Journal of Irrigation and Drainage Engineering: Recent submissions
Now showing items 3161-3180 of 3826
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Stochastic Design of Hydraulic Structures in Irrigation Canal Networks
(American Society of Civil Engineers, 1993)A methodology is presented for optimal design of hydraulic structures in a branched irrigation canal network subject to parametric and objective uncertainty. Monte Carlo simulation of steady spatially varied flow is ... -
Hydraulics of Irrigation Laterals: Comparative Analysis
(American Society of Civil Engineers, 1993)A differential approach is applied to multiple outlet pipes with constant and continuously variable outflow. This approach simulates pressure distributions along uniform sprinkle and trickle irrigation laterals and manifolds, ... -
Movement of Ground Water in Converging Aquifer
(American Society of Civil Engineers, 1993)An analytical solution for regional flow in a converging or wedge‐shaped aquifer is given. Darcy's law and the continuity equation, expressed in cylindrical coordinates, were solved for flow in a vertical cross section ... -
Control Method for On‐Demand Operation of Open‐Channel Flow
(American Society of Civil Engineers, 1993)The basic unit in a free‐surface controlled water distribution network could be composed by a single reach with upstream and downstream gates. Different methods have been proposed in the literature to control water level, ... -
Identification of Furrow Intake Parameters from Advance Times and Rates
(American Society of Civil Engineers, 1993)This paper analyzes the convergence of a numerical model for the quantification of lumped furrow infiltration parameters. The model minimizes the squared difference of observed and model‐predicted advance times as a function ... -
Recycling Drainage Water in San Joaquin Valley, California
(American Society of Civil Engineers, 1993)The disposal of saline drainage wastewater in agricultural fields, mainly in arid and semiarid regions, is a problem that has plagued farmers, researchers, and decision‐makers. The problem has received increased attention ... -
Strength of Bentonite Water‐Well Annulus Seals in Confined Aquifers
(American Society of Civil Engineers, 1993)The advantages of bentonite clay for sealing applications are well known. Bentonites have extremely low permeability, do not affect formation water chemistry, and have the ability to swell and deform in response to subsurface ... -
Numerical Calculation of Infiltration in Furrow Irrigation Simulation Models
(American Society of Civil Engineers, 1993)The computation of wetted‐perimeter‐dependent intake in a furrow irrigation simulation model using an empirical infiltration formula was examined. Different formulations were applied under increasing and decreasing depth ... -
Water Management in Arranged‐Demand Canal
(American Society of Civil Engineers, 1993)Irrigation water‐management characteristics within the command area of an arranged‐demand irrigation canal were examined, including on‐farm scheduling practices. Supply/demand ratios were used as the key indicators for ... -
Discharge Prediction in Smooth Trapezoidal Free Overfall—(Positive, Zero and Negative Slopes)
(American Society of Civil Engineers, 1993)This paper presents a calibration curve using dimensionless parameters -
Changes in Subsurface Drainage Water Salinity and Boron Concentrations
(American Society of Civil Engineers, 1993)The electrical conductivity (salinity) and boron concentrations of subsurface agricultural drainage effluent are analyzed. The effluent is from drainage systems ranging from 0 to 40 years of age, located on irrigated saline ... -
Computation of Flow Transitions in Open Channels with Steady Uniform Lateral Inflow
(American Society of Civil Engineers, 1993)A numerical procedure is developed for quickly and accurately finding the location and flow depth of a flow transition (critical control section) in open channels with discharge gradually varying along the channel length. ... -
DACL System Dynamic Performance. II: Laboratory Model Testing
(American Society of Civil Engineers, 1993)This paper examines the dynamic performance of the dual‐acting controlled‐leak (DACL) system. The methodology and results of tests conducted on a DACL laboratory model configured for downstream control are reported. ... -
Spatial and Seasonal Variation of Furrow Infiltration
(American Society of Civil Engineers, 1993)Infiltration was measured with a newly developed flow‐through infiltrometer at 20–27 sites in a 21 ha (52‐acre) cotton field in the northern region of the San Joaquin Valley of California. The results were comparable with ... -
Application of SHE for Irrigation‐Command‐Area Studies in India
(American Society of Civil Engineers, 1993)One of the key topics in irrigation engineering today is water management in irrigated command areas. This paper presents application of a comprehensive modeling approach based on the Système Hydrologique Européen (SHE), ... -
Erratum:
(American Society of Civil Engineers, 1993) -
Discussion of “Interactive Computer‐Aided Design of Inverted Siphons” by Pravi Shrestha and Johannes J. DeVries (March/April, 1991, Vol. 117, No. 2)
(American Society of Civil Engineers, 1993) -
DACL System Dynamic Performance. I: Response‐Prediction Analysis
(American Society of Civil Engineers, 1993)This paper examines the dynamic performance of the dual‐acting controlled‐leak (DACL) system for automating radial gate control. The dynamic performance of the DACL open‐channel level‐control system has been analyzed using ... -
Comprehensive Open‐Channel Expansion Transition Design
(American Society of Civil Engineers, 1993)Open‐channel transitions involving an expansion of width are a common feature of canals and flumes. Subcritical flow through an expansion transition can result in significant head loss due to separation of flow and subsequent ... -
Sprinkler Droplet Effects on Infiltration. II: Laboratory Study
(American Society of Civil Engineers, 1993)A companion paper by Chang and Hills, 1992, describes the stress distribution in a soil surface during water droplet impact according to a numerical simulation model. This project was undertaken to relate field data to the ...