Delineation of Wellhead Protection Areas: Theory and Practice

1991 ◽  
Vol 24 (11) ◽  
pp. 239-250 ◽  
Author(s):  
Tereza C. B. F. Cleary ◽  
Robert W. Cleary
Keyword(s):  
United States ◽  
Groundwater Protection ◽  
Numerical Models ◽  
The United States ◽  
Pollution Sources ◽  
Theory And Practice ◽  
Safe Operation ◽  
Wellhead Protection ◽  
Protection Area ◽  
Potential Pollution

A preventive approach in groundwater protection programs throughout Europe and the United States, and almost unknown in Brazil, is to define the surface and subsurface areas, the Wellhead Protection Area (WHPA), from which a well or wellfield draws its water during a specified time. Overlaying a map of potential pollution sources on the delineated WHPA (Figure 1), those sources which fall within the WHPA boundaries are identified as definite threats, that need to be closely monitored, to the continued safe operation of the wellfield. Given the importance of effectively delineating the WHPA to protect public water supplies, the current delineation criteria, methods, and zones are presented, as well as analytical and numerical PC model analyses of different hydrogeological scenarios' effects on WHPA's size, shape and direction. Numerical models are shown to more accurately define WHPAs by taking into account the surrounding heterogeneous and anisotropic geology.

Development and Applications of a Wellhead Protection Area Delineation Computer Program

1991 ◽  
Vol 24 (11) ◽  
pp. 51-62 ◽  
Author(s):  
N. Guiguer ◽  
T. Franz
Keyword(s):  
Case History ◽  
Numerical Models ◽  
Groundwater Resources ◽  
Theoretical Background ◽  
Human Interaction ◽  
Wellhead Protection ◽  
First Case ◽  
Protection Area ◽  
And Storage ◽  
The Town

In the last few years, groundwater management has concentrated on the protection of groundwater quality. An increasing number of countries has adopted policies to protect vital groundwater resources from deterioration by regulating human interaction with the subsurface, the use of potential contaminants, land use restrictions, and waste transport and storage. One of the more common regulatory approaches to the protection of groundwater focuses on public water supplies to reduce the potential of human exposure to hazardous contaminants. Under the framework of the Safe Drinking Water Act amended by U.S. Congress in 1986, The U.S.EPA (1987) issued guidelines for the delineation of wellhead protection areas, recommending the use of analytical and numerical models for the identification of such areas. In this study, the theoretical background for the development of one such numerical model is presented. Two real-world applications are discussed: in the first case history, the model is applied to a Superfund Site in Puerto Rico as a tool for assessment of the effectiveness of a proposed pump-and-treat scheme for aquifer remediation. Based on simulation results for the evolution of the existing contaminant plume it was verified that such a scheme would not work with the proposed purging wells. The second case history is the delineation of a wellhead protection area in the Town of Littleton, Massachusetts, and subsequent design of a monitoring well network.

An Assessment of Simulations on an : International Organization

1985 ◽  
Vol 47 ◽  
pp. 4-5
Author(s):  
Paul F. Diehl ◽  
Michael J. Montgomery
Keyword(s):  
United States ◽  
United Nations ◽  
Political Science ◽  
International Organizations ◽  
Recent Literature ◽  
The United States ◽  
Theory And Practice ◽  
International Organization ◽  
Potential Value ◽  
Existing Structure

Simulation is an increasingly popular pedagogical device; much of the recent literature on the theory and practice of political science instruction attests to this. Probably the most popular simulation device is called model United Nations. In recent articles in Teaching Political Science and NEWS for Teachers of Political Science, William Hazelton and James Jacob have described Model United Nations in glowing terms, focusing on one particular conference and completely ignoring the rest of the 200 or more conferences held annually across the United States.Like Jacob and Hazelton, we recognize the great potential value of United Nations simulations in trying to illuminate the often confusing politics of international organizations. As former participants and directors of these programs, however, we are keenly aware of the shortcomings and difficulties associated with the existing structure of model U.N. programs.

Media coverage of the unfolding crisis of domestic terrorism in the United States, 1990–2020

2021 ◽  
pp. 2046147X2199601
Author(s):  
Diana Zulli ◽  
Kevin Coe ◽  
Zachary Isaacs ◽  
Ian Summers
Keyword(s):  
United States ◽  
Public Relations ◽  
Crisis Management ◽  
Media Coverage ◽  
Television News ◽  
News Coverage ◽  
The United States ◽  
Theory And Practice ◽  
Domestic Terrorism ◽  
Definitional Uncertainty

Public relations research has paid considerable attention to foreign terrorist crises but relatively little attention to domestic ones—despite the growing salience of domestic terrorism in the United States. This study content analyzes 30 years of network television news coverage of domestic terrorism to gain insight into four theoretical issues of enduring interest within the literature on news framing and crisis management: sourcing, contextualization, ideological labeling, and definitional uncertainty. Results indicate that the sources called upon to contextualize domestic terrorism have shifted over time, that ideological labels are more often applied on the right than the left, and that definitional uncertainty has increased markedly in recent years. Implications for the theory and practice of public relations and crisis management are discussed.

Insurance: Its Theory and Practice in the United States.

1956 ◽  
Vol 11 (1) ◽  
pp. 92
Author(s):  
Helen C. Potter ◽  
Albert H. Mowbray ◽  
Ralph H. Blanchard
Keyword(s):  
United States ◽  
The United States ◽  
Theory And Practice

Immigrant Entrepreneurship: The Effect of Early Career Immigration Constraints on New Venture Formation

2021 ◽  
Author(s):  
Rajshree Agarwal ◽  
Martin Ganco ◽  
Joseph Raffiee
Keyword(s):  
United States ◽  
Human Capital ◽  
The United States ◽  
Early Career ◽  
Theory And Practice ◽  
New Venture ◽  
Opportunity Costs ◽  
Paid Employment ◽  
Specialized Human Capital ◽  
New Venture Formation

We examine how institutional factors may affect microlevel career decisions by individuals to create new firms by impacting their ability to exercise entrepreneurial preferences, their accumulation of human capital, and the opportunity costs associated with new venture formation. We focus on an important institutional factor—immigration-related work constraints—given that technologically intensive firms in the United States not only draw upon immigrants as knowledge workers but also because such firms are disproportionately founded by immigrants. We examine the implications of these constraints using the National Science Foundation’s Scientists and Engineers Statistical Data System, which tracks the careers of science and engineering graduates from U.S. universities. Relative to natives, we theorize and show that immigration-related work constraints in the United States suppress entrepreneurship as an early career choice of immigrants by restricting labor market options to paid employment jobs in organizational contexts tightly matched with the immigrant’s educational training (job-education match). Work experience in paid employment job-education match is associated with the accumulation of specialized human capital and increased opportunity costs associated with new venture formation. Consistent with immigration-related work constraints inhibiting individuals with entrepreneurial preferences from engaging in entrepreneurship, we show that when the immigration-related work constraints are released, immigrants in job-education match are more likely than comparable natives to found incorporated employer firms. Incorporated employer firms can both leverage specialized human capital and provide the expected returns needed to justify the increased opportunity costs associated with entrepreneurial entry. We discuss our study’s contributions to theory and practice.

Uniformity of Terminology for Circular Intersection Designs

2018 ◽  
Vol 2672 (34) ◽  
pp. 63-72
Author(s):  
Joe Gustafson
Keyword(s):  
United States ◽  
Autonomous Vehicles ◽  
Design Education ◽  
The United States ◽  
Road User ◽  
Policy Enforcement ◽  
Traffic Enforcement ◽  
Safe Operation ◽  
The World ◽  
Mixed Messages

Most transportation engineers around the world, and now in the United States, are relatively familiar with roundabouts and their operational and safety benefits. Although roundabouts are becoming increasingly common, drivers and even engineering professionals often contend with mixed messages about roundabout design and operation. In a world speckled with all manner of spiral roundabouts, signalized roundabouts, traffic circles, gyratories, and rotaries, is it any wonder that confusion, and public resistance, often persists? These mixed messages may represent the greatest hurdle to implementation, public acceptance, and safe operation of multi-lane roundabouts in particular. Within North America and across the globe, circular intersection designs that appear relatively similar to users can in fact require significantly different driver behaviors, depending on whether they are configured with a continuous circle road or a network of crossing roadways. This distinction can be of critical importance for roadway designers and agencies, elected officials and other policymakers, road user education and licensing, traffic enforcement, mapping and GPS navigation, and safe operation of autonomous vehicles. This paper aims to provide an overview of existing definitions, explore the nature of conflict points for each design, provide a framework modeling method for analysis, and provide globally applicable definitions for roundabout features for use in design, education, policy, enforcement, and research. This paper is focused primarily on roundabout design guidance and operations within the United States, but places these practices within the global context, such that the definitions and analyses provided can be applied to all forms of roundabout intersections around the world.

scholarly journals Contents and features of intramural (in-school) sports in the USA

2020 ◽  
pp. 143-147
Author(s):  
I. Turchyk ◽  
R. Chopyk ◽  
N. Kizlo
Keyword(s):  
United States ◽  
Physical Education ◽  
Information Technologies ◽  
The United States ◽  
Theory And Practice ◽  
Successful Implementation ◽  
Intramural Sports ◽  
School Sports ◽  
Motor Activities ◽  
The Usa

The study and generalization of foreign experience is a value for Ukraine, which has set itself the task of integration into the world community and can be an important source of thorough thinking and creative use of positive ideas in domestic theory and practice of physical education and sports. This article analyzes the content and features of the organization of intramural (in-school) sports in the United States. The study found that intramural sports in the United States are an integral part of the overall education program, which provides an opportunity to involve children with different levels of development of motor skills and qualities in motor activities outside of physical education lessons. Participation in intramural sports programs is voluntary. It is determined that the intramural sports program in the United States is characterized by certain features that must be taken into account for its successful implementation. It was found that, first of all, American specialists determine the direction (nature) of the sports program and possible types of physical activity, taking into account the wishes of students; it is important to properly plan and compile a quality schedule for classes in compliance with the capacity of existing sports facilities; it is obligatory to observe the rules of admission of students to classes and competitions, as well as their annual medical examination; implementation of the sports program is carried out with the use of modern information technologies; the accounting and evaluation of the program is constantly carried out; proper administration and quality arbitration are of great importance; special attention is paid to the competition procedure itself and the determination of winners; a special place is given to the financing of programs and their support and promotion.

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