Simulation of Regional Ground-Water Flow on a Transboundary Flowline; Trans-Pecos, Texas and Chihuahua, Mexico
A two-dimensional, steady-state, cross-sectional model was used to evaluate boundary conditions, residence times, and potential transboundary movement along a 28 mi (45 km) flowline between...
A Cost-Effective approach to
A bioventing and groundwater treatment system designed to enhance the natural biodegradation of diesel fuel residuals in soil and prevent further groundwater degradation was installed...
Water Resources Investigation Along Salt River in Phoenix and Tempe Area
The Salt River originates in the White Mountains of eastern Arizona and drains westward through the Phoenix metropolitan area to its confluence with the Gila River approximately 15 miles...
Physical Distribution System Models for Assessing the Impact of Water Quality on Regrowth and Corrosion
Over the past several years, there have been several new and proposed Safe Drinking Water Act (SDWA) regulations that will require many water utilities to modif treatment operations to...
Climate Change: What the North American Water Engineer Should Know
Long-range forecasts of future global warming have been made based on the increase in carbon dioxide and trace gases in the air from human activities. Potential changes which would especially...
Simulation of Interaction between Canal Regulation and Groundwater
l-D canal routing module has been developed to perform the operation of controlled structures for regulating flow in the canal network system and incorporated in the Three-Dimensional...
Innovative Effluent Management for Sustainability
The City of San Jose, California (USA) has developed an original, integrated approach to managing wastewater treatment plant effluent and preserving the receiving water ecosystem. Highlights...
Simulation of Perilithic Algae as a Biofilm and Its Interaction with the Water Column
A one-dimensional bioflim model has been constructed consisting of a particulate phase of algae and inert material and diffusive transport of nutrients and oxygen. Also included is mass...
Application of Regime Theory in Practice: A Case Study
Alluvial channels are known to adjust their slope, width, depth and velocity to achieve stable conditions given a supply of water and sediment. Scientific investigations of stable channels...
Use of Artificial Neural Networks for Agricultural Chemical Assessment of Rural Private Wells
The detection of agricultural chemicals in rural private wells has prompted for numerous studies at regional, state, and national levels. A principal concern arises from the fact that...
A Screening Level Model for Estimation of Vadose Zone Leaching and Saturated Zone Mixing: VLEACHSM
A screening level computer model has been developed for the evaluation of pollutant migration through the vadose zone and subsequent mixing within the saturated zone. The model, called...
Simulation of Unsaturated Zone Virus Transport Adjacent to Municipal Wells
The EPA proposed groundwater disinfection rule for municipal wells would allow exemptions if, among other options, the necessary virus source setback distance could be maintained to provide...
Characterization of Canal Operations under Ideal Anticipatory Control
A dimensionless formulation of a gate.stroking model is being used to study general characteristics of control measures that need to be applied upstream in single.pool canal systems to...
California's Visions of Groundwater: A Water Source and a Salt Sink
Public interest in groundwater resources can be expected to increase. There are few alternative, undeveloped, surface water resources to meet increasing water demand for municipalities....
Long-term Consequences of Recycling Drainage Water for Irrigation
Several long.term field studies (i.e. 6 yrs or more) conducted by the USDA/ARS and the University of California have demonstrated that saline drainage water (ECw...
Predicting Transport of Organics through Soil Columns using Distributed Mass-Transfer Rates
A numerical model to describe contaminant transport through soil columns, including distributed mass-transfer, is developed. Both a gamma distribution and a lognormal distribution are...
Management of Contaminated Groundwater Using Natural Attenuation
Many state and federal regulations governing remediation of contaminated groundwater give preference to the implementation of remedial alternatives which are capable of providing protection...
Sediment Impacts on Yield from a Two-Reservoir System in Puerto Rico
The Dos Bocas and Caonillas reservoirs in Puerto Rico are being considered for conversion from hydroelectric to water supply operation. Both reservoirs are approximately 50 years old and...
US/Mexico Border Drinking Water Study
This report is an outgrowth of a more detailed report, written as part of an Environmental Protection Agency (EPA) study. This report represents my views, and does not necessarily represent...
Shallow Ground Water Management with a Modified Subsurface Drainage System
An existing subsurface drainage system was modified to control the flow from the drain laterals and to control the water table depth on a portion of the field. Tomatoes and cotton have...
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