Practical Approaches Used in Neutron Meter Moisture Monitoring
This paper describes a practical, appropriate methodology for utilizing neutron meter soil moisture measurements to provide irrigation management information to farmers. A neutron meter...
Strategies to Reduce Salt Load in Drainage Water
A study of irrigation efficiency, drainage flow and trace element loading in the drainage water from a 14000 ha irrigation district on the west side of the San Joaquin Valley of California...
Reduction of Deep Percolation and Drain Water
Management of irrigated agriculture for control of toxic trace elements in agricultural drainage waters must include consideration of a variety of factors and their interactions with one...
Geochemical Factors Affecting Trace Element Mobility
Selected geochemical processes to be considered when modeling the movement of trace elements in soils are presented. The topics covered include: solid phase-solubility equilibria, ion...
Hydrogeologic Factors Affecting Trace Element Mobility
Alluvial deposits often comprise the aquifer beneath irrigated lands in the southwestern U.S. The presence of buried stream channels in, and layering of, shallow alluvial deposits are...
Prognosis on Managing Trace Elements
Management options assessed for trace elements discharged from irrigated lands include source control, drainwater reuse, drainwater treatment and removal of contaminants, disposal, and...
Location, Design, and Construction of Water Wells
Proper location, design, and construction of water wells are important to assure their efficient operation and minimize maintenance problems. Detailed and accurate records of the design...
San Miguel Water Supply Study: A Case Study in Non-Structural Alternatives for Improved Irrigation Water Supplies
The San Miguel study area is located in southwestern Colorado sixty miles south of Grand Junction. Investigations of alternatives for developing additional water supplies involved mainstem...
Water Quality of Jubba River in Somalia
Monitoring of water quality in the Jubba River in Somalia of East Africa, led to indications of a potential impact of toxic trace elements, salinity and biocides in restricting agricultural...
Entrenched Channels and Alluvial Fan Flooding
Because the individual flood paths on alluvial fans are unpredictable, determining flood hazards on such landforms is hindered by particular complications. The proper framework in which...
California-Nevada Water Marketing Issues
Many California local agency interests tend to oppose, at least initially, transfers of water across the stateline to Nevada, and have been to some extent successful in creating provisions...
Mudflow Rheology in a Vertically Rotating Flume
Joint research by the U.S. Geological Survey and the University of Missouri-Rolla currently (1990) is being conducted on a 3.05 meters in diameter vertically rotating flume used to simulate...
Two-Dimensional Modeling of Overland Flow
Two-dimensional distributed finite element (F-E) and finite difference (F-D) models are developed to simulate storm events on arid watersheds. The F-E model uses the kinematic wave approximation,...
Graphical Verification of Flood Frequency Analysis
In the analysis of flood frequency data, a proper distribution must be chosen to fit the data being analyzed. A properly applied distribution can minimize errors in the extrapolation of...
Graphics Advances Aid Flood Engineers
In the last decade options have been suggested to the Log-Pearson III (LP3) computation for predicting design flood behavior in semi-arid conditions. Observations from an ongoing study...
Discrete Element Simulation of River Ice Jams
The discrete element method provides an alternative to traditional analytical and experimental methods for studying river ice transport phenomena. In the discrete element method, the movement...
Introduction of Variational Principle Into Open Channel Hydrodynamics
Possible applications of the variational principle maximizing the entropy are illustrated. Open channel flow properties are expressed in terms of 'entropy parameter',...
The Method of Lines Solution of Unsteady Open Channel Flow Equations Along Characteristics
The method of characteristics (MOC) has long been considered as a natural procedure for solving transient flow problems. In this paper, by using the concept of the method of lines, the...
Comparison of Correction Factor for Dispersion Coefficient Based on Entropy and Logarithmic Velocity Profiles
Recently, new velocity distribution equations have been developed by Chiu (1987, 1989) through the use of maximum entropy principle. A comparison will be made of the correction factor...
Numerical Modeling of a Trench Fill and Scour
The sediment fill and scour in a dredged trench was numerically simulated by the nodal-collocation finite element method and an explicit scheme. The one-dimensional unsteady sediment-laden...
Return to search