Journal of Irrigation and Drainage Engineering: Recent submissions
Now showing items 2721-2740 of 3826
-
Theory of Pipe Drainage Assisted by Mole Drainage
(American Society of Civil Engineers, 1999) -
Response of ASCE Task Committee Test Cases to Open-Loop Control Measures
(American Society of Civil Engineers, 1999)Automated open- and closed-loop control systems can enhance the performance of irrigation delivery systems. This paper examines the response of the canal test cases developed by the ASCE task committee on canal automation ... -
Modeling Water Uptake by Plant Roots
(American Society of Civil Engineers, 1999)A mathematical model is developed that describes water uptake from soil by the roots of transpiring plants. Starting from a one-dimensional Richards equation with a root water extraction term, a partial differential equation ... -
LEPA and Spray Irrigation for Grain Crops
(American Society of Civil Engineers, 1999)Two low energy precision application (LEPA) sprinkler methods (double-ended socks and bubblers) and two spray sprinkler methods (low-elevation spray application and overhead spray) were used to irrigate corn, grain sorghum, ... -
Semiempirical Infiltration Equation for Furrow Irrigation Systems
(American Society of Civil Engineers, 1999)A semiempirical equation for cumulative infiltration in a furrow irrigation system was developed using an empirical wetting front advance equation and a volume balance technique. This equation was verified using the field ... -
Offtake Sensitivity, Operation Effectiveness, and Performance of Irrigation System
(American Society of Civil Engineers, 1999)Analytical relationships between the control of canal water depth, the sensitivity of irrigation delivery structures, and the resulting internal performance are established at the system level. One system sensitivity ... -
Effective Hydraulic Conductivity for Partially Saturated Porous Media
(American Society of Civil Engineers, 1999)In this paper a method of obtaining the effective hydraulic conductivity for partially saturated porous media is proposed. The governing moisture transport equation was modified by introducing a velocity term to make it ... -
Baffle Sluice Modules with Improved Performance
(American Society of Civil Engineers, 1999)This work demonstrates the applicability of more generalized sluice gate equations to the design of baffle sluice modules. The generalized equations allow the module to be designed for any upstream head. These equations ... -
Regional Regression Models of Annual Streamflow for the United States
(American Society of Civil Engineers, 1999)Estimates of annual streamflow volumes are needed in many different types of hydrologic studies. Usually a streamgauge is unavailable at the location of interest, hence regional methods that relate streamflow to readily ... -
Irrigation Performance Measures: Efficiency and Uniformity
(American Society of Civil Engineers, 1999) -
Economics of Furrow Irrigation under Partial Infiltration Information
(American Society of Civil Engineers, 1999)The effects of partial infiltration and furrow geometry information on furrow irrigation design and economic return to water were quantified on a single furrow (reference furrow) and field-wide (10-furrow set) basis using ... -
Development of Management Models for Sustainable Use of Coastal Aquifers
(American Society of Civil Engineers, 1999)A number of nonlinear optimization-based multiple-objective management models for sustainable utilization of coastal aquifers are formulated and solved. The management objectives represent plausible scenarios for planned ... -
Vadose Zone Flow and Transport in Cracked Heavy Textured Soil
(American Society of Civil Engineers, 1999)Investigated were physical processes governing vadose zone water flow and solute transport in a heavy-textured crack-prone soil of the semiarid Canadian Prairies. Soil moisture, soil temperature, and relevant meteorological ... -
Estimation of Hydraulic Diffusivity in Stream-Aquifer System
(American Society of Civil Engineers, 1999)The Laplace transform of convolution equation, which relates aquifer response to boundary perturbation, expresses explicitly the hydraulic diffusivity in terms of the Laplace transform parameter, changes in stream stage, ... -
Irrigation Offtake Sensitivity
(American Society of Civil Engineers, 1999)This article is an attempt to develop an analytical framework to address sensitivity of irrigation offtakes. The perturbation of water depth and the deviation of the setting are considered for analysis. Sensitivity of ... -
Adjusting Temperature Parameters to Reflect Well-Watered Conditions
(American Society of Civil Engineers, 1999)Adjustment coefficients for air temperature and dew point temperature measurements at dry weather sites are determined for predicting reference evapotranspirations (ET -
Factor <i>G</i> for Pipelines with Equally Spaced Multiple Outlets and Outflow
(American Society of Civil Engineers, 1999)A factor -
Theoretical End-Depth-Discharge Relationship for Free Overfall
(American Society of Civil Engineers, 1999)Despite the many theoretical and experimental studies carried out in channels having different cross-section shape, slope, and roughness, the problem of the free overfall as a flow measuring device has not been completely ... -
Nitrate Electromigration in Sandy Soil in the Presence of Hydraulic Flow
(American Society of Civil Engineers, 1999)Chemicals applied to agricultural lands inevitably move below the plant root zone and may contaminate the underlying ground-water reservoirs. Laboratory open system soil column experiments were conducted to evaluate ... -
Estimation of Global Irrigation Distribution Uniformity
(American Society of Civil Engineers, 1999)