Watershed Management for a Limited Coastal Aquifer System
Developing a watershed strategy, which incorporates key issues of a particular watershed, may entail the coordination of several different agencies. Work performed by the USGS, local public...
Mapping Groundwater Vulnerability to Nitrate and Pesticide Contamination in the Salinas Valley, Monterey County, California
This paper describes the approach and the associated investigation leading to the development of groundwater vulnerability maps for a critical water supply region in the Monterey County....
Drainage Recirculation Project for Water Quality
The State Water Resources Control Board and the federal Environmental Protection Agency have described water quality objectives for selenium in the San Joaquin River. In order to achieve...
Comparison of Water Backwash and Brush Cleaning Systems for Vertical Panel Fish Screens
Vertical plate fish screens have been installed at a number of locations within the Pacific Northwest The vertical orientation of the screen panels requires screen cleaning systems designed...
Optimization of a Ground-Water Injection/Extraction System
This paper describes the application of linear programming to optimize the number, location, and rates of extraction/injection for a pump and treat system at a groundwater remediation...
Removal of Arsenic From Ground Water Using Granular Activated Carbon
Batch adsorption isotherm studies found that activated carbon (Hydrodarco, 14 X 40 mesh, American Norit) had removals of arsenic as high as 94% for a GAC dosage of 100 g/L and an initial...
Salinity and Hydraulic Issues at a Constructed Wetlands
A constructed wetlands at Boulder City, Nevada was designed to use effluent pumped from the City's wastewater treatment plant. The design was complicated by the highly permeable...
South Florida Water Management District: Reconstructing the Everglades Ecosystem
Anthropogenic influences have reduced florida's Everglades over the last 140 years to a struggling remnant of its historic size and ecological potential. The State of Florida's...
Geochemical Modeling of Lead in Vadose Zone
In recent years, researchers have used multicomponent reactive transport models to study the mobility of potentially toxic heavy metals in the subsurface. In this study, such a mathematical...
Health Risk Sensitivity to Variable and Uncertain Parameters
A methodology is presented that attempts to quantify the effects of individual variability and parameter uncertainty in a groundwater-driven health risk assessment. Two modeling approaches...
Regional Groundwater Management with Health Risk Assessment
A regional groundwater system may have several areas which are contaminated with organic chemicals. In general, the objective of groundwater management is to supply the demand for water...
Critical Needs for Sustainable Water Resources: Bridging the Gap Between Science and Implementation
This presentation will summarize the key findings of the workshop, as synthesized and prioritized by a Steering Committee composed of multi-disciplinary experts in water and environmental-related...
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...
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...
Soil Water Chemistry of Irrigation with Drainwater
The use of drainwater for irrigation was demonstrated as a management option that reduces net farm drainage and provides control over water quality (O'Brien and Guitjens,...
BMP for Control of Agricultural Nonpoint Source Flow
Nine ha of spring wheat were sprinkle irrigated with drainwater from 15 subsurface drains. The objective was to demonstrate that use of drainwater for irrigation improves the net efficiency...
Shallow and Surfacing Ground Water in an Arid Urban Environment
Return flow from landscape irrigation is now a major recharge source and the loss of phreatophytic vegetation has caused decreased evapotranspiration discharge in Henderson, Nevada. Lateral...
The Integration of Receiving Water Impacts in the Evaluation Process of Alternative Designs for CSO Abatement in Providence, RI
The Providence, Rhode Island sewer system is undergoing a combined sewer overflow abatement program. One measure of the program's effectiveness is the reduction of water quality...
Selecting Design Conditions as Part of a Watershed Approach to Water Quality Control
EPA water quality guidance recommends that water quality criteria be exceeded no more than once in three years. Standard approaches, based on the use of critical design conditions, have...
Return to search