History of the USDA-ARS Experimental Watersheds on the Washita River, Oklahoma
A national experimental watershed network, operated by the Agricultural Research Service of the US Department of Agriculture, was established in 1959 to conduct research on the effects...

Challenges in Drinking Water Distribution Systems Security Modeling
This paper is on challenges in drinking water distribution systems security modeling connected to OCMS, addressing research and practical issues coming-out from two recent activities which...

Hurricane Katrina
This chapter provides an overview of Hurricane Katrina, including data on its category, its path and intensity, and its effect on wind and water forces....

Direct Causes of the Catastrophe
This chapter examines direct physical causes of the hurricane protection system failures, including soil strength assessments and pumping station limitations....

Introduction
Permafrost is defined as soil that remains frozen for more than two years. At elevations less than 304.8 m (1000 ft.), it is frequently encountered north of latitude 60. It may also be...

The Need for Geotechnical Investigation
Knowledge of the subsurface conditions is needed to decide which type of foundation to use. In the discontinuous permafrost zone, some generalizations may be made about the location of...

Structurally Enhanced Foundations: A Functional Solution to Thaw Strain in Frozen Sand and Gravel
Some building sites with perennially frozen soil profiles are developed using nonelevated, conventional-appearing foundation systems. These sites consist of frozen sands and gravels and...

Post and Pad
As the name implies, this type of foundation consists of a concrete or wood pad placed on or buried in the ground. It is the lowest priced option for buildings on frozen silt, which may...

Adjustable Foundation Design Development Innovations in Arctic Engineering
The purpose of adjustable foundation systems is to accommodate a wide variety of soils, including those which have low bearing capacity or which may be subject to settlement and/or horizontal...

Some Case Histories of Pile Foundations in Permafrost
Foundations for permafrost conditions should conform to one of three basic design principles: keep it frozen, let it thaw, or thaw the ground before construction. To keep the permafrost...

Refrigerated Foundations
Refrigeration systems used to cool foundations on frozen ground can be classified as either active or passive, depending on whether external energy is used to power the systems. If pumps,...

Characterization of Particle Class Sizes Associated with Indicator Organisms in Stormwater
The presence of pathogen indicators is the leading cause of water body impairment in the United States, accounting for over 15% of the waters currently requiring TMDL development (USEPA,...

Simulation/Optimization Modeling Post-Audits
S/O models have long been used to compute optimal strategies for user-specified optimization problems. It is useful to provide a retrospective of two S/O modeling applications, and how...

Characterizing the Pathways and Characteristics of Nutrients Discharging from Ground-Water to Surface Water
Any investigation of surface-water quality for a lake or pond requires accurate estimates of the contributing contaminant or nutrient loads. In many cases, inflow from the adjacent ground...

Characterization of Interaction of Surface Water and Groundwater in the El Paso Lower Valley of Texas
El Paso is located in the Chihuahua desert and prone to long periods of extreme drought. With the river drought, regional irrigation districts only received 34% and 38%of a full water...

Drinking Water Distribution Systems: A Dual-Use Vision for Implementing an Environmental Observatory for an Engineered System
The U.S. Environmental Protection Agency (EPA), under Homeland Security Presidential Directive 7, has been tasked as the lead federal agency in protecting water infrastructure in the U.S....

Biological Nutrient Removal (BNR) Operation in Wastewater Treatment Plants
Biological Nutrient Removal (BNR) Operation Wastewater Treatment Plants instructs readers in the theory, equipment, and practical techniques needed to optimize BNR in varied environments,...

Offshore Technology in Civil Engineering
Hall of Fame Papers from the Early Years
Prepared by the Subcommittee on Offshore Technology Conference Support of the Coasts, Oceans, Ports, and Rivers Institute of ASCE. This series presents...

Structures Congress 2006
Structural Engineering and Public Safety
Structures Congress 2006 highlights research in the broad areas of applied structural analysis, optimal structural design, structural control,...

Summary and Analysis of Findings
The purpose of this chapter is to provide an overall perspective of water resources planning being conducted in the fifty states of the United States. Commonalities, variances, and highlights...

 

 

 

 

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