Journal of Irrigation and Drainage Engineering: Recent submissions
Now showing items 3301-3320 of 3826
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Surface‐Slope Effects on Sprinkler Uniformity
(American Society of Civil Engineers, 1991)The slope of the soil surface has a significant effect on water distribution from sprinklers. Field tests were conducted to quantify the effects. A ballistic trajectory model was developed to simulate precipitation data ... -
Simple Methods for Predicting Flow to Drains
(American Society of Civil Engineers, 1991)Flow to subsurface drain tubes was investigated using numerical solutions to the Richards equation for combined unsaturated and saturated flow. Solutions to three sets of problems involving steady infiltration and transient ... -
Simple Regression Procedure for Power Function
(American Society of Civil Engineers, 1991)A direct identification technique based on linear weighted regression analysis is presented to estimate the power function parameters. The computations required are simple, and a hand-held calculator might be sufficient. ... -
Optimal Spacing of Tube Wells in Relation to Channel Losses and Lining
(American Society of Civil Engineers, 1991)Considering different fixed and operating-cost components of water production, a mathematical model has been developed for optimum spacing of shallow tube wells in relation to channel lining and conveyance losses. The model ... -
Correction to Parshall Flume Calibrations at Low Discharges
(American Society of Civil Engineers, 1991)An inspection of the original study that developed the rating equations for Parshall flumes indicates that the calibration tests were not conducted for as low of flows as currently recommended for their use. An experimental ... -
Discussion of “<i>Effects of Deficit Irrigation and Irrigation Frequency on Wheat Yields</i>” by Marshall English and Brian Nakamura (April, 1989, Vol. 115, No. 2)
(American Society of Civil Engineers, 1991) -
DSS: Dam Site Selector Expert System for Education
(American Society of Civil Engineers, 1991)The dam site selector (DSS) expert system (ES) is an aid for rating an area for use as a dam site and reservoir. The program is not intended for rating sites where the dam height is greater than 50 ft (15.2 m), more than ... -
Optimal Design of Parabolic Canals
(American Society of Civil Engineers, 1991)This paper presents optimality conditions tor a parabolic‐eanal design accounting for freeboard and limitations on velocity and canal dimensions. Freeboard may be based on a design discharge or specified as a function of ... -
Methods of Measuring Pumpage Through Closed‐Conduit Irrigation Systems
(American Society of Civil Engineers, 1991)Methods of measuring volumes of water withdrawn from the Snake River and its tributaries and pumped through closed‐conduit irrigation systems were needed for equitable management of and resolution of conflicts over water ... -
Sediment‐Related Transport of Nutrients from Southwestern Watersheds
(American Society of Civil Engineers, 1991)Data from rainfall simulation experiments conducted in Arizona and New Mexico were used to identify relationships between total suspended sediment (TSS) concentrations (kg/ha/mm of runoff) in runoff and concentrations ... -
FAO‐24 Reference Evapotranspiration Factors
(American Society of Civil Engineers, 1991)Improved equations are presented tor calculating correction factors for the United Nations Food and Agriculture Organization Irrigation and Drainage Paper Number 24 (FAO‐24) grass reference evapotranspiration methods. ... -
Irrigation in Midwest: Lessons from Illinois
(American Society of Civil Engineers, 1991)Irrigation is becoming increasingly important in midwestern agriculture. Yet, since the Midwest has traditionally not been heavily irrigated, relatively little has been known about present irrigation water use and irrigation ... -
Furrow Geometric Parameters
(American Society of Civil Engineers, 1991)Furrow shape information is required for modeling and evaluating furrow irrigation. Currently used shape models assume the furrow perimeter is rigid so that only the flow depth increases with capacity. Actual furrow ... -
Fractal Concept Used in Time‐of‐Concentration Estimates
(American Society of Civil Engineers, 1991)In present hydrologic practice, it is generally recognized that the shallow overland sheet flow through the upper portions of a watershed is very slow, and that runoff gradually accelerates as it concentrates into gullies ... -
Salt Movement Under Level‐Basin Irrigation
(American Society of Civil Engineers, 1991)Level‐basin irrigation has been studied at two sites in western Colorado for seven years. This paper describes changes in the salinity profile in the root zone under level‐basin irrigation. On soils with initially low salt ... -
Irrigation Uniformity Relationships for Irrigation System Management
(American Society of Civil Engineers, 1991)For a given level of irrigation uniformity there is a trade‐off between the amount of water applied and the area that receives some target amount of water. If the distribution of infiltrated depth is known (e.g., a normal ... -
Runoff Curve Numbers for Reclaimed Surface Mines in Pennsylvania
(American Society of Civil Engineers, 1991)The Surface Mining Control and Reclamation Act of 1977 requires evaluation of pre‐ and postmining hydrology for design of runoff and sediment control structures on mined land. The runoff‐curve‐number (CN) method as developed ... -
Kriging of Hydraulic Conductivity for Subsurface Drainage Design
(American Society of Civil Engineers, 1991)Hydraulic conductivity is an important parameter in the design of subsurface drainage systems. Hydraulic conductivity from field investigations in alluvial soils shows a high spatial variability. The objective of this study ... -
Discussion of “<i>Response of Muskingum Equation to Step Input</i>” by Mohammad Akram Gill (August, 1989, Vol. 115, No. 4)
(American Society of Civil Engineers, 1991) -
Discussion of “<i>On the Correspondence between Brooks‐Corey and van Genuchten Models</i>” by R. J. Lenhard, J. C. Parker, and S. Mishra (August, 1989, Vol. 115, No. 4)
(American Society of Civil Engineers, 1991)