Journal of Irrigation and Drainage Engineering: Recent submissions
Now showing items 2781-2800 of 3826
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Head-Discharge Relationship in Flumes of Compound Sections
(American Society of Civil Engineers, 1998)The subject of investigation in this experimental study is discharge estimation in flow measurement flumes of rectangular compound cross sections with different geometries. General equations for -
Suitability of Selected Flow Equations and Variation of Manning's <b><i>n</i></b> in Furrow Irrigation
(American Society of Civil Engineers, 1998)Simulation models are becoming valuable tools for design and management of furrow irrigation systems. The Manning equation is used often for describing overland flow in these models. The past studies suggest that the Manning ... -
Spatial and Temporal Errors in Estimating Regional Evapotranspiration
(American Society of Civil Engineers, 1998)Current methods of computing regional crop evapotranspiration (ET), the prime variable in estimating irrigation demand, largely ignore the spatial and temporal variability of ET parameters, thus introducing errors. In this ... -
Introduction of Smith Predictor into Dynamic Regulation
(American Society of Civil Engineers, 1998)The architecture of Dynamic Regulation implemented in the Canal de Provence since 1971 consists of open loop/closed loop coupling. In addition, to take into account the interactions between the different reaches of a canal, ... -
Nonlinear Programming Model for Extensive Irrigation
(American Society of Civil Engineers, 1998)In regions where irrigation water supply is less than the required amount, extensive but deficit irrigation becomes unavoidable, unless the irrigated area can be limited to ensure full supply. When reliable dated crop-water ... -
Kostiakov Infiltration Parameters from Kinematic Wave Model
(American Society of Civil Engineers, 1998)The Kostiakov infiltration equation relates cumulative water infiltrated to the infiltration opportunity time. The kinematic wave model can be used to simulate surface irrigation system performance. Input to the kinematic ... -
Infiltration Model for Furrow Irrigation
(American Society of Civil Engineers, 1998)Infiltration rates of soils are spatially and temporally variable, which complicates surface irrigation management. The variability is magnified when water supplies are limited because crops in some portions of the field ... -
Improved Water Quality through Water Table Management in Eastern Canada
(American Society of Civil Engineers, 1998)A two-year field study was conducted in eastern Ontario to evaluate the effects of water table management on the quality of subsurface drain flows. Drainage discharge volumes and -
Development and Evaluation of Canal Automation Algorithm CLIS
(American Society of Civil Engineers, 1998)A canal automation algorithm named CLIS has been further developed and evaluated using test cases set by the ASCE Task Committee on Canal Automation Algorithms. The control algorithm is based on an inverse solution method ... -
Nondimensional Expression of Unsteady Canal Flow
(American Society of Civil Engineers, 1998)By appropriate choice of reference variables, dimensionless governing equations and initial and boundary conditions of unsteady canal flow have fewer independent parameters that do their dimensioned counterparts; the same ... -
Theory of Pipe Drainage Assisted by Mole Drainage
(American Society of Civil Engineers, 1998)This paper addresses the problem of draining a heavy soil of low hydraulic conductivity overlying an impermeable layer by means of a combined system of pipe and mole drains. The analysis uses the complex functions and the ... -
Irrigated Cropping Optimization
(American Society of Civil Engineers, 1998)This paper develops a nonlinear optimization model for the determination of optimal cropping patterns in irrigated agriculture. Decision variables are the cultivated area in each soil type at the farm. The objective function ... -
Editorial
(American Society of Civil Engineers, 1998) -
Canal Control Algorithms Currently in Use
(American Society of Civil Engineers, 1998)Many canal control methods and algorithms have been developed, but only some of them are being used on operating canal projects. As a part of the ASCE task committee on canal automation algorithms, this paper discusses ... -
Irrigation Performance Measures: Efficiency and Uniformity
(American Society of Civil Engineers, 1997)It is essential to standardize the definitions and approaches to quantifying various irrigation performance measures. The ASCE Task Committee on Defining Irrigation Efficiency and Uniformity provides a comprehensive ... -
Influence of Canal Geometry and Dynamics on Controllability
(American Society of Civil Engineers, 1998)This paper presents the results of the Task Committee on Canal Automation Algorithms with regard to the influence of canal properties on the controllability of irrigation canals. While the control provided by individual ... -
Test Cases for Canal Control Algorithms
(American Society of Civil Engineers, 1998)The ASCE Task Committee on Canal Automation Algorithms developed a series of test cases to test the general suitability of canal-control scheme logic. The primary intent of these tests is preliminary screening of various ... -
Canal Control Algorithm Formulations
(American Society of Civil Engineers, 1998)Over the past two decades, numerous automatic control systems have been proposed for irrigation canal operation. Types of automatic control systems range from empirically based, for a one-canal pool, to multivariable ... -
Accuracy of Irrigation Efficiency Estimates
(American Society of Civil Engineers, 1997)Evaluation of actual irrigation system performance should rely on an accurate hydrologic water balance over the area considered. In a companion paper, water uses are categorized as consumptive or nonconsumptive, and ... -
Estimation of Global Irrigation Distribution Uniformity
(American Society of Civil Engineers, 1997)For most irrigation systems, the most practical method for determining the global distribution uniformity (i.e., that experienced by the entire crop) is to measure the uniformity resulting from several components and combine ...