Journal of Irrigation and Drainage Engineering: Recent submissions
Now showing items 3001-3020 of 3826
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Command Area Water Demands. I: Validation and Calibration of UCA Model
(American Society of Civil Engineers, 1994)Simulation of aggregate water demands by areas commanded by canal and lateral turnouts is an important input to the operation and management of the irrigation delivery system. A computer simulation model to predict these ... -
Brooks-Corey and van Genuchten Soil-Water-Retention Models
(American Society of Civil Engineers, 1995)In 1989 Lenhard et al. discussed a method for converting van Genuchten's 1980 soil-water-retention model into a simpler power-law model of the form proposed by Brooks and Corey in 1964. In this paper, the effect of this ... -
Air Entrapment and Water Infiltration in Two‐Layered Soil Column
(American Society of Civil Engineers, 1994)This study presents the experimental results of one‐dimensional unsaturated water infiltration under two conditions: vertical columns of homogeneous soil and vertical columns of two‐layered soil. The purpose was to more ... -
Seepage from Canal to Asymmetric Drainages
(American Society of Civil Engineers, 1994)In practice, canals located on ridges seldom have symmetric drainages on either side. In this paper, exact solution of the problem of seepage from a canal in a homogeneous medium to asymmetric drains located at finite ... -
Performance of Gunite Brow Ditches
(American Society of Civil Engineers, 1994)The main advantages of gunite brow ditches are cost, ease of construction, durability, and simple flow‐capacity equations. The main disadvantages are weakness due to shrinkage cracks; rigidity, which makes them vulnerable ... -
Transient Radius of Influence Model
(American Society of Civil Engineers, 1994)In the traditional analysis, the radius is defined as a constant radial distance beyond which the aquifer is undisturbed by the pumping of water from a well. In the real world, the radius is a transient variable. Its value ... -
Gully Erosion Minimization on Reclaimed Surface Mines Using SSAST Computer Model
(American Society of Civil Engineers, 1994)The Stable Slope and Sediment Transport (SSAST) model, an event‐based computer model, uses postmine hydrology and median overburden grain size of a reclaimed surface mine to calculate a stable slope for the longitudinal ... -
Normal‐Depth Equations for Irrigation Canals
(American Society of Civil Engineers, 1994)Normal depth is an important parameter occurring in the design of irrigation canals. Direct analytic solution of normal‐depth problems is not possible, as the governing equations for the practical canal sections are implicit. ... -
Modeling 3D Ground‐Water Flow by Modified Finite‐Element Method
(American Society of Civil Engineers, 1994)In this study, a number of theoretical improvements were made to the finite‐element formulation for modeling three‐dimensional steady and unsteady ground‐water flow. First, the Galerkin method was combined with the collocation ... -
Modeling Regional Flow and Flow to Drains
(American Society of Civil Engineers, 1994)Flow paths to drain laterals are needed to identify local flow to drains and regional flow. This paper describes the depths at which the flow paths of the regional aquifer‐flow system and the local saturated ground‐water‐flow ... -
Erratum:
(American Society of Civil Engineers, 1994) -
Two‐Dimensional Simulation of Basin Irrigation. I: Theory
(American Society of Civil Engineers, 1994)Overland flow of water over a porous bed in two spatial dimensions is governed by three partial differential equations accounting for continuity of momentum in the -
Two‐Dimensional Simulation of Basin Irrigation. II: Applications
(American Society of Civil Engineers, 1994)The development of a two‐dimensional hydrodynamic simulation model of basin irrigation is reported in a companion paper. This article presents four applications of the model. Two hypothetical case studies are used to ... -
Drawdowns for Leaky‐Aquifer Flow with Storage in Finite‐Width Sink
(American Society of Civil Engineers, 1994)One‐dimensional horizontal flow in a semi‐infinite confined aquifer can be described in terms of mathematical solutions that relate the drawdown to aquifer parameters and the aquifer flow rate. A new solution that considers ... -
Width and Depth‐Constrained Best Trapezoidal Section
(American Society of Civil Engineers, 1994) -
Discussion of “Holistic Approach to Irrigation Management in Developing Countries” by Phillip Z. Kirpich (March/April, 1993, Vol. 119, No. 2)
(American Society of Civil Engineers, 1994) -
Discharge Coefficient of Rectangular Side Weirs
(American Society of Civil Engineers, 1994)The characteristics of flow over side weirs are taken into account to determine the discharge coefficient for subcritical flow conditions under the assumption of constant‐specific energy. The main‐channel discharge, length ... -
Erratum:
(American Society of Civil Engineers, 1994) -
Soil Water Model for Evaluating Water Delivery Flexibility
(American Society of Civil Engineers, 1994)Performance of farm irrigation systems may be limited by water delivery system flexibility. A soil water storage simulation model (SWSSM) was developed to calculate daily soil water storage and corresponding evapotranspiration ... -
Infiltration‐Advance Equation for Finite Linear Source
(American Society of Civil Engineers, 1994)Several infiltration‐advance equations are developed for a finite linear source spreading water onto a smooth horizontal surface. These include ones for a noninfiltrating soil, one with a constant infiltration, and three ...