Journal of Irrigation and Drainage Engineering: Recent submissions
Now showing items 3041-3060 of 3826
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Furrow Advance‐Rate Solution for Stochastic Infiltration Properties
(American Society of Civil Engineers, 1994)A flow‐balance equation of surface irrigation is used to solve, section by section, the advance problem on heterogeneous soils. The advance‐linear‐velocity (ALIVE) solution as a function of time is a sum of exponential ... -
Hydraulic Conditions Required to Move Unanchored Residue Materials
(American Society of Civil Engineers, 1994)Hydraulic conditions required to initiate movement of unanchored residue materials are identified in the present study. Selected amounts of corn, cotton, pine needles, sorghum, soybean, sunflower, and wheat residue are ... -
Analysis and Design of Sprinkler Irrigation Laterals
(American Society of Civil Engineers, 1994)This paper addresses a new design technique for sprinkler irrigation laterals with equally spaced sprinklers and constant longitudinal slope. The technique uses the Darcy‐Weisbach friction formula and accounts for the ... -
Water Balance of Blue Nile River Basin in Ethiopia
(American Society of Civil Engineers, 1994)The Blue Nile River in Ethiopia has a drainage area of approximately 324,530 km -
Drain‐Spacing Calculation Considering Influence of Evaporation
(American Society of Civil Engineers, 1994)This paper holds that the widely used equations -
Design of Open‐Channel‐Contraction Tranisitions
(American Society of Civil Engineers, 1994)Open-channel contractions for subcritical flows are encountered in the design of many hydraulic structures in which flow is flumed for reasons of economy. In all the works associated with fluming of canals, suitable ... -
Transmission Losses from Ephemeral Stream in Arid Region
(American Society of Civil Engineers, 1994)Quantification of transmission loss was estimated through a mass-water-balance approach that accounts for the influence of tributary-runoff contribution and evaporation loss in a typical arid catchment in Southwestern Saudi ... -
Using Cavity Well to Determine Aquifer Thickness and Constants
(American Society of Civil Engineers, 1994)A simple mathematical approach is presented for using a cavity well to determine aquifer constants like hydraulic conductivity -
Optimization Analysis of Deficit Irrigation Systems
(American Society of Civil Engineers, 1994)In the present paper the use of mathematical programming theory is proposed to define optimization criteria for the deficit irrigation of an area. A first application, which was carried out on a sample farm in the Upper ... -
Seasonal Distributions of Peak Flows from Small Agricultural Watersheds
(American Society of Civil Engineers, 1994)Knowledge of seasonal distributions of peak runoff rates is needed for use with watershed models, and for the development of new techniques of estimating peak flow rates and their frequencies of occurrence from small ... -
Asymmetric Flow into Well by Finite Elements
(American Society of Civil Engineers, 1994)This paper outlines a theoretical development and solution of asymmetric flow into a well. A semianalytical finite‐element method has been used to simulate the asymmetric nature of the probable ground‐water inflow. The ... -
Green‐Ampt Analysis of Wetting Patterns for Surface Emitters
(American Society of Civil Engineers, 1994)A three‐dimensional Green‐Ampt analysis is developed, and the infiltration capacity curve for a three‐dimensional infiltration model is presented. The infiltration‐capacity curve represents the time distribution of ... -
Agroforestry Drainage Management Model. II: Field Water Flow
(American Society of Civil Engineers, 1994)Part I of this paper presented a two‐dimensional dynamic finite‐element model of fluid flow and solute transport in root‐soil profiles with different root‐uptake mechanisms. Field data collected in 1989 were used to validate ... -
Maximum Surface Storage Provided by Crop Residue
(American Society of Civil Engineers, 1994)Small ponds created by crop residue serve to store water on upland areas. The present study is conducted to identify the maximum surface storage provided by crop residue. Equations for estimating surface storage are derived ... -
Agroforestry Drainage Management Model. III: Field Salt Flow
(American Society of Civil Engineers, 1994)Eucalyptus trees are being recommended as a management option for lowering the shallow ground water and reusing saline subsurface drainage water in drainage‐impacted areas of the San Joaquin Valley in California. Both field ... -
Downstream Control Algorithm for Irrigation Canals
(American Society of Civil Engineers, 1994)A downstream control algorithm for on‐demand operation of irrigation canal systems is presented. A constant water level is maintained at the downstream end of the pool. The approach is based on an explicit finite‐difference ... -
Partitioning of Evapotranspiration Using Lysimeter and Micro‐Bowen‐Ratio System
(American Society of Civil Engineers, 1994)The present study estimated evaporation -
Statistical Techniques for Assessing Water‐Quality Effects of BMPs
(American Society of Civil Engineers, 1994)Little has been published on the effectiveness of various management practices in small rural lakes and streams at the watershed scale. In this study, statistical techniques were used to test for changes in water‐quality ... -
Methods and Economics of Drainage Reduction through Improved Irrigation
(American Society of Civil Engineers, 1994)Drainage reduction through improved irrigation is needed for addressing the problem of drainage water disposal in the San Joaquin Valley in California. Options for improving irrigation include improved management of ... -
Recalibration of Parshall Flumes at Low Discharges
(American Society of Civil Engineers, 1994)An inspection of the original study that developed the rating equations for Parshall flumes indicates that the calibration tests were not conducted for discharges as low as is currently recommended for the flumes' use. A ...