Journal of Irrigation and Drainage Engineering: Recent submissions
Now showing items 3741-3760 of 3826
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V‐Shaped Short‐Crested Weir With Semicircular Cross Section
(American Society of Civil Engineers, 1984)The v‐shaped short‐crested weir with a semicircular cross section is used to measure discharges in open channels. Its truncated triangular shape provides a rather wide measuring range. Data obtained from laboratory experiments ... -
Management Contours for Border Irrigation
(American Society of Civil Engineers, 1984)A present capability exists for analysis of a border irrigation by the use of mathematical models of the process or by the use of curves representing generalized dimensionless results thereof. The corresponding synthesis, ... -
Normalized Graphs of Border‐Irrigation Performance
(American Society of Civil Engineers, 1984)Good irrigation management requires the ability to predict the outcome of any given combination of field and management parameters—soil infiltration characteristics, border length, slope and roughness, and inflow rate and ... -
New Approach for Analysis of Aquifer‐Test Data
(American Society of Civil Engineers, 1984)A new approach for the analysis of aquifer test data for confined nonleaky aquifers is presented. An implicit function theorem is used to estimate the transmissivity and storage coefficient from intersecting graphs, which ... -
Economic Considerations of Deficit Irrigation
(American Society of Civil Engineers, 1984)The factors related to potential yields of crops are briefly described. The most important are water, fertility, and available energy as measured by the evaporative potential. Mathematical yield models are presented relating ... -
Infiltration from Trickle Irrigation Source
(American Society of Civil Engineers, 1984)The two‐dimensional nonlinear partial differential equation that describes the transient movement of water in an unsaturated porous medium is investigated by using the zero‐order continuous linear finite element method. ... -
Modeling Effect of Depth on Furrow Infiltration
(American Society of Civil Engineers, 1984)In contrast to borders, water depth in furrows has a primary influence on infiltration. If flow depth remains relatively constant everywhere and infiltration parameters are measured at that depth, volume infiltrated per ... -
Data Requirement for Evapotranspiration Estimation
(American Society of Civil Engineers, 1984)Various approaches based on climatological data (CD) have been used to estimate evapotranspiration (ET). A multiple regression with ordinary least square analysis (OLS) has been commonly used to assess the relatively ... -
Evapotranspiration under Extremely Arid Climates
(American Society of Civil Engineers, 1984)Based on Jensen‐Haise's formula, an equation is recommended for predicting reference evapotranspiration (ETR) under extremely arid conditions. This equation is reached by comparing and evaluating selected estimation methods ... -
Mapping Average Daily Pan Evaporation
(American Society of Civil Engineers, 1984)Voluminous data on monthly averages of Class A pan evaporation can be described concisely by mapping the parameters of Fourier series describing the seasonal variations. Average monthly Class A pan evaporation data were ... -
Parabolic Canal Design and Analysis
(American Society of Civil Engineers, 1984)Advantages and disadvantages of the parabolic canals are described. Procedures are given for determining all design parameters for parabolic cross-sections. The changes in velocity, area and wetted perimeter depand on ... -
Three‐Dimensional Model of a Skimming Well
(American Society of Civil Engineers, 1984)A skimming well is a partially penetrating well in a thin unconfined layer of fresh water which overlies saline water in an aquifer. A three‐dimensional, unconfined, transient miscible flow model of skimming well operation, ... -
Concepts for Energy‐Efficient Irrigation System Design
(American Society of Civil Engineers, 1984)Both old and new design and management concepts for increasing irrigation and energy‐use efficiencies and net farm profits should be integrated into current and new system designs. Computerized procedures are available for ... -
Discussion of “<i>Estimation of FAO Evapotranspiration Coefficients</i>” by Donald K. Frevert, Robert W. Hill, and Bruce C. Braaten (June, 1983)
(American Society of Civil Engineers, 1984) -
Erratum: “Drought Analysis and Soil Moisture Prediction” by Graeme M. Smart (June, 1983)
(American Society of Civil Engineers, 1984) -
Optimal Channel Cross Section with Freeboard
(American Society of Civil Engineers, 1984)Methods from calculus may be used to determine a channel cross section which minimizes hydraulic resistance or alternatively, determines the least cost channel dimensions. In either case, established procedures ignore ... -
Impact of Water Degradation on Regional Agricultural Economy
(American Society of Civil Engineers, 1984)The problem of increasing ground water salinity in areas irrigated by ground water has been studied; however, few if any measures have been implemented to control the salinity build‐up. One reason for this inaction may be ... -
Corrugated Pipe Flow Rate from Pipe Geometry
(American Society of Civil Engineers, 1984)Corrugated plastic drainage tubing has been available in North America for only 15 years. It now represents 75% of the drainage pipe used in agriculture for subsurface drainage. Hydraulic tests are available for diameters ... -
Monthly Evaporation for Milford Lake in Kansas
(American Society of Civil Engineers, 1984)A weekly evaporation time series generated by the mass transfer method for Milford Lake displays a predominant annual cycle with low evaporation in spring and winter and high evaporation in summer and fall. A mathematical ... -
Model and Production Function for Irrigation Management
(American Society of Civil Engineers, 1984)A simulation model was developed to estimate the effect of deficit irrigation upon crop yield. The model was designed to provide relative yield estimates for numerous combinations of irrigation system, crop growth and ...