Journal of Irrigation and Drainage Engineering: Recent submissions
Now showing items 2861-2880 of 3826
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Response of Unconfined Aquifer to Sudden Change in Boundary Head
(American Society of Civil Engineers, 1997)Simple, analytical approximations to the solution of the one-dimensional Boussinesq equation are obtained using a weighted residual method. The approach can be applied to both the recharging and the dewatering of an ... -
Field Strategy for Agricultural Drainage and Water-Quality Management
(American Society of Civil Engineers, 1997)An integrated irrigation-drainage design and management system is developed and applied to a hypothetical farm representative of the field conditions of the San Joaquin Valley (SJV), Calif. through computer simulations. ... -
Reliability of Steady Surface Profile in Irrigation Canal
(American Society of Civil Engineers, 1997)A reliability problem in irrigation canal systems where the water demand fluctuates stochastically is examined. A flow model of open channel with control structures is developed to include the lateral withdrawal, in which ... -
Discussion and Closure: Implications of Using Approximate Expressions for Well Function
(American Society of Civil Engineers, 1996) -
Evaluating Pressure Losses in Drip-Irrigation Lines
(American Society of Civil Engineers, 1997)In this paper an experimental investigation was carried out to deduce an evaluating procedure of local losses due to the protrusion of emitter barbs into the flow in drip-irrigation lines. Local losses corresponding to ... -
Determination of Watershed Curve Number Using Derived Distributions
(American Society of Civil Engineers, 1997)Curve numbers (CNs) are developed from measured rainfall ( -
Mobile Flume for Pipe Flow
(American Society of Civil Engineers, 1997)Discharge measurement in partially filled pipes, as occurs in sewage and drainage engineering, is considered with an improved device. The so-called pipe flume is suited for mobile discharge measurement either for a single ... -
Crop Growth and Water Use Model for Lettuce
(American Society of Civil Engineers, 1996)Crop evapotranspiration ( -
Weighted Factors in Computer-Aided Land Leveling
(American Society of Civil Engineers, 1996)Application of the plane method to solve land-leveling (or land-forming) problems in fields, even with irregular shapes, can easily be done by using computer programs. However, the introduction of the weighted factor, ... -
Modeling Microtopography in Basin Irrigation
(American Society of Civil Engineers, 1996)Microtopography has long been regarded as a key variable affecting basin irrigation performance. This paper reports on the extension of a flat bed two-dimensional basin irrigation model to the simulation of irrigation ... -
Hydraulic Analysis of Linear Dewatering Systems
(American Society of Civil Engineers, 1996)This paper is devoted to the problem of determination of steady-state, fully saturated flow velocities and water discharge near drains, ditches, series of wells, and similar hydrogeological objects. Traditional computational ... -
Design of Runoff Recycling Irrigation System for Rice Cultivation
(American Society of Civil Engineers, 1996)Design of a runoff-recycling-based irrigation system to provide irrigation for rice in monsoon season is a complex problem. The irrigation requirement, as well as the water availability in the form of runoff, vary both in ... -
Control of Seawater Intrusion through Injection-Extraction Well System
(American Society of Civil Engineers, 1996)Control of seawater intrusion through a series of injection-extraction wells is studied using a vertically integrated, two-dimensional, sharp interface model. The model is based on the Galerkin weighted-residual technique ... -
Theories of Ditch Drainage in Layered Anisotropic Soil
(American Society of Civil Engineers, 1996)Approximate theoretical formulas are derived for predicting the water table position for steady rainfall or steady irrigation recharge into soil bounded by equally spaced ditch drains dug up to an impervious layer in ... -
Performance of Baffle-Sluice Modules with Changed Module Dimensions
(American Society of Civil Engineers, 1996)An irrigation module delivers nearly constant discharge irrespective of water-level fluctuations in the supply channel. Low discharge baffle-sluice modules have been designed for the field outlets considering the desirable ... -
Electromigration of Nitrates in Soil
(American Society of Civil Engineers, 1996)Migration of chemicals in soils to surface or ground water has become a serious threat in many agricultural regions, with nitrates affecting the broadest area due to intensive fertilization and nitrate solubility. This ... -
Optimum Design and Operation of Multiple Subunit Drip Irrigation Systems
(American Society of Civil Engineers, 1996)A nonlinear model for the optimum design and operation of drip irrigation systems on flat terrain is presented in this paper. The analysis is based on dividing a field into subunits and evaluating various shift patterns ... -
Ditch Drainage Theories for Homogeneous Anisotropic Soil
(American Society of Civil Engineers, 1996)The problem of seepage of steady rainfall or irrigation recharge into a homogeneous and anisotropic soil medium, drained by equally spaced ditch drains overlying a barrier, is solved. Two general cases of the problem are ... -
Soil-Limiting Flow from Subsurface Emitters. II: Effect on Uniformity
(American Society of Civil Engineers, 1996)Soil variability can affect the flow rate of water from subsurface trickle emitters. This is because of a buildup of pressure in the soil when water cannot be easily transmitted away from the emitter. In this paper, an ... -
Evapotranspiration Estimates under Deficient Water Supplies
(American Society of Civil Engineers, 1996)Effective use of water supplies via irrigation requires good methods for determining crop water needs. To implement irrigation scheduling programs requires an accurate estimate of water use by the crop. This study was ...