Journal of Irrigation and Drainage Engineering: Recent submissions
Now showing items 3481-3500 of 3826
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Head Loss in Manifolds Or Trickle Lateral: Simplified Approach
(American Society of Civil Engineers, 1989)Uniform distribution of water along a lateral or manifold is one of the primary objectives of a pressurized irrigation system designer. To design a system that will meet this objective requires establishing a relationship ... -
On the Correspondence between Brooks‐Corey and van Genuchten Models
(American Society of Civil Engineers, 1989)A procedure is described for converting van Genuchten (VG) saturation ( -
Editorial
(American Society of Civil Engineers, 1989) -
Discussion of “Green‐Ampt‐Model to Predict Surge Irrigation Phenomena” by M. A. Killen and D. C. Slack (November, 1987, Vol. 113, No. 4)
(American Society of Civil Engineers, 1989) -
Discussion of “<i>Characteristics of Square‐Edged and Round‐Nosed Broad‐Crested Weirs</i>” by Amruthur S. Ramamurthy, Udoyara S. Tim, and M. V. J. Rao (February, 1988, Vol. 114, No. 1)
(American Society of Civil Engineers, 1989) -
Research Needs in Irrigation and Drainage—1989
(American Society of Civil Engineers, 1989)The spatial applicability of current irrigation and drainage research, technological advancements, and institutional problems provide new research opportunities. The following is a research needs list developed by the ... -
LP Operation Model for On‐Demand Canal Systems
(American Society of Civil Engineers, 1989)A computer model was developed to assist watermasters in making the daily operating decisions required for irrigation water delivery systems which operate under flexible scheduling regimes. The objective of the model, which ... -
Infiltration Function from Furrow Stream Advance
(American Society of Civil Engineers, 1989)Average infiltration rates for large land areas can be quickly determined using a new procedure for obtaining the coefficients of the Kostiakov equation. By introducing the concept of the average opportunity time it is ... -
Stable Predictive Control of Open‐Channel Flow
(American Society of Civil Engineers, 1989)This paper presents an algorithm for automatic control of open‐channel flow. The design of a control algorithm is essentially conditioned by two features of the open‐channel dynamics: (1) The time‐inverse propagation process ... -
Time of Concentration Formula for Pervious Catchments
(American Society of Civil Engineers, 1989)An explicit formula is presented to determine the time of concentration of pervious, plane rectangular catchments. Unlike many existing empirical equations, the proposed formula expresses the time of concentration in terms ... -
Calculation of Distribution and Efficiency for Nonuniform Irrigation
(American Society of Civil Engineers, 1989)Nonuniform irrigation is considered along with an analysis of distribution, efficiency, and deep percolation. Analytical expressions are given for normal, lognormal, uniform, and “specialized power” distributions. Numerical ... -
Response of Muskingum Equation to Step Input
(American Society of Civil Engineers, 1989)Solution of the Muskingum equation for a step input function has been developed using the Laplace transform method. The solution is in agreement with a previous results, which was obtained by the author using a different ... -
River Quality Modeling: Time Domain Approach
(American Society of Civil Engineers, 1989)River quality and quantity variables such as specific conductance (SPC, μs/cm), total dissolved solids (TDS, mg/L), and daily mean discharge (DDM, -
Economic Impact of Micro Catchment Development
(American Society of Civil Engineers, 1989)In Sri Lanka, an island located near the southern tip of India, there are about 25,000 small reservoirs, commonly known as village tanks, whose irrigable area lies between 1 and 80 ha. About 50% of these tanks are abandoned ... -
Polynomial Regression to Forecast Earth Dam Piezometer Levels
(American Society of Civil Engineers, 1989)Polynomial regression to forecast earth dam piezometer levels gives a quadratic expression of the piezometer data variation versus reservoir level, which indicates a hysteresis of the piezometer measurements at mid‐reservoir ... -
Effect of Envelopes on Flow Pattern Near Drain Pipe
(American Society of Civil Engineers, 1989)Movements of soil particles in the vicinity of the drain lead to mineral clogging of drain pipes. It is therefore of high interest to analyze water flow patterns near the pipe in order to understand these movements. Two ... -
Urban Groundwater Rise Control: Case Study
(American Society of Civil Engineers, 1989)Seepage of wastewater from cesspools, and of leachate from green areas and parks, results in an annual groundwater rise of 0.5 m in Jeddah, Saudi Arabia. The rise causes several environmental and structural problems. A ... -
Future Irrigation Prospects and Actions in Developing Countries
(American Society of Civil Engineers, 1989)Irrigation has evolved as a major factor in commercial agriculture. However, the recent overproduction in the sector, combined with a restricted worldwide economy, has caused concern for users of many irrigation activities. ... -
Groundwater Table Simulation Under Different Rice Irrigation Practices
(American Society of Civil Engineers, 1989)Most rice culture in southern Asia occurs on relatively flat soils with seasonally high groundwater tables. Groundwater is often available for use during the dry season for irrigation. Bangladesh is a southern Asian country ... -
Gravity Irrigation Management in Bangladesh
(American Society of Civil Engineers, 1989)The management of rotational irrigation water distribution as practiced in Bangladesh could be improved. This study in the Ganges‐Kobadak irrigation project included fields in nine tertiary areas along three secondary ...