract: Modeling the hydrology of a forest watershed is helpful to understand the interaction of the hydrologic components and the effects of management activities on the performance of the system. This study was conducted to ...

Abstract: The hydrology of two North Carolina muck soils was simulated using four water‐management methods; conventional drainage, improved subsurface drainage, and two types of controlled drainage. One soil was much more responsive ...

Abstract: A process that uses the field‐scale model DRAINMOD to simulate the hydrologic response of a watershed to peat mining is presented. An eastern North Carolina watershed has been proposed as the site of a peat mining project. ...

Abstract: The northeastern and Appalachian states have a diverse array of geology, soils, and climate. Irrigation is concentrated in a few states, with the largest irrigation area in the Coastal Plain soils. Most of these soils are ...

Abstract: The Penman-Monteith, Makkink, Priestley-Taylor, Turc, Hargreaves-Samani, and Thornthwaite methods were used to estimate reference evapotranspiration (REF-ET) at three sites in eastern North Carolina. The Penman-Monteith ...

Abstract: A coupled model was used to simulate the hydrology of a 22 km