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Influence of Backwater on Headcut Advance
A study was performed to examine the influence of backwater level downstream of an overfall on headcut advance. The discharge, overfall height, and soil type were held constant while varying...

Application of High-Resolution Schemes to Free Surface Flows in Irregular Channels
A 1-D flow model employing a high resolution scheme based on the Total Variation Diminishing concept is applied to non-prismatic channels of irregular cross-section. The hydraulic properties...

A Graphical Environment for Multi-Dimensional Surface Water Modeling
Recently the Engineering Computer Graphics Laboratory of Brigham Young University in conjunction with the U.S. Army Engineer Waterways Experiment Station and the Federal Highway Administration...

Depth-Averaged Equations for Free Surface Flows
Depth-Averaged equations for free surface flow are derived by applying fundamental physical principles of mass conservation, momentum and moment of momentum on a control volume from the...

Economic Incentives Encourage Improvements In Farm-Level Water Management Practices
The Broadview Water District has implemented economic incentive programs in recent years to encourage improvements in irrigation practices to reduce the volume of subsurface drain water...

Secondary Containment Design Practices
Over the past several decades the design approach to containment of spills has not been consistent resulting in release of hazardous substances into the environment. The increased discovery...

Comparative Simulation of Oil Weathering
Oil spills in the aquatic environment, an unfortunately more and more common occurrence, cause contamination effects which negatively impact water quality, health of ecosystems and water...

Flexible Water Deliveries: One District's Experience
The Merced Irrigation District (MID) has implemented two significant incentive programs in 1995 to provide surface irrigation water to farmers who have shifted to private wells for irrigation....

Impact of Agricultural Water Conservation on Water Quality in Arid Irrigated Areas
Water quality constituents of concern in irrigation return flow include sediment, nitrate, pesticides, and trace elements. Each of these components can be affected by irrigation and drain...

Coastal Engineering Laboratory and Field Measurements: Some Uncertainties in Measurement
In this paper two examples of uncertainties which can occur in field measurements and measurements in coastal engineering models are examined. These examples are chosen to demonstrate...

Periodic Variation in Karst Stream Losses
A cave taking water from an ephemeral stream periodically reroutes surface and subsurface drainage because of a plug that forms 10 m below the main entrance to the cave. The plug of sand,...

Infiltration Properties at Two Sites in the Konza Prairie
The spatial variability of soil hydraulic properties that govern infiltration were investigated at a pristine site and an agricultural site in the Konza Prairie Research Area of east-central...

The Environmental Valuation Reference Inventory (EVRI) for Water Related Benefits Transfers
Managing our water resources requires knowledge not only of flows, water chemistry and aquatic life, but also of the various uses and economic values that humans place upon the water....

Accidental Situations: Application of Surface-Water Monitoring Data
Under severe manmade environmental changes, nature-protective activities serve to effectively solve a triune task: conservation and recovery of environmental ecosystems, safety of man...

Picacho Reservoir Enhancement Study for Water Recharge, Reparian Enhancement, and Water-Based Recreation Purposes
This study was conducted for the Pinal County Department of Civil Works in Florence, Arizona. It investigated the feasibility of a major enhancement and expansion of Picacho Reservoir,...

The Effect of Climatic Change on Hydrologic Variables
There has been increasing concern about the threat of global warming affecting the earth's climate. This warming scenario, called the greenhouse effect, is believed to be...

Hydraulic Effects of Habitat Structures in Flood Control Channels
Three field sites have been established and laboratory flume experiments begun to assess the effect of habitat enhancement measures on water-surface profiles and local scour in flood control...

Using HEC-RAS to Compute Scour at Bridges
HEC-RAS (River Analysis System) is an integrated system of software, designed for interactive use in a multi-tasking environment. The system is comprised of a graphical user interface...

New Block Copolymers for Membrane Materials
New fluorine containing polymer materials, which contain n-fluoro octylacrylate (pFOA) or n-fluorooctylmethylacrylate (pFOMA) repeating units, are being explored for use in thin film composite...

Identifying Potential Trophic Relationships and Bioaccumulation Pathways between Fish and Invertebrates
A large ocean monitoring database was used to quantify relationships between demersal fish, epibenthic macroinvertebrates (EMI) and benthic infauna that provide potential pathways for...

 

 

 

 

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