Journal of Irrigation and Drainage Engineering: Recent submissions
Now showing items 2181-2200 of 3826
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Semianalytical Model for Drawdown due to Pumping a Partially Penetrating Large Diameter Well
(American Society of Civil Engineers, 2007)A semianalytical model is developed for computing drawdowns in and around a partially penetrating large diameter well. The new model can take into account an unsteady pumping discharge and thus drawdowns during recovery ... -
Comparison of Priestley-Taylor and FAO-56 Penman-Monteith for Daily Reference Evapotranspiration Estimation in Georgia
(American Society of Civil Engineers, 2007)The climate in Georgia and other southeastern states of the United States is considered to be humid and the annual precipitation is usually greater than the annual potential evapotranspiration (ET). However, during several ... -
Water Table Fluctuation between Drains in the Presence of Exponential Recharge and Depth-Dependent Evapotranspiration
(American Society of Civil Engineers, 2007)A linearized form of the Boussinesq equation was solved analytically to predict the water table fluctuation in subsurface drained farmland in the presence of recharge and evapotranspiration (ET). The recharge was assumed ... -
Hargreaves versus Penman-Monteith under Humid Conditions
(American Society of Civil Engineers, 2007)The Food and Agriculture Organization of the United Nations (FAO) has proposed using the Penman-Monteith equation as the standard for estimating reference evapotranspiration -
General Irrigation Planning Performance of Water User Associations in the Gediz Basin in Turkey
(American Society of Civil Engineers, 2007)In this study, an evaluation has been made of the realization level of the planned targets in irrigation planning for all of the 13 water user associations (WUAs) of the Gediz Basin. This evaluation was made according to ... -
Crop Coefficients for Microsprinkler-Irrigated, Clean-Cultivated, Mature Citrus in an Arid Climate
(American Society of Civil Engineers, 2007)Crop evapotranspiration -
Seepage Modeling Assisted Optimal Design of a Homogeneous Earth Dam: Procedure Evolution
(American Society of Civil Engineers, 2007)Presented herein is a procedure for arriving at an optimal design of a homogeneous earth dam laid on an impervious foundation and provided with a drain. The procedure, heavily dependent on variably saturated flow modeling, ... -
Automatic Tuning of PI Controllers for an Irrigation Canal Pool
(American Society of Civil Engineers, 2007)This paper presents a method to automatically tune decentralized proportional integral (PI) controllers for an irrigation canal pool. The auto tune variation (ATV) method is based on a relay experiment, which generates ... -
Flexible Irrigation Systems: Concept, Design, and Application
(American Society of Civil Engineers, 2007)This paper presents the need, value, and concept of flexible irrigation water supply systems that can deliver water with flexibility in frequency, rate, and duration under the control of the farmer at the point of application ... -
Groundwater Flow and Contaminant Transport Simulation with Imprecise Parameters
(American Society of Civil Engineers, 2007)A methodology has been developed in this study wherein a genetic algorithm (GA) is used to find a global optimal solution to a groundwater flow and contaminant problem by incorporating an artificial neural network (ANN) ... -
Simultaneous Prediction of Saturated Hydraulic Conductivity and Drainable Porosity Using the Inverse Problem Technique
(American Society of Civil Engineers, 2007)The saturated hydraulic conductivity -
Flooding Probability Constrained Optimal Design of Trapezoidal Channels
(American Society of Civil Engineers, 2007)Trapezoidal open channels are designed for specified slope, specific lining materials, and for a specified design flow. These input design parameters are prone to uncertainties. The freeboard is used to confine the flow ... -
Simple Flume for Flow Measurement in Sloping Open Channel
(American Society of Civil Engineers, 2007)First, this paper presents a new flume for measuring flow discharge in sloping channels, originally proposed by Samani and Magallanez for use in a horizontal channel. The flume is obtained by inserting two semicylinders ... -
Modeling Laboratory Observations on Stream-Aquifer Interaction
(American Society of Civil Engineers, 2007)A head loss concept, new to the stream-aquifer interaction, is introduced for modeling laboratory observations. Using this concept, the equation applicable to fully penetrating streams is modified to account for the head ... -
Effect of Periodic and Continuous Irrigation on Water Transport through Porous Media
(American Society of Civil Engineers, 2007)In this paper, we compare the effect of two modes of irrigation on water transport through an unsaturated porous medium. The two modes studied are (1) periodic and (2) continuous irrigation. The former process consists of ... -
Discussion of “Uniform and Critical Flow Computations” by Ramappa G. Patil, J. S. R. Murthy, and L. K. Ghosh
(American Society of Civil Engineers, 2006) -
Considerations for the Design of Intercepting Drainage for Collecting Water from Seep Areas
(American Society of Civil Engineers, 2006)Springs that appear at multiple sites on sloping lands and create problems of excess soil moisture and reduced crop yield require the implementation of a network of intercepting drains. The water removed by the intercepting ... -
Discussion of “Uniform and Critical Flow Computations” by Ramappa G. Patil, J. S. R. Murthy, and L. K. Ghosh
(American Society of Civil Engineers, 2006) -
Seepage to a Drainage Ditch and Optimization of Its Shape
(American Society of Civil Engineers, 2006)An optimal shape design problem for an empty drainage ditch is solved and it is shown that a semicircle intercepting saturated seepage from two constant potential rays is a contour of constant Darcian velocity and of maximal ... -
Evaluating Bioretention Hydrology and Nutrient Removal at Three Field Sites in North Carolina
(American Society of Civil Engineers, 2006)Three bioretention field sites in North Carolina were examined for pollutant removal abilities and hydrologic performance. The cells varied by fill media type or drainage configuration. The field studies confirmed high ...