VTechWorks Repository :: Browsing by Author "Cox, William E."

Browsing by Author "Cox, William E."

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The 1986 amendments to the Safe Drinking Water Act : impacts on Virginia's water supply industry
Cox, William E.; Sherrard, Joseph H.; Gaw, Christopher D. (Virginia Water Resources Research Center, Virginia Polytechnic Institute and State University, 1991-10)
Assessing Drought Flows For Yield Estimation
Gillespie, Jason Carter (Virginia Tech, 2002-12-12)
Determining safe yield of an existing water supply is a basic aspect of water supply planning. Where water is withdrawn from a river directly without any storage, the withdrawal is constrained by the worst drought flow in the river. There is no flexibility for operational adjustments other than implementing conservation measures. Where there is a storage reservoir, yields higher than the flow in the source stream can be maintained for a period of time by releasing the water in storage. The determination of safe yield in this situation requires elaborate computation. This thesis presents a synthesis of methods of drought flow analysis and yield estimation. The yield depends on both the magnitude of the deficit and its temporal distribution. A new Markov chain analysis for assessing frequencies of annual flows is proposed. The Markov chain results compare very well with the empirical data analysis. Another advantage of the Markov chain analysis is that both high and low flows are considered simultaneously; no separate analyses for the lower and upper tails of the distribution are necessary. The temporal distribution of drought flows is considered with the aid of the generalized bootstrap method, time series analysis, and cluster sequencing of worsening droughts called Waitt's procedure. The methods are applied to drought inflows for three different water supply reservoirs in Spotsylvania County, Virginia, and different yield estimates are obtained.
Computational Tools for Improved Analysis and Assessment of Groundwater Remediation Sites
Joseph, Joshua Allen Jr. (Virginia Tech, 2008-04-24)
Remediation of contaminated groundwater remains a high-priority national goal in the United States. Water is essential to life, and new sources of water are needed for an expanding population. Groundwater remediation remains a significant technical challenge despite decades of research into this field. New approaches are needed to address the most severely-polluted aquifers, and cost-effective solutions are required to meet remediation objectives that protect human health and the environment. Source reduction combined with Monitored Natural Attenuation (MNA) is a remediation strategy whereby the source of contamination is aggressively treated or removed and the residual groundwater plume depletes due to natural processes in the subsurface. The USEPA requires long-term performance monitoring of groundwater at MNA sites over the remediation timeframe, which often takes decades to complete. Presently, computational tools are lacking to adequately integrate source remediation with economic models. Furthermore, no framework has been developed to highlight the tradeoff between the degree of remediation versus the level of benefit within a cost structure. Using the Natural Attenuation Software (NAS) package developed at Virginia Tech, a set of formulae have been developed for calculating the TOR for petroleum-contaminated aquifers (specifically tracking benzene and MTBE) through statistical techniques. With the knowledge of source area residual saturation, groundwater velocity, and contaminant plume source length, the time to remediate a site contaminated with either benzene or MTBE can be determined across a range of regulatory maximum contaminant levels. After developing formulae for TOR, an integrated and interactive decision tool for framing the decision analysis component of the remediation problem was developed. While MNA can be a stand-alone groundwater remediation technology, significant benefits may be realized by layering a more traditional source zone remedial technique with MNA. Excavation and soil vapor extraction when applied to the front end of a remedial action plan can decrease the amount of time to remediation and while generally more expensive than an MNA-only approach, may accrue long-term economic advantages that would otherwise be foregone. The value of these research components can be realized within the engineering and science communities, as well as through government, business and industry, and communities where groundwater contamination and remediation are of issue. Together, these tools constitute the Sâ ªEâ ªEâ ªPâ ªAGE paradigm, founded upon the concept of sound science for an environmental engineering, effectual economics, and public policy agenda. The TOR formulation simplifies the inputs necessary to determine the number of years that an MNA strategy will require before project closure and thus reduces the specialized skills and training required to perform a numerical analysis that for one set of conditions could require many hours of simulation time. The economic decision tool, that utilizes a life cycle model to evaluate a set of feasible alternatives, highlights the tradeoffs between time and economics can be realized over the lifetime of the remedial project.
Control of nonpoint source pollution in Virginia : an assessment of the local role
Cox, William E.; Herson-Jones, Lorraine M. (Virginia Water Resources Research Center, Virginia Polytechnic Institute and State University, 1987-11)
Curbside collection of recyclable materials: fifteen cases studies in the United States
Waterman, Donna Ruth (Virginia Tech, 1988-03-01)
Fifteen curbside recycling programs in the United States, from communities representing a variety of economic, geographic and political situations, were reviewed in this study. Case studies were analyzed and discussed with respect to four areas of interest to program planners: administration, operations, promotion and evaluation. No objective rating of the programs was attempted, but approaches were reviewed with respect to their ability to satisfy the goals of the programs. Comparisons of participation rates, waste diversion rates, and costs were used cautiously because of the inconsistencies in how the data were developed from program to program. Administrative approaches found in the case studies included: (a) complete ownership of the collection and processing system by municipalities; (b) contracted service by private waste management firms; (c) contracted or subsidized service by non-profit organizations; and (d) combinations of municipal, private, and non-profit services. Operational systems were examined with respect to the effectiveness of the service in stimulating participation, given the practical, political, and budgetary constraints. Variables of operation are closely related and include: (a) which materials are collected; (b) the degree of materials separation required; (c) the type of collection vehicle(s) used; (d) collection frequency and coincidence with garbage collection; (e) the provision of in home containers; and (t) the extent of post-collection materials processing. Four categories of promotional techniques used in curbside recycling programs were discussed: (a) publicity and education; (b) personal contact; (c) economic incentives; and (d) ordinances mandating source-separation. The impacts of these techniques on participation in the case study programs were discussed. Techniques for evaluating the efficacy of curbside recycling programs were also discussed. Participation rates, waste diversion rates, and cost were reviewed with respect to current usage and recommendations were made for increasing their usefulness as indicators of the success of programs or program elements.
Deep Well Injection of Liquid Residuals: Proceedings of a Conference/Workshop on Policy, Technical, and legal Considerations
(Virginia Water Resources Research Center, 1975-05)
Development and application of techniques for evaluating the success of local groundwater protection programs
Facciolo, Mary T. (Virginia Tech, 1994-09-06)
The existence of comprehensive groundwater protection programs on the federal, state, and local levels was investigated. Because of the unique characteristics of aquifers and contamination sources, local groundwater protection programs were found to be the most comprehensive; however, it was discovered that no universally accepted method existed to measure their effectiveness. An evaluation method was developed to determine local groundwater protection program effectiveness, and the method was applied in two case studies, one urban and one rural. The urban program, developed in Dayton, Ohio, was found to be a comprehensive and effectively implemented program; the rural program, developed in Clarke County, Virginia, was found to be a comprehensive program, but lacked full implementation. The experience gained in the case studies was used to revise the format of the evaluation method, and draw conclusions concerning the usefulness of the method. A description of the evaluation method, the case studies, and all related data collection are included.
Development of procedures for improved resolution of conflicts related to interjurisdictional water transfer
Cox, William E.; Shabman, Leonard A. (Virginia Water Resources Research Center, Virginia Polytechnic Institute and State University, 1985-09)
An economic analysis of low-input agriculture as a groundwater protection strategy
Diebel, Penelope L. (Virginia Tech, 1990-10-15)
The unique characteristics of agricultural contamination of groundwater requires an innovative solution, such as the voluntary use of low-input agriculture (LIA) practices. This study was conducted to identify potential barriers to LIA adoption, analyze the effectiveness of agriculture and natural resource policies designed to remove the barriers to LIA adoption, and to determine the effectiveness of LIA practices in reducing the amount of chemicals released into the environment. A survey of Richmond County, Virginia farming operations and attitudes identified current practices, potential LIA practices for the Northern Neck region of Virginia, and perceived barriers to LIA adoption. A 15 year nonlinear mathematical programming model was used to determine optimal farming practices, among 34 low-input and conventional practices, under various agronomic and policy scenarios. Two non-point simulation models, CREAMS and GLEAMS, were used to estimate the nitrogen and chemical loadings of runoff, groundwater, and sediment; and the soil erosion from each of these scenarios. The model shows that yields, labor requirements, and variable costs, individually have a weak influence on the adoption of low-chemical and organic production activities. The price of the organic nitrogen source, poultry litter, was strongly related to the use of LIA practices. The most cost effective policy for reducing Aatrex (atrazine) contributions to groundwater was a one-third reduction in surface application of Aatrex. However, there were many tradeoffs between chemical, nitrogen, and soil contributions to runoff, percolation, and sediment. The only policies which reduced all of these factors were land retirement policies. The tax level required to promote the use of a LIA practice was too high to be politically feasible, and the use of green-manure crops would require a 100 percent annual subsidy of those crops. A proposed base flexibility program caused more intensive use of conventional chemicals because of the limited number of eligible crops. Low-input agriculture has promised reductions in chemical contamination of groundwater and runoff. This study’s results showed that although that is indeed the case, there are tradeoffs between reduced chemical contamination and nitrogen and soil losses which should be considered when examining the cost effectiveness of using LIA practices as a groundwater protection strategy.
An economic approach to water supply planning in southeastern Virginia
Anderson, William Bagwell (Virginia Tech, 1978-03-06)
An examination was conducted of alternative responses to the water supply situation in four cities in southeastern Virginia. Cost/benefit analyses were performed for the provision of projected levels of use and for reductions in those levels of use achieved with the use of quotas, price increases, and water saving devices. An important element of these analyses was the consideration of the costs incurred as a result of waste water treatment with different levels of water use. The levels of the principal types of water use were estimated for each city. This provided a basis for the projection of water demand curves necessary for estimating the value of water. Optimal schedules for the development of additional water sources were derived through the examination of water demand, relative to the costs of operating and expanding water supply and waste water. treatment facilities.
The economic impacts of the 1986 Safe Drinking Water Act amendments
Gaw, Christopher D. (Virginia Tech, 1991-12-05)
During the early 1980s, concern over the poor quality of the nation's drinking water began to arise. Though the Safe Drinking Water Act (SDWA) had been passed almost a decade earlier, many problems still existed. These problems included the inability of the Environmental Protection Agency to promulgate new drinking water standards and to enforce new and existing standards. To address the shortcomings of the original act, Congress passed the 1986 SDWA Amendments. This document attempts to accomplish two main goals. The first is to summarize selectively the requirements of the 1986 Safe Drinking Water Act (SDWA) Amendments as reflected in proposed and finalized drinking water regulations. The areas of coverage include proposed regulations for eight inorganic and thirty synthetic organic chemical contaminants, the Surface Water Treatment Rule (SWTR), and the Total Coliform Rule (TCR). In order to facilitate an understanding of the SDWA and the 1986 Amendments, a sectional analysis was provided in an appendix. The second goal of this document is to assess the economic impact of this legislation upon Virginia water facilities. In this regard, the cost of water treatment technologies whose use will likely increase as a result of the legislation have been estimated, compiled, and documented. These technologies include granular activated carbon (GAC); reverse osmosis; ion exchange; and various aeration, filtration, and disinfection technologies. Several case studies that assess and highlight the direct impacts of the 1986 SDWA Amendments upon Virginia water facilities are presented.
Effectiveness of BMPs for stormwater management in urbanized watersheds
Kuo, Chin Y.; Loganathan, G. V.; Cox, William E.; Shrestha, Surendra Prakash, 1957-; Ying, Ker-Jen (Virginia Water Resources Research Center, Virginia Polytechnic Institute and State University, 1988-12)
Environmental impact assessment under NEPA: a redundant mechanism?
Balasubrahmanyam, Sunil K. (Virginia Tech, 1993-11-15)
The National Environmental Policy Act (NEPA) declared the Federal government's commitment to comprehensive environmental protection. The cutting-edge of NEPA is its requirement for including an Environmental Impact Statement (EIS) for all major Federal actions significantly affecting the environment. Opinions about the effectiveness of NEPA's EIS requirement range along a continuum. On one extreme are those who view the NEPA process as essentially procedural and overshadowed by other environmental legislation which provide explicit standards of environmental protection for specific environmental values. On the other extreme are those who believe that NEPA provides substantive, comprehensive, and holistic environmental protection of all environmental values. Most of the research on NEPA and its EIS reqUirement has revolved around the act's procedural and substantive mandates. However, despite the proliferation of non-NEPA environmental legislation mandating the protection of such environmental values as air and water quality, land use, and wildlife and endangered species, very little attention has been paid to the role of the mandates and requirements of these legislation in the EIS process. This research effort characterizes the role of NEPA's EIS process in light of the mandates and requirements of this body of non-NEPA legislation to determine the extent to which it addresses the substance of environmental impact evaluation. Specifically, this research focuses on the following questions: • Is the body of non-NEPA legislation sufficiently comprehensive to cover the entire spectrum of environmental values making NEPA's EIS requirement redundant? • Does NEPA enhance the avenues for public participation in government decision-making provided by non-NEPA legislation? • Does NEPA address the impacts of large scale projects, public programs and policy decisions, and cumulative impacts in a more comprehensive manner than non-NEPA legislation? • Does NEPA enhance coordination and integration among Federal agencies in ensuring that environmental issues are addressed comprehensively? The study focuses on the civil works program of the U.S. Army Corps of Engineers (Corps). As such, all conclusions are applicable only to the Corps and are not generalized to other agencies to which NEPA's requirements apply. The study involved a literature review on the role of NEPA in Federal agency planning and decision-making and the development of five research hypotheses with respect to the questions outlined earlier. These hypotheses were then evaluated through a critical review of NEPA and of the role of NEPA and other legislation in Corps activities, and a case-study of a Corps-directed EIS of the Metropolitan Denver Water Supply System. This research effort concluded that there is a relative lack of redundence among the environmental policy and requirement provisions of NEPA and those of non-NEPA legislation—what exists is a complementary, albeit tenuous relationship. Complementary, because in theory and intent: • NEPA proclaims a national policy for all environmental values while specific legislation focus only on specific environmental values; • NEPA does not contain specific standards or requirements but draws from those contained in other legislation; • in the absence of NEPA, assessments of a project's impacts to specific environmental values would be disjointed and incomplete; • the antagonistic and synergistic impacts to various values preclude individualized assessments—such impacts may not be fully addressed in the absence of NEPA; and • NEPA's public participation mechanisms as well as its requirements to ensure coordination among agencies are necessary and complementary to the focused provisions of other legislation. Tenuous, because this complementary intent has not been fully realized in practice. While the intent of NEPA was to ensure the complete and comprehensive alignment of NEPA and non-NEPA legislation, the realities of NEPA’s implementation have brought to light a variety of obstacles. These include: • inadequate guidance on NEPA compliance with other legislation; • inadequate integration among agency planning procedures and procedures for compliance with the requirements of various legislation, and inadequate inter-agency integration mechanisms; • redundant pubic participation procedures; and • a general lack of internalization in Federal agencies of the true intent of NEPA’s national policy declaration. Recommendations to surmount these obstacles include among others: developing comprehensive guidance on NEPA compliance with other legislation; ensuring that agencies’ compliance procedures are standardized and consistent with one another; developing processes whereby NEPA's public participation procedures subsume those of other legislation; and creating a fully represented Federal task force to develop and recommend detailed options for streamlining NEPA implementation.
Estimating Changes in Residential Water Demand for Voluntary and Mandatory Water-Use Restrictions Implemented during the 2002 Virginia Drought
Halich, Gregory Stewart (Virginia Tech, 2005-06-27)
Municipal water suppliers are increasingly faced with implementing programs to address temporary water shortages in the United States. Having reliable estimates for the effectiveness of these programs will help in water supply planning. This dissertation estimates the reductions in residential water-use for voluntary and mandatory water-use restrictions used in Virginia during the 2002 drought. These restrictions were evaluated using both a conventional approach (single-dummy variable for each) and non-conventional approach where program intensity was accounted for. Program intensity was measured by information dissemination for voluntary restrictions, and by information dissemination and enforcement efforts for mandatory restrictions. An unbalanced panel with data from 21 municipal water suppliers was used in the analysis. Under the conventional approach, voluntary restrictions had no significant effect on water-use and mandatory restrictions showed a small to moderate effect. However, program intensity was found to have a significant influence on the magnitude of the water-use reductions in the non-conventional approach. These reductions ranged from 0-7% for voluntary restrictions, and from 0-22% for mandatory restrictions. Moreover, these reductions followed a pattern of increasing program effectiveness with higher levels of information and enforcement. This result indicates that water supply planners need to give considerable attention to the manner in which drought management programs are implemented. Price was also found to have an important effect on residential water-use. A moderate price increase of $3 per 1000 gallons would be expected to reduce water-use by almost 15%. Thus combining mandatory restrictions (implemented at high intensity) with a moderate to high price increase could result in water-use savings approaching 40% based on estimates from this analysis. Other important findings included: a) consumers were responding to a mix of pure marginal price and fixed fees/previous block rates, b) apartment accounts were found to be included in most of the localities residential data and had a significant impact on water-use, and c) the income parameter was measuring more than a pure income effect.
An evaluation of the relative importance of technical and non- technical factors which affect water and sanitation projects in developing countries
Billings, Richard (Virginia Tech, 1989-07-15)
Technical factors, such as engineering and medical approaches, and non-technical factors, such as education and community participation, were evaluated with regard to how they affect water and sanitation programs. Benefits and limitations of each factor were assessed to determine which limitations significantly impact the effectiveness of programs. With this appreciation of technical and nontechnical factors, case studies of control methods of different diseases were evaluated. This led to recommendations of appropriate mixes of technical and non-technical services for disease control. This evaluation was utilized to develop a planning approach to effectively integrate interagency efforts for the control of multiple diseases.
Evolution of water supply mechanisms to reflect changing values: a case study of the Massachusetts water management program
Currey, Gregory Wayne (Virginia Tech, 1991-05-05)
Industrialization and urbanization have brought about localized demand and regional competition for water resources in parts of the eastern United States. Thus, some states have faced critical decisions concerning how to best manage their available water supplies. As fundamental public values have changed over time, public opinion concerning the way in which water supplies should be managed has changed as well, especially in recent years. Consequently, many eastern states have restructured the institutional mechanisms governing water supply management to reflect those changing values and opinions. Massachusetts is a prime example of a state where changes in publicly held values have caused a thorough restructuring of the institutional mechanisms governing water supply management. A case study examines developments that led to the current institutional mechanisms in Massachusetts. Special attention is given to the issues and values that shaped the State’s water supply policy, legislation, and regulatory programs.
Expanded alternatives for water supply in southeastern Virginia
Anderson, William Bagwell; Cox, William E.; Shabman, Leonard A. (Virginia Water Resources Research Center, Virginia Polytechnic Institute and State University, 1978)
The drought of summer 1977 emphasized the potential impact of water supply problems facing southeastern Virginia in the future. However, long before last summer, numerous local, state, and federal planning activities were underway to assess future water demands and to propose alternative solutions to meeting those demands. As a contribution to this planning and decision making process, a study was undertaken at Virginia Tech to assess the institutional impediments to implementation of the various proposed solutions and to document the costs of alternative solutions. Detailed findings will be available before mid-1978. This abbreviated preliminary report suggests that two limited-capacity water sources are potentially feasible interim water supply alternatives and should be considered in the planning process along with other alternatives for the region.
Federal, state, and local government interactions in the administration of wetland protection measures in Virginia
Cunningham, Laura Lynn (Virginia Tech, 1988-02-05)
The objective of this thesis is to determine the effectiveness of Federal, state and local government interactions in administration of tidal wetland protection measures in Virginia. Federal protection for wetlands is authorized by the Clean Water Act [33 U.S.C.A. 1251 et seq. (1986), as amended (Supp. 1987)] and the Rivers and Harbors Act [33 U.S.C.A. 401 et seq. (1986), as amended (Supp. 1987)]. State and local authority is provided by the Virginia Wetlands Act [Va.Code Ann., sec. 62.1-13.1 et seq. (1987)]. Because of overlapping jurisdictions of the statutes, Federal, state, and local governments must interact while implementing wetland protection programs. Effective interactions between the various levels of government are important for the preservation and protection of tidal wetlands. If the three levels of government are able to efficiently administer a program that provides adequate protection of wetlands, similar programs may be applied in other areas such as non-point source pollution control. A history of the development of the wetlands protection program is presented along with a description of applicable statutes, regulations, and permitting requirements. Included is an analysis of the implementation of the wetland statutes by case studies of program operations, a comparison of decisions on applications made by the three different government agencies, and identification of impacts and future trends of the wetland protection programs.
Forces in the initiation and implementation of the rural groundwater protection process
Bankson, Rodney A. (Virginia Tech, 1992-05-28)
Groundwater contamination is a growing problem that is receiving increasing attention on the national scene. There is recognition that federal, state, and local, programs for the protection of the nation's groundwater lack coordinated, integrated policy. Consequently, much of the responsibility for groundwater protection in rural areas falls upon local elected officials and public administrators who may be ill equipped to deal with technically c01nplex issues that are becoming increasingly germane and costly for many communities. This dissertation examines a rural county in Virginia (Clarke County) noted for its progressive groundwater protection policies, with the intent of the examination to improve the knowledge base of the dynamics of the groundwater protection process in rural areas. Case study methodology, implementation theory, and ethnographic techniques are used to determine what factors and forces play the greatest role in initiating and influencing groundwater protection outcomes in a rural setting. Answers are suggested for questions such as: (1) why does Clarke County display a different attitude towards groundwater protection than many of its neighbors in the Shenandoah Valley of Virginia; (2) how was Clarke County able to initiate and institute groundwater protection plans; and (3) is there a special role for the public administrator in the rural groundwater protection policy process?
Ground water management in Virginia: a comparative evaluation of the institutional framework
Cox, William E. (Virginia Tech, 1976-03-05)
The general purpose of this study is the examination of the institutional framework for ground water management, with specific consideration given to Virginia as a case study. The following objectives are encompassed within the general goal of institutional evaluation: (1) identification of the physical determinants of institutional structure, (2) description of current management institutions in Virginia, (3) comparative evaluation of the Virginia institutional framework, and (4) development of institutional guidelines of general applicability and specific recommendations for Virginia. The principal physical characteristic of ground water that determines institutional requirements for management is the dependence of the resource on a broad range of natural processes and the resulting propensity toward a variety of externalities. These external effects exist among individual water uses and also involve a variety of land use practices, indicating the need for a management framework with the capability for integration of a broad scope of considerations. The oldest institutional framework for ground water decision-making consists of private rights that define the limits of individual action affecting the resource. Private rights are significant with regard to withdrawal of ground water, use of land that affects the resource, and use of aquifer storage space through artificial recharge operations. Development of rights in these areas has proceeded at varying rates among the states and has reached differing results, but private rights in general have been relatively ineffective in restraining excessive pumping and other activities adversely affecting the resource. The institutional framework for ground water management also encompasses a variety of statutory laws and programs involving all levels of government, Primary responsibilities of the federal government consist of quality protection and data collection. Developing federal planning procedures have a potentially significant impact on ground water management. In Virginia, state law establishes an administrative ground water allocation system for application within specially designated districts. The state also regulates a number of activities that threaten ground water quality and carries out a data collection and management program. The primary authority of the local level of government concerning ground water is land use control. The development of guidelines for improved ground water management institutions involves a variety of issues. One of the most basic consists of the dgree of governmental involvement and the division of responsibilities among the levels of government. Due to the traditional inability of private control measures to constrain ground water externalities and the need for mechanisms to provide for planning and other non-regulatory management functions, direct governmental involvement and control appear inevitable ag burdens placed on the resource increase, With regard to vesting of governmental authority, considerations of managerial capabilities and perspectives indicate that the state level of government should exercise primary authority. Other issues addressed in the general guidelines and the Virginia recommendations include the feasibility of an allocation program applicable solely to ground water, guidelines for determination of "beneficial use," scope of exemptions from controls, criteria for permit issuance, permit duration, and the scope and administrative structure of ground water quality protection programs.

Browsing by Author "Cox, William E."

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