Journal of Irrigation and Drainage Engineering: Recent submissions
Now showing items 2821-2840 of 3826
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Solute Transport in Simulated Conductivity Fields under Different Irrigations
(American Society of Civil Engineers, 1997)The interactive effect of irrigation methods and spatial variability of saturated hydraulic conductivity ( -
Surface Irrigation Advance Equation: Variation of Subsurface Shape Factor
(American Society of Civil Engineers, 1997)The volume balance (VB) algebraic equations based on the power advance assumption (i.e., the time invariance of the subsurface shape factor) may deviate significantly from accurate VB numerical solutions. By systematic ... -
Bottom Outlet for Sewers
(American Society of Civil Engineers, 1997)The bottom opening is a standard structure in storm sewers, provided the approach flow is supercritical. Based on extended experimentation and by using the governing flow equations, the hydraulic characteristics of bottom ... -
Analytical Estimation of Modified Penman Equation Parameters
(American Society of Civil Engineers, 1997)The mathematical expression of the modified Penman equation requires values for the adjustment factor -
IPE: Model for Management and Control of Furrow Irrigation in Real Time
(American Society of Civil Engineers, 1997)Infiltration parameter estimation (IPE) is a simulation model of furrow irrigation that allows us to estimate infiltration parameters in real time. The model calculates infiltration parameters from measured advance times ... -
Idealized Automated Control of Sloping Canals
(American Society of Civil Engineers, 1997)An investigation of the automated, downstream control of sloping-top canals using an idealized controller is presented here. The case for an idealized formulation of canal control is given and a simplified, idealized control ... -
Seepage from Canals with Infiltration from Free Surface Zone
(American Society of Civil Engineers, 1997)An analytical solution is obtained for estimation of seepage from a canal to symmetrically placed drainages founded on infinite pervious soil medium with uniform infiltration from the free surface zone. Integral equations ... -
Radial Flow Modeling for Estimating Level-Basin Irrigation Parameters
(American Society of Civil Engineers, 1997)Previous research in the estimation of surface irrigation parameters from advance time or surface profile observations has focused on the development of solutions for parallel surface flow conditions. This study was conducted ... -
Effectivity of Multiple Sheet Piles in Weir Design
(American Society of Civil Engineers, 1997)As a protection measure against scour and undermining, sheet piles are provided at the upstream and the downstream ends of a weir. One or two rows of intermediate sheet piles are also provided to reduce the uplift pressures ... -
Ground-Water Mound Equation for Rectangular Recharge Area
(American Society of Civil Engineers, 1997)Artificial recharge of the ground-water table from rectangular basins has been the subject of extensive study in the last 30 years. Although, for finite aquifers, the ground-water mound profile can be accurately predicted, ... -
Comparison and Calibration of Canal Gate Automation Algorithms
(American Society of Civil Engineers, 1997)Several canal gate automation methods and devices were selected for comparison and analysis. Algorithms that simulate gate operation were developed for the P+PR, BIVAL, Littleman, Colvin, Zimbelman, CARDD, and UMA methods. ... -
Evaluation of Time-Rated Infiltration Families for Noncracking Soils
(American Society of Civil Engineers, 1997)The time-rated infiltration families proposed by Merriam and Clemmens were further developed and evaluated using infiltration data for noncracking soils. Infiltration experiments were monitored, using a double-ring ... -
Geohydrologic Effects on Drainwater Quality
(American Society of Civil Engineers, 1997)This study was conducted on the water-district scale and provides insight into the effects of percolating irrigation water, local ground water, and regional ground water on the quantity and quality of drainwater from on-farm ... -
Control of Water Levels in the Meuse River
(American Society of Civil Engineers, 1997)This paper presents a water-level control system for the Meuse river, the implementation of which is planned to start in 1997. A simplified model is used for the tuning of and design of the controllers. To obtain a highly ... -
Mobile Prisms for Flow Measurement in Rectangular Channels
(American Society of Civil Engineers, 1997)Flow measurement (both temporary and continuous) in rectangular irrigation channels, sewers or drains, can easily be carried out quickly using measuring flumes. This study presents a particular kind of measuring flume, ... -
Water Quality as Design Criterion in Drainage Water Management Systems
(American Society of Civil Engineers, 1997)In the past, irrigation and drainage systems were designed and managed as separate entities. As water supplies become scarce and environmental restrictions increase, there will be a demand for the integrated design and ... -
Relative Performances of Textural Models in Estimating Soil Moisture Characteristic
(American Society of Civil Engineers, 1997)The soil moisture characteristic (SMC) forms an important input to mathematical models of water and solute transport in the unsaturated-soil zone. Owing to their simplicity and ease of use, texture-based regression models ... -
Comparative Field Performance of Subdrainage Systems
(American Society of Civil Engineers, 1997)Long-term pavement performance in wet climates is directly related to the amount, extent, and duration of internal moisture. Retention of moisture in base/subbase layers can lead to damage and premature failure of the ... -
Irrigation with Marginal Quality Waters: Issues
(American Society of Civil Engineers, 1997)Due to increasingly stringent regulations on the discharge of wastewaters as well as the decreasing availability of freshwater resources, there is a need to consider the expanded use and reuse of marginal quality waters ... -
Applying Hypothesis of Self-Similarity for Flow-Resistance Law of Small-Diameter Plastic Pipes
(American Society of Civil Engineers, 1997)In this paper the writer reports the results of an investigation carried out to test the applicability of the self-similarity hypothesis for determining the flow-resistance law in small-diameter plastic pipes. The incomplete ...