Journal of Irrigation and Drainage Engineering: Recent submissions
Now showing items 3221-3240 of 3826
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Calibrating SHE Soil‐Erosion Model for Different Land Covers
(American Society of Civil Engineers, 1992)Calibration of the rainfall and overland flow erodibility coefficients of a physically based erosion and sediment yield component for the Système Hydrologique Européen (SHE) modeling system is demonstrated using data from -
Computation Method for Regulating Unsteady Flow in Open Channels
(American Society of Civil Engineers, 1992)Unsteady flow problems in open channels can be classified as simulation‐ and operation‐type problems, according to the objectives of the study. The simulation problem is for predicting the discharge and water level in the ... -
Flow Capacity Through Wide and Submerged Vegetal Channels
(American Society of Civil Engineers, 1992)The presence of vegetation in irrigation canals in Egypt after the Aswan dam was built has become considerable problem in irrigation system. Many irrigation canals were designed by applying the common Manning's equation, ... -
Prediction of Natural Channel Hydraulic Roughness
(American Society of Civil Engineers, 1992)Most of the available methods for roughness prediction assume that the flow is steady and uniform, and many of them are laboratory-oriented and lack verification with field data. Three existing roughness prediction formulas ... -
Discussion of “<i>Problems and Potential of Irrigated Agriculture in Sub‐Saharan Africa</i>” by Mahmood Alam (March/April, 1991, Vol. 117, No. 2)
(American Society of Civil Engineers, 1992) -
Transients in Canal Network
(American Society of Civil Engineers, 1992)A study is made of transients in canal networks using a mathematical model based on St. Venant equations. The transient effects of different combinations of types, location, and operation of control structures are studied. ... -
Drawdowns for Nonleaky Aquifer Flow with Storage in Finite‐Width Sink
(American Society of Civil Engineers, 1992)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 analytical solution, ... -
Design and Operation of On‐Farm Irrigation Ponds
(American Society of Civil Engineers, 1992)On‐farm storage facilities can be useful in satisfying the variable diurnal irrigation demand during a day and, at the same time, can prevent waste of water. In this study, an irrigation pond (IP) model is developed for ... -
Critical Depth Relations for Flow Measurement Design
(American Society of Civil Engineers, 1992)Long-throated flumes and broad-crested weirs are becoming widely used for open-channel flow measurement, primarily because of their simplicity and numerical predictability. These flumes and weirs are constructed such that ... -
Seepage Optimization for Trapezoidal Channel
(American Society of Civil Engineers, 1992)A complex‐variable method and series expansions are applied to optimal‐shape design problems for a channel bed. A dimensionless depth of a trapezoidal and rectangular channel is determined by minimizing the cost function ... -
Analysis of Evaporative Flux Data for Various Climates
(American Society of Civil Engineers, 1992)Estimation of evapotranspiration is a key requirement of hydrologic balance studies and climate analysis. The study reported involved collection of precise weighing lysimeter and meteorological data from three sites ... -
Beginning of Motion for Selected Unanchored Residue Materials
(American Society of Civil Engineers, 1992)Conservation tillage systems help to maintain residue materials from the previous crop on the soil surface. The potential for serious erosion may exist if crop residues are removed by overland flow. This study is conducted ... -
High Frequency Basin Irrigation Design for Upland Crops in Rice Lands
(American Society of Civil Engineers, 1992)Rice soils are generally characterized by heavy textures, poor structures, low porosities and permeabilities, shallow traffic pans, and slow rates of drainage. Crop growth and yields of upland (i.e., nonrice) crops in these ... -
Analysis of Recharge in Anisotropic, Layered, Saturated‐Unsaturated Soil
(American Society of Civil Engineers, 1992)A numerical investigation of artificial recharge in multilayered, anisotropic, unconfined porous media is performed for radial flow configuration. The numerical studies, carried out with a saturated‐unsaturated flow model, ... -
Automated Operation of Pumping Stations in Soviet Union
(American Society of Civil Engineers, 1992)One of the problems in high capacity pumping stations (called -
Alluvial Canals Adequacy
(American Society of Civil Engineers, 1992)Canal adequacy, identified with discharge accuracy and the ability to convey that discharge, is investigated. Calibration techniques for canal design criteria are proposed using field data. The data are from two stable ... -
Stochastic Model for Soil Moisture Deficit in Irrigated Lands
(American Society of Civil Engineers, 1992)The growth of plants in an irrigated area is described as healthy or unhealthy, a two‐state process that depends on the moisture status of the soil. Probability distributions of the soil moisture deficit (SMD) and the ... -
Estimation of Daytime Net Radiation Over Well‐Watered Grass
(American Society of Civil Engineers, 1992)Net radiation -
Discussion of “<i>Evapotranspiration in Sudan Gezira Irrigation Scheme</i>” by Ahmed S. A. Hussein and Ahmed K. El Daw (January/February, 1990, Vol. 115, No. 6)
(American Society of Civil Engineers, 1992) -
Closure to “<i>Unsteady Drawdown of Water Table</i>” by M. Emin Savci (July/August, 1990, Vol. 116, No. 4)
(American Society of Civil Engineers, 1992)