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Comparative Simulation of Oil Weathering
Oil spills in the aquatic environment, an unfortunately more and more common occurrence, cause contamination effects which negatively impact water quality, health of ecosystems and water...

Comparison of Methods for Sizing Secondary Treatment Filters for Wastewater
The trickling filter process in which a bacterial biomass is allowed to grow attached to a filter medium of rock or plastic is effectively used for removal of organic materials in domestic...

Study of Biological Reactors for Control of Odor, VOC and Toxic Emissions from Wastewater Treatment Plants
An experiment was performed to assess the use of biological reactors to treat off-gases from publicly owned treatment works (POTWs) containing low concentrations of hydrogen sulfide (H₂S)...

Denitrification of Ground Water/Waste Water using the Aquacel System
Within the United States there are vast reserves of ground water which are no longer suitable for drinking because of high concentration (> 10 mg/l NO3-N) nitrates. Furthermore,...

Treatment of Wet Weather Discharges in Columbus, Georgia
The City of Columbus, Georgia and the Columbus Water Works (CWW) instigated a combined sewer overflow (CS 0) control program to protect the Chattahoochee River against adverse impacts...

Rock Riprap for Grade Control
Rock chutes (riprap channels on steep slopes) are used as grade control structures to safely conduct a water flow to a lower elevation. Common procedures used for design of rock riprap...

Drop Structures in the Real World: Guidelines for Drop Structures in Grass Lined and Wetlands Channels

Grade-Control Structures for Salt River Channelization
Soil cement grade-control structures have been designed and constructed in conjunction with channelization projects along the Salt River in Phoenix, Arizona. The structures were designed...

Comparison of Stochastic Programming and Robust Optimization Models for Groundwater Plume Containment
Stochastic optimization models for containing a groundwater contaminant plume through the installation and operation of pumping wells are developed. Two related formulations are presented?stochastic...

The Impact of Numerical Precision on Optimal Groundwater Hydraulic Control
The numerical precision retained in the formulation of groundwater hydraulic control optimization problems can have significant impacts on the accuracy of the solution. Sources of imprecision...

Optimization of Groundwater Remediation with DES
Evolutionary Algorithms (EAs) are non-derivative-based and stochastic op timization methods which simulate the natural evolution process. A type of EA, Derandomized Evolution Strategy...

Drought Experiences of Ohio and Their Applications in the DAR-JAI River Basin of Taiwan
The shortage of water due to droughts could cause tremendous environmental and economical impacts to the affected area such as the unsuitability for aquatic life and the inadequacy for...

The Reclamation Drought Index: Guidelines and Practical Applications
Drought is a familiar occurrence that lacks the drama and immediacy of other natural disasters such as hurricanes, floods, and earthquakes, but the economic repercussions can be equally...

Dynamic vs. Quasi-Static Effluent Limits
Selenium water quality objectives are currently being exceeded in the San Joaquin River, California due to agricultural subsurface drainage discharges. The Federal Clean Water Act requires...

Sources and Circulation of Salt in the San Joaquin River Basin
Historical data and a water quality model were used to quantify the sources of salt, boron and selenium in the lower San Joaquin River (SJR) basin, California. Mean monthly data for sources...

A Regional Management Plan to Improve Water Quality in the Grassland Basin
Seven irrigation and drainage districts on the west side of Californias San Joaquin Valley have formed a regional drainage entity to implement programs that will reduce the load of selenium...

Economic Issues Regarding Water Quality Objectives in the Grassland Basin
A conceptual framework is presented for evaluating the potential costs and benefits of water quality objectives in the Grassland Basin. The investments and expenditures required to achieve...

A Surface Collection Design Approach on the Lower Columbia River
Surface collection and bypass of downstream migrating juvenile salmon has the potential to help improve the survival of the Columbia River salmon population. However, surface passage on...

Surface Bypass-Collector Concepts and Performance
Surfacetype bypass collectors and concepts are described. Biological and engineering requirements to pass juvenile salmonids at Snake?Columbia River dams are presented. The components,...

Flexible Water Deliveries: One District's Experience
The Merced Irrigation District (MID) has implemented two significant incentive programs in 1995 to provide surface irrigation water to farmers who have shifted to private wells for irrigation....

 

 

 

 

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