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Evaluation of Sand as a Modeling Material Using Vellinga's Guidance
An experimental series of flume tests were conducted using three sizes of sand as modeling sediment in order to evaluate the effect of sediment grain size and the range of validity of...

Mechanics of Embankment Erosion During Overflow
Thousands of dams built in the United States have a potential to be overtopped by flood flows. It is necessary to understand the mechanics of embankment erosion in order to evaluate the...

Vegetal Protection of Embankments and Spillways
Recent advances in the application of tractive stress to the design of grass-lined open channels are used to develop a tentative procedure for analyzing the hydraulic performance of vegetated...

Predicting and Minimizing Embankment Damage Due to Flood Overtopping
Under a contract with the Federal Highway Administration and Bureau of Reclamation, Simons, Li & Associates, Inc. (SLA) is conducting an overtopping damage study to evaluate various...

Mathematical and Laboratory Modeling of Transport in Partially Saturated Soils
The salient features of a two dimensional flow and solute transport model in partially saturated soils are presented. A Galerkin finite element approach for the numerical solution of the...

Controlled-Drainage Supplements Subirrigation in Humid Regions
A computer simulation was conducted using climate and soil conditions of the humid southern U. S. to demonstrate optional operating methods for dual controlled-subdrainage/subirrigation...

Improving Drainage with Laser Controlled Land Grading in the Red River Valley of the North
This paper evaluates a laser controlled land grading project in the Red River Valley of the North. Graded fields are compared with ungraded fields to measure changes in dryland crop yields...

Subsurface Drainage for Erosion Reduction on Croplands of Northwestern Oregon
Subsurface drains installed as a relief system on sloping cropland reduced surface runoff and soil loss from silty soils with underlying slowly permeable layers in northwestern Oregon....

Hydrologic Design Criteria for Dams with Equal Reliability
Appropriateness of design criteria which require using the same Antecedent Moisture Condition (AMC) throughout Kansas for sizing dams and emergency spillways was examined. AMC values which...

Sprinkler Erosion Model
The Soil Conservation Service has developed a model to evaluate the effect of various sprinkler irrigation systems with associated agronomic practices. Many researchers have dealt with...

Bowen Ratio and Penman: Australian-California Tests
Results are presented of evapotranspiration (ET) studies conducted in Davis, California and at two locations in Australia. Good agreements were obtained in early comparisons of Bowen Ratio...

Effective Precipitation in Irrigation Design and Management
Effective precipitation is important in irrigation system design and operation. Numerous methods for estimating effective precipitation have been proposed in the past, including direct...

Field Evaluation of an Advance Rate Feedback Irrigation System
An experimental advance rate feedback system is described for furrow irrigation based upon a simple volume balance model in which surface storage during the irrigation event is neglected....

Reclaiming Wastewater in Phoenix, Arizona
This paper examines the role of wastewater effluent reuse in the future water resource management of the City of Phoenix. The paper seeks to explain why a proposal to renovate effluent...

The Lubbock, Texas, Land Treatment System
The land treatment system at Lubbock, Texas provides an excellent model for studying the response of a system to growth. It also provides insights and justification for current criteria...

Groundwater Recharge Demonstration Projects
In dry climates, natural replenishment rates of aquifers (safe yields) are quite small. Many of these aquifers are being depleted. This is giving rise to an increasing interest in artificial...

Infiltration as a Dependent Variable in Modeling Furrow Irrigation
Most surface irrigation models assume that infiltration is independent of surface flow hydraulics. However, wetted perimeter has been shown to significantly affect infiltration in furrows....

An Overview of Factors Affecting Land Application of Food Processing Wastes
The food processing industry can use slow rate, rapid infiltration or overland flow systems. Slow rate systems are the most common method used for land application. The limiting design...

Winery Wastewater Land Application
Winery wastewater is characterized by low pH, relatively high BOD, and a low nutrient content. Land application using rapid infiltration basins has been practiced successfully at a number...

Management Challenges Affecting Agricultural Reuse of High-Strength Food Processing Wastewaters
Land treatment of high-strength food processing wastewaters is a viable pollution control technology. Due to the high-strength characteristics of these wastewaters, effective site management...

 

 

 

 

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