Distribution of Stable Isotopes in Ground Water in the Rialto-Colton Basin, California
Since 1982, imported water originating in the Sierra Nevada has been used to recharge the Rialto-Colton ground-water basin, about 100 km east of Los Angeles. Stable isotopes of oxygen...
Ground Water Management for Wellhead Protection in a Confined to Semiconfined Aquifer, Salt Lake County, Utah
The 1986 Amendments to the Safe Drinking Water Act (SDWA) established the first nation-wide program to protect ground water resources used for public water supplies. The SDWA seeks to...
Overland Flow Resistance Estimation from Small-Plot Data
The correct application of physical process models, such as the kinetic wave approximation to shallow overland flow, is dependent upon selection of appropriate values for parameters which...
Climate Change: Is Trouble Ahead for Water Engineers?
Very long range forecasts of future global warming from 2 to 5?C have been made as a result of the increase in carbon dioxide and trace gases in the atmosphere due to man's activities....
Development of a Selenium TMDL for the San Joaquin River
The objective of this study is to devise a user-friendly, reliable method to calculate a screening-level 'Total Maximum Daily Load' (TMDL) for the San Joaquin River and similar western...
IRRICAD ? Computerized Irrigation Design
IRRICAD is a software program that helps irrigation designers by using a computerized systems approach to design. The program features drawing CAD input, interpolation of elevation data,...
CPIVOT v 2.0 Center Pivot Analysis and Design Software
A micro-computer based software package is presented which can be used for hydraulic design and/or analysis of center pivot irrigation systems. The software is written in C and requires...
Flow Simulation for Surface Irrigation Design
Experience shows that even the most sophisticated and accurate computer models of the surface-irrigation process will not be widely used by design agencies unless they manifest a certain...
Siting Agricultural Weather Stations
Studies were conducted in Arizona and Washington to investigate how the surrounding fetch affects data collected by agricultural weather stations (AWS). AWS surrounded by extensive areas...
Streamflow Depletions for Water Transfers in Utah
All inter- or intra-state transfers of Utah water rights must be accomplished by application and receive the approval of the Utah State Engineer. This paper summarizes the engineering...
Streamflow Depletions Considered in Water Transfers
In the State of Colorado, streamflow depletions are defined as that amount of water diverted to beneficial use minus return flows to the stream system. This paper summarizes the engineering...
Streamflow Depletions Resulting from Ground Water Transfers
An application to move the point of diversion of a quasi-municipal ground water right from about 4.8 km to a second well about 0.3 km from a river channel was made in the Reno/Sparks,...
Availability Analysis of Irrigation Systems for Improved Management
Availability of an irrigation system is defined as the ratio of time of successful system operation to total desired operation time. Operation is successful when the flow rate of water...
Steel Penstocks
Parameter Estimates for a Groundwater Model
This paper presents a parameter sensitivity study of a two dimensional flow and transport model of a contaminated site. Hydrogeological and site data from previous investigations were...
An Overview of Methods to Delineate Capture Zones of Pumping Wells
Rainfall over the surface area of an unconfined aquifer, which contributes flow to a pumping well under Dupuit conditions, was estimated. Using a two-dimensional analytical model with...
Regulatory Constraints on Vegetation Control in Channels, A Case Study of the Santa Ynez River, Santa Barbara County, California
The Santa Barbara County Flood Control and Water Conservation District has encountered difficulties in obtaining permits from state and federal agencies for vegetation control activities...
A Semi-Discrete Element Approach to the River Ice Breakup and Jamming Process
A semi-discrete element approach was developed to simulate the whole river ice breakup and jamming process. In this approach, ice mass is treated as discrete elements, and the movement...
Mechanism of Air Entrainment in Spillway Aerators
The mechanism of air entrainment in the Nappe over spillway aerators was investigated. Turbulence was identified as the main agent for aeration. It was found that Nappe underpressure influences...
The Influence of Slope and Surface Roughness on Trapezoidal Free Overfall Characteristics
The brink depth-discharge relationship for trapezoidal free overfalls was investigated including the effects of slope and roughness. The theoretical relationship is based on the momentum...
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