Journal of Irrigation and Drainage Engineering: Recent submissions
Now showing items 3401-3420 of 3826
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Why Sediments Deposit in Lined Channels
(American Society of Civil Engineers, 1990)With a view to alleviate waterlogging, minimize maintenance costs, improve conveyance efficiency, etc., numerous unlined channels in India are replaced by parallel‐running, cup‐shaped (round‐bottom), brick‐lined (rigid ... -
Hydrologic Parameter Effects on Small‐Dam Risk Analysis in Missouri
(American Society of Civil Engineers, 1990)The sensitivity of risk cost to hydrologic parameters is evaluated to determine the feasibility of risk analysis as an alternative to existing requirements for rehabilitation at small dams in Missouri. The sensitivity to ... -
Improved Inverted V‐Notch or Chimney Weir
(American Society of Civil Engineers, 1990)This paper is devoted to the improvement of the measuring range of inverted V‐notch (IVN) weir, a practical linear sharp‐crested weir, designed earlier by the writers. The range of linearity of IVN can be considerably ... -
Drawdowns for Constant‐Discharge One‐Dimensional Leaky Aquifer
(American Society of Civil Engineers, 1990)A new mathematical solution was developed for the constant-discharge boundary condition for one-dimensional horizontal flow under nonsteady conditions in a semi-infinite leaky aquifer. The solution can be used to calculate ... -
Erratum: “Sorption and Transport of Pesticides in Ground Water: Critical Review” by David A. Sabatini and T. Al Austin (January/February, 1990, Vol. 116, No. 1)
(American Society of Civil Engineers, 1990) -
Predicting Daily Evapotranspiration (ETd) from Short‐Term Values
(American Society of Civil Engineers, 1990)Application of a remote sensing technique for estimating regional evapotranspiration requires extrapolation of instantaneous values to periods on the order of 1 day or more to be of practical use. A method for developing ... -
Deficit Irrigation. II: Observations in Columbia Basin
(American Society of Civil Engineers, 1990)A companion paper demonstrates that deficit irrigation can be profitable when irrigation costs are high or water supplies are limited. The present paper provides specific examples of deficit irrigation practices in the ... -
Conjunctive Use—Advantages, Constraints, and Examples
(American Society of Civil Engineers, 1990)Conjunctive use of surface water and ground water can usually increase yields at lower costs than more dams and reservoirs operated separately. There are three main types of conjunctive use projects: (1) Stream diversions; ... -
Development of Low‐Discharge Baffle‐Sluice Modules
(American Society of Civil Engineers, 1990)Low‐discharge, portable irrigation modules can contribute to the modernization of water management systems. Various types of irrigation modules have been developed for specific uses but are not suitable for use at the farm ... -
Deficit Irrigation. I: Analytical Framework
(American Society of Civil Engineers, 1990)The economics of deficit irrigation are examined. The concepts developed in the heuristic discussion are developed into a set of rigorous mathematical expressions for determination of optimum water use under deficit ... -
Drip Irrigation Nonlinear Optimization Model
(American Society of Civil Engineers, 1990)This paper develops a nonlinear optimization model for the design and management of drip irrigation systems. Decision variables are: pipe diameter, pipe length, number of emitters in each lateral, number of laterals in a ... -
Remote‐Sensing Application to Well Monitoring
(American Society of Civil Engineers, 1990)The artesian wells flowing uncontrolled in many parts of Florida have caused a serious saline‐contamination problem. Locating these wells by ground search is made difficult by the urbanized or reforested condition of ... -
Satellite Data and Geographic Information System for Rainfall Estimation
(American Society of Civil Engineers, 1990)Rainfall data constitute an important parameter for studying water resources‐related problems. Currently, little is known about the accuracy of the estimation of rainfall in a given area, primarily because of the wide ... -
Real‐Time Estimation of Furrow Infiltration
(American Society of Civil Engineers, 1990)An analysis to determine infiltration parameters from the early stages of furrow advance is reported. The analysis uses a kinematic‐wave simulation model in conjunction with a simplex search procedure to minimize the ... -
Applying Partial Irrigation in Pakistan
(American Society of Civil Engineers, 1990)Partial irrigation is supplying less water than a crop needs for full production. Partially irrigating crops is intended to stretch water supplies and increase total crop production and profit. Pakistan is short of water ... -
Deep Seepage Under Nonuniform Sprinkler Irrigation: I. Theory
(American Society of Civil Engineers, 1990)This study analyzes factors affecting deep percolation. Harmonic analysis is used to derive the effect of nonuniform irrigation on deep percolation. The Christiansen uniformity coefficient (CUC) is described by a sinusoidal ... -
Effects of Drought on Streamflow Characteristics
(American Society of Civil Engineers, 1990)Droughts are defined using daily streamflow series and different truncation levels including 30%, 50%, 60%, 70%, 80%, and 90% of recorded daily flows. Flow ratios, which are obtained by dividing subbasin flows of different ... -
Deep Seepage Under Nonuniform Sprinkler Irrigation. II: Field Data
(American Society of Civil Engineers, 1990)This study evaluates quantitatively the various components of an irrigation regime affecting deep percolation. The relationship between applied water and a point water balance is studied using a linear move sprinkler, ... -
Simple and Accurate Friction Loss Equation for Plastic Pipe
(American Society of Civil Engineers, 1990)The Blasius equation which has been verified by many researchers and has been recently shown to work very well for small diameter plastic pipe can be combined with the Darcy-Weisbach equation to give a simple and accurate ... -
Irrigation Planning by Multilevel Optimization
(American Society of Civil Engineers, 1990)The complex problem of irrigation management in a large heterogeneous basin is solved by using a multilevel optimization technique. The real problem consists of determining the optimal cropping patterns in various subareas ...