Journal of Irrigation and Drainage Engineering: Recent submissions
Now showing items 2701-2720 of 3826
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Kostiakov Infiltration Parameters from Kinematic Wave Model
(American Society of Civil Engineers, 1999) -
Optimal Allocation of Irrigation Water Supplies in Real Time
(American Society of Civil Engineers, 1999)This paper presents an evaluation of the potential of an optimization approach in improving real-time irrigation water management in systems with complex distribution networks. The optimization approach is based on quadratic ... -
Long-Term Evapotranspiration from Coastal Avocado/Citrus Orchard
(American Society of Civil Engineers, 2000)Very limited citrus and avocado orchard evapotranspiration data are available, and practically no published information is available considering citrus/avocado evapotranspiration -
Explicit Volume Balance Model Solution
(American Society of Civil Engineers, 1999)The volume balance model was modified to allow explicit solution for the advance distance in surface irrigation. In a dimensionless formulation, the advance distance equation was compared with the correct form of the Hall ... -
Analytical Modeling of Nitrogen Dynamics in Soils and Ground Water
(American Society of Civil Engineers, 1999)An analytical model, known as RISK-N, is developed to simulate nitrogen cycling in soils, and nitrate transport and fate in soils and ground water. The soil is separated into upper-root, lower-root, and intermediate-vadose ... -
Friction Correction Factors for Center-Pivots
(American Society of Civil Engineers, 1999)Analytical equations for friction correction factors for center-pivot laterals without end guns are developed. This work illustrates a discrepancy when earlier equations are applied to center-pivots with small numbers of ... -
Modeling of Irrigation and Drainage Canals for Controller Design
(American Society of Civil Engineers, 1999)Schuurmans et al. (1995a) presented a model for the design of water level controllers for irrigation and drainage canals that describes the essential characteristics of the processes relevant for canal control (such as ... -
Control of Canal Flow by Adjoint Sensitivity Method
(American Society of Civil Engineers, 1999)A new method for control of unsteady flow in open channels is presented. Control is achieved using an iterative approach, the Broyden, Fletcher, Goldfarb, and Shanno quasi-Newton method that utilizes an adjoint sensitivity ... -
Sewer Sideweir with Throttling Pipe
(American Society of Civil Engineers, 1999)Sewer sideweirs in a combined sewer system are used for diversion of excess discharge during rainfalls. Their hydraulic performance depends significantly on the approach Froude number, the relative weir height, and the ... -
Sediment Removal Efficiency of Settling Basins
(American Society of Civil Engineers, 1999)Experimental investigations have been carried out on the sediment removal efficiency of settling basins. Laboratory data on removal efficiency from the present and earlier studies were first used for checking the accuracy ... -
Infiltration Considerations for Ground-Water Recharge with Waste Effluent
(American Society of Civil Engineers, 1999)Water reuse and ground-water recharge can be used to meet the growing demands for water, particularly in arid regions. Ground-water recharge using fresh water or treated wastewater is most often accomplished by infiltration ... -
Modeling of Evaporation Reduction in Drip Irrigation System
(American Society of Civil Engineers, 1999)Surface drip irrigation is an efficient system for delivering water to crops; however, conditions at the soil surface affect evaporation rate and efficiency. A method is proposed, sand tube irrigation (STI), to increase ... -
Single-Layer Evapotranspiration Model with Variable Canopy Resistance
(American Society of Civil Engineers, 1999)A new approach to modeling canopy resistance is presented as an alternative to the Food and Agricultural Organization of the United Nations Penman-Monteith method with the constant canopy resistance. The evapotranspiration ... -
Simple Water Level Controller for Irrigation and Drainage Canals
(American Society of Civil Engineers, 1999)A simple water level controller for irrigation and drainage canals is proposed; the proposed controller has a master-slave structure where the slaves control the flow rates through the control structures. The master ... -
Transient Drainage to Partially Penetrating Drains in Sloping Aquifers
(American Society of Civil Engineers, 1999)The nonlinear Boussinesq unsteady-state differential equation used for evaluating drainage of sloping lands with drains lying at a distance above the impermeable layer was solved. A combination of explicit and implicit ... -
Analytical Ground-Water Flow Solutions for Channel-Aquifer Interaction
(American Society of Civil Engineers, 1999)A general solution scheme for determining ground-water levels for channel/group-water systems with recharge is developed and verified. The analytical solution uses the Laplace transform method to solve a linearized form ... -
Nitrate Dynamics under Cyclic Irrigation Pumpage
(American Society of Civil Engineers, 1999)Large-scale nitrate contamination of ground water is often observed in irrigated areas where the soils are generally permeable, and nitrate plumes have been reported to occur at shallow depths in unconfined aquifers. It ... -
Modeling Hydrological Processes in Hillslope Watershed of Humid Tropics
(American Society of Civil Engineers, 1999)Hydrological studies were conducted in a lateritic hillslope watershed of Kerala, a humid tropical region in India. The watershed characteristics, soil moisture properties, and hydrological processes were evaluated. The ... -
Modeling Sorption Behavior of Atrazine on Intact Soil Columns
(American Society of Civil Engineers, 1999)The sorption behavior of atrazine (2-chloro-4-ethylamino-6-isopropylamino- -
Measuring Irrigation Well Discharges
(American Society of Civil Engineers, 1999)Irrigation wells frequently discharge directly into canals. Upstream elbows, the pump head, or other pipe fittings may produce a distorted flow profile that is detrimental to the proper installation and operation of commonly ...