Journal of Irrigation and Drainage Engineering: Recent submissions
Now showing items 2621-2640 of 3826
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Analytical Solution for Normal Irrigation Distribution Parameters
(American Society of Civil Engineers, 2001)The model most widely used to represent sprinkler irrigation distribution parameters is based on numerical solutions to the normal cumulative probability density function. For most practical irrigation design and management ... -
Supercritical Flow in 45° Junction Manhole
(American Society of Civil Engineers, 2001)The flow in a junction manhole is analyzed using hydraulic modeling and a semiempirical approach. A large number of experiments was conducted to obtain insight in the complex hydraulic features of flows in either one or ... -
Managing Nitrate Problems for Domestic Wells in Irrigated Alluvial Aquifers
(American Society of Civil Engineers, 2001)Many irrigated areas in the United States and abroad overlie unconfined aquifers. The soils are coarse textured with low water-holding capacity, and irrigation water is frequently necessary for crop growth. Many of these ... -
Calculation of Inflow and Outflow in Phreatic Aquifers
(American Society of Civil Engineers, 2001)Computer algebraic routines are applied for determination of the phreatic surface from standard boundary-value problems for ordinary differential equations. The method does not require iterative steps as other methods do ... -
Revising the Cutthroat Flume Settlement Rating Adjustment Procedure
(American Society of Civil Engineers, 2001)A study was conducted to revise the procedure for adjusting discharge measurements in a cutthroat flume subjected to settlement in free-flowing conditions. A series of 57 tests was performed on six different size cutthroat ... -
Hydraulic Modeling of Kangsabati Main Canal for Performance Assessment
(American Society of Civil Engineers, 2001)Realizing the need for improvements in the operation and management of the main canal system through performance assessment, the MIKE 11 hydraulic model was applied to the Right Bank Main Canal system of the Kangsabati ... -
Explicit Volume Balance Model Solution
(American Society of Civil Engineers, 2001) -
Sediment Pickup on Streamwise Sloping Beds
(American Society of Civil Engineers, 2001)This paper presents an experimental investigation on noncohesive sediment pickup under a unidirectional steady-uniform stream flow on streamwise steeply sloping (down slope and adverse) sedimentary beds. The characteristic ... -
Drainage of Sloping Lands with Variable Recharge: Analytical Formulas and Model Development
(American Society of Civil Engineers, 2001)Semianalytical transient equations for shallow subsurface transverse drainage systems installed in sloping lands are developed. They provide a general relationship between drain flow rates, water table elevations, and ... -
Determining Irrigation Canal Seepage with Electrical Resistivity
(American Society of Civil Engineers, 2001)Procedures were developed and tested for quantifying seepage losses in unlined irrigation canals for reaches on the order of 100 ft (30 m). The procedure is appropriate for trapezoidal canal sections underlain by clay with ... -
Sediment Diversion through Irrigation Outlets
(American Society of Civil Engineers, 2001)To avoid sediment deposits in the downstream portion of irrigation channels, the outlets must extract a concentration equal to or higher than the one in the channel. In Pakistan, although channels have been designed in ... -
Improving Efficiency of Desalinization with Subsurface Drainage
(American Society of Civil Engineers, 2000)Desalinization of soils, by flooding the surface completely and leaching salts through subsurface drains, removes salts rapidly above the drains but only slowly midway between the drains. More uniform leaching using less ... -
Drainage Reduction under Land Retirement over Shallow Water Table
(American Society of Civil Engineers, 2001)The retirement of land from agricultural production as a means of reducing the volume of subsurface drainage generated in the Western San Joaquin Valley, Calif., is under consideration. Reticence among local farmers and ... -
Optimization-Based Simulation and Design of Tile Drainage Systems
(American Society of Civil Engineers, 2000)Optimization-based models for simulation of tile drainage systems are formulated and solved with a finite-difference approximated Richard's equation as an embedded constraint. The solution methodology minimizes the sum of ... -
Nitrate Electromigration in Sandy Soil: Closed System Response
(American Society of Civil Engineers, 2000)Contamination of surface and subsurface waters has become a major problem related to agricultural practices. Nitrate, one of the principal plant fertilizers, is the chemical having the greatest effect. This research utilized ... -
Simple Method for Confined-Aquifer Parameter Estimation
(American Society of Civil Engineers, 2000)Early drawdown data, for which the argument -
Optimal Design of Tapered Microirrigation Submain Manifolds
(American Society of Civil Engineers, 2000)An optimal design method for a drip submain manifold is presented. The optimal design is based on the shortest route algorithm for acyclic networks. Different route lengths are represented by total annual costs of different ... -
Water Reuse in Sequential Basin Irrigation
(American Society of Civil Engineers, 2000)Level basins, when properly designed and managed, often attain very high irrigation efficiencies. Problems can arise when the infiltrated depth exceeds the soil water holding capacity or when the crops are sensitive to ... -
Furrow Irrigation Performance under Spatially Varying Conditions
(American Society of Civil Engineers, 2000)A zero-inertia furrow irrigation model with specified space solution was used to investigate the effects of variability in furrow inflow rate and spatial variability in infiltration, geometry, and roughness on end-of-furrow ... -
Estimating Evaporation from Bare or Nearly Bare Soil
(American Society of Civil Engineers, 2000)A model is presented that uses a daily mean evapotranspiration