Journal of Irrigation and Drainage Engineering: Recent submissions
Now showing items 2441-2460 of 3826
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Flow through Side Sluice Gate
(American Society of Civil Engineers, 2003)The hydraulic characteristics of a side sluice gate were studied experimentally. It was found that the specific energy remains constant along the side sluice gate. The coefficient of discharge for the side sluice gate is ... -
Irrigation Scheduling. II: Heuristics Approach
(American Society of Civil Engineers, 2004)A sequential irrigation schedule that honors user demands of duration and minimizes earliness and tardiness is interpreted as a single-machine schedule with earliness and tardiness costs and a common deadline (or fixed ... -
Direct Integration of the Equation of Gradually Varied Flow
(American Society of Civil Engineers, 2004)The steady flow in open channels, when the depth of the flow varies gradually with distance, is governed by the classic gradually-varied-flow equation. The solution of this ordinary differential equation allows the tracing ... -
Simple Optimal Downstream Feedback Canal Controllers: Theory
(American Society of Civil Engineers, 2004)A new class of downstream water-level feedback controllers is proposed that can vary from a series of individual proportional-integral (PI) controllers (each gate adjusted based on one water level) to fully centralized ... -
Forecasting of Reference Evapotranspiration by Artificial Neural Networks
(American Society of Civil Engineers, 2003)In recent years, artificial neural networks (ANNs) have been applied to forecasting in many areas of engineering. In this note, a sequentially adaptive radial basis function network is applied to the forecasting of reference ... -
Modeling Drainwater Selenium Removal in Wetlands
(American Society of Civil Engineers, 2004)Prediction of selenium (Se) mass distribution and Se speciation in wetlands is desired for a comprehensive assessment of the capability of vegetated wetlands to remove Se from agricultural drainage waters prior to impoundment ... -
Irrigation Scheduling. I: Integer Programming Approach
(American Society of Civil Engineers, 2004)This paper shows how a sequential irrigation schedule for a tertiary unit can be interpreted as a single machine scheduling problem with earliness, tardiness, and a common deadline. An integer program solution is presented ... -
Potential Evapotranspiration for the Distributed Modeling of Belgian Catchments
(American Society of Civil Engineers, 2004)To support a sensitivity analysis in the framework of catchment modeling, three potential evapotranspiration -
Simple Optimal Downstream Feedback Canal Controllers: ASCE Test Case Results
(American Society of Civil Engineers, 2004)In a companion paper, a class of downstream-water-level feedback canal controllers was described. Within this class, a particular controller is chosen by selecting which controller coefficients to optimize (tune), the ... -
Application of Two Drain Spacing Formula for Mexico’s Humid Tropical Zone
(American Society of Civil Engineers, 2004)The influence of spatial variability of saturated hydraulic conductivity -
Flow Depletion of Semipervious Streams Due to Pumping
(American Society of Civil Engineers, 2003)Expressions for the rate and volume of flow depletion of semipervious streams due to pumping are presented in computationally simple forms. Analytical expressions have been proposed to take into account both partial ... -
Linear Solution for Hydraulic Analysis of Tapered Microirrigation Laterals
(American Society of Civil Engineers, 2004)A simplified analytical solution that takes into account the effect of the emitter discharge exponent on the hydraulic computations of tapered microirrigation laterals, is presented. The hydraulic analysis is evaluated ... -
Discussion of “Decision Support System for Estimating Reference Evapotranspiration” by Biju A. George, B. R. S. Reddy, N. S. Raghuwanshi, and W. W. Wallender
(American Society of Civil Engineers, 2003) -
Daily Grass and Alfalfa-Reference Evapotranspiration Estimates and Alfalfa-to-Grass Evapotranspiration Ratios in Florida
(American Society of Civil Engineers, 2003)Efficient use of natural water resources in agriculture is becoming an important issue in Florida because of the rapid depletion of freshwater resources due to the increasing trend of industrial development and population. ... -
Field Verification of Two-Dimensional Surface Irrigation Model
(American Society of Civil Engineers, 2003)A two-dimensional (2D) model of unsteady shallow-water flow in surface irrigation was developed to evaluate the influence of field-grading precision on surface irrigation performance. This paper presents field data for ... -
Validation of a Predictive Form of Horton Infiltration for Simulating Furrow Irrigation
(American Society of Civil Engineers, 2003)Due to spatially varying conditions the improvement of furrow irrigation efficiency should be sought not just for a limited number of furrows or for one specific irrigation event. A simplified predictive modeling approach ... -
Solar and Net Radiation-Based Equations to Estimate Reference Evapotranspiration in Humid Climates
(American Society of Civil Engineers, 2003)Two equations for estimating grass reference evapotranspiration -
Two-Dimensional Basin Flow with Irregular Bottom Configuration
(American Society of Civil Engineers, 2003)Two-dimensional flow from a point or line source is simulated in an irrigated basin with a nonlevel soil surface; the goal is to predict the distribution uniformity of infiltrated depths. The zero-inertia approximation to ... -
Regional Water Management Modeling for Decision Support in Irrigated Agriculture
(American Society of Civil Engineers, 2003)Efficient water management is one of the key elements in successful operation of irrigation schemes in arid and semiarid regions. An integrated water management model was developed by combining an unsaturated flow model ... -
Effect of Lateral Water Surface Profile on Side Weir Discharge
(American Society of Civil Engineers, 2003)The average water surface slope in the lateral direction is taken into account as a local parameter ψ to study flow over a side weir. It was later shown that for smaller side weir lengths and side weir portions with no ...