Morphology and Roughness in the Hydraulics of Large Bed Element Channels
The evolution of natural steep channels is a function of two factors in accordance with the principle of least action: flow distribution in the channel and terrain geomorphology. Large...
Sediment Production from Forest Roads with Wheel Ruts
Artificial rainfall was applied to two sets of paired plots 30.5 m long by 1.52 m wide, each set on a different soil type. One plot in each set contained a wheel rut while the other did...
Management Strategies for Baseflow Augmentation
Management strategies for baseflow augmentation fall into the following categories: (1) range management, (2) upland vegetation management, (3) riparian vegetation management, (4) upland...
Predicting Overland Flow Response: Effects of Spatially-Varying Soil Properties
A physically-based model of Horton overland flow is applied to experimental data from a simulated rainfall event in eastern Washington. The model employs the Green-Ampt infiltration equation...
Evaluating Spring Flow Trends at Pipe Spring National Monument and Vicinity, Arizona
A study conducted by the National Park Service Water Resources Division is resolving if ground water pumping is causing spring flow declines at Pipe Spring National Monument (PISP). Ground...
Sprinkler System Design for Frost Protection
Both undertree and overtree systems for frost protection by sprinkling are currently being used. The criteria based on experimental results and theoretical modeling have been reviewed...
Infiltration or Roughness from Surface Irrigation Advance
Over the past several decades, a significant effort has gone into the development of mathematical models of water flow over the soil surface. Significant progress has been made in prediction...
A Modern Approach to the Design of Grassed Channels
The design of grassed channels can be based on modern fluid mechanics principles. The resistance to flow in a grassed channel is linked directly to the relative roughness of the flow through...
Simple Water Measuring Device for On Farm Irrigation Evaluation
Laboratory experiments were conducted for the calibration of three flumes of different sizes. The logarithmic transformation in linear regression yielded excellent results for the stage-discharge...
Delivering Appropriate Quantities of Water to the Farm
To study how well an irrigation district was able to meet farmer demand, water deliveries along two monitored lateral canals were compared to the orders and bills for these events. The...
Computation of Unsaturated Soil Parameters Using Upward Infiltration Empirical Data
The relationship between soil moisture content and hydraulic conductivity with the soil tension be defined to simulate unsaturated flow in a porous media. Direct measurements of these...
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...
Deep Percolation, Drainage and Water Quality
The purpose of this study is to illustrate and and qualitatively describe results of steady and transient numerical simulations examining the influence of drain spacing and depth on shallow...
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...
Rehabilitation of Water Wells
The main causes of declining well yield are biological growths, mechanical clogging and chemical encrustation. Because the treatment of the causes of encrustation and clogging is expensive...
Annual Flow Variations in the Nile River System
The annual flow series of the Nile River System at some key gauging stations for the period 1912-1988 are presented and discussed. The relatively stable period, pre-1961, has helped establish...
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...
Potential Sediment Yield From a Burned Drainage - An Example From the Wasatch Front, Utah
Two debris flows hit Mapleton City, Utah, as a result of rainstorms on a steep drainage basin, which had recently been burned. Debris flow potential for the area was evaluated to determine...
Process-Based Debris-Flow Prediction Method
This paper briefly identifies problems with traditional approaches to debris-flow prediction and presents a simplified process-based model (Williams and others, 1988) to accomplish the...
Olancha Debris Flow: An Example of an Isolated Damaging Event
This paper presents the case history of an isolated flood/debris flow that damaged the City of Los Angeles Department of Water and Power Aqueduct and threatened serious damage to U.S....
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