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News Article | April 17, 2017
Site: www.prweb.com

The U.S. Society on Dams has announced the election of new officers of the Society for the positions of President of the Board, Vice President, and Secretary/Treasurer during its recently completed 37th Annual Conference and Exhibition in Anaheim, California. Shown in the picture from left to right: John S. Wolfhope of Freese and Nichols, Austin, Texas, outgoing President. Dean Durkee, Gannett Fleming of Phoenix, Arizona, newly elected Board President. Manoshree Sundaram, Stantec of Chicago, Illinois, newly elected Board Vice President. Denise Bunte Bisnett, Santee Cooper of Mt. Pleasant, South Carolina, newly elected Board Secretary/Treasurer. The U.S. Society on Dams thanks, John S. Wolfhope for his tireless efforts and successful term as Board President. We congratulate Dean Durkee, Manoshree Sundaram and Denise Bunte Bisnett for their election to new leadership positions in the Society. See: http://www.ussdams.org/about/board-of-directors/ _______________________ USSD is a world class organization of engineering professionals dedicated to advancing the environmentally sustainable science of planning, design, construction, operation and maintenance of dams, levees, and associated civil engineering projects. USSD member engineers lead the nation and work with partner organizations worldwide, to resolve the world’s most critical resource problem: access to clean water. USSD engineers lead in the production of clean, renewable hydroelectric power, dam and levee systems for flood protection, projects providing recreational opportunities through dam reservoirs and water projects enabling water-borne transportation.


Jacobson K.S.,University of Wisconsin - Milwaukee | Drew D.M.,Gannett Fleming Inc. | He Z.,University of Wisconsin - Milwaukee
Bioresource Technology | Year: 2011

Microbial desalination cells (MDCs) hold great promise for drinking water production because of potential energy savings during the desalination process. In this study, we developed a continuously operated MDC - upflow microbial desalination cell (UMDC) for the purpose of salt removal. During the 4-month operation, the UMDC constantly removed salts and generated bio-electricity. At a hydraulic retention time (HRT) of 4days (salt solution) and current production of ∼62mA, the UMDC was able to remove more than 99% of NaCl from the salt solution that had an initial salt concentration of 30g total dissolved solids (TDS)/L. In addition, the TDS removal rate was 7.50g TDSL-1d-1 (salt solution volume) or 5.25g TDSL-1d-1 (wastewater volume), and the desalinated water met the drinking water standard, in terms of TDS concentration. A high charge transfer efficiency of 98.6% or 81% was achieved at HRT 1 or 4d. The UMDC produced a maximum power density of 30.8W/m3. The phenomena of bipolar electrodialysis and proton transport in the UMDC were discussed. These results demonstrated the potential of the UMDC as either a sole desalination process or a pre-desalination reactor for downstream desalination processes. © 2010 Elsevier Ltd.


Jacobson K.S.,University of Wisconsin - Milwaukee | Drew D.M.,Gannett Fleming Inc. | He Z.,University of Wisconsin - Milwaukee
Environmental Science and Technology | Year: 2011

Bioelectrochemical desalination is potentially advantageous because of bioenergy production and integrated wastewater treatment and desalination. In this work, the performance and energy benefits of a liter-scale upflow microbial desalination cell (UMDC) were evaluated. The UMDC desalinated both salt solution (NaCl) and artificial seawater, and the removal rate of total dissolved solid (TDS) increased with an increased hydraulic retention time, although TDS reduction in artificial seawater was lower than that in salt solution. Our analysis suggested that electricity generation was a predominant factor in removing TDS (more than 70%), and that other factors, like water osmosis and unknown processes, also contributed to TDS reduction. It was more favorable given the high energy efficiency, when treating salt solution, to operate the UMDC under the condition of high power output compared with that of high current generation because of the amount of energy production; while high current generation was more desired with seawater desalination because of lower salinity in the effluent. Under the condition of the high power output and the assumption of the UMDC as a predesalination in connection with a reversal osmosis (RO) system, the UMDC could produce electrical energy that might potentially account for 58.1% (salt solution) and 16.5% (artificial seawater) of the energy required by the downstream RO system. Our results demonstrated the great potential of bioelectrochemical desalination. © 2011 American Chemical Society.


Koerner R.M.,Drexel University | Hsuan Y.G.,Drexel University | Koerner G.R.,Geosynthetic Institute | Gryger D.,Gannett Fleming Inc.
Geotextiles and Geomembranes | Year: 2010

The need for a geotextile to be used for protection against geomembrane puncture by stones and gravel has been recognized for many years. There are presently several methods available for selecting such geotextiles. This paper, however, focuses on the " GRI-Method" , which was originally based on short-term tests and was extended empirically for long-term performance. The reduction factor for creep behavior (RFCR) is of particular interest since its impact on the resulting geotextile design is the greatest.The paper presents results of a 10-year long creep puncture study which is configured exactly the same as was the original short-term testing program. The results indicate that the six ≈38. mm high puncturing cones result in yield of the geomembrane at pressures of 34 and 52. kPa and one even had a small break. The six 12. mm high cones at pressures of 430 and 580 kPa also resulted in geomembrane yield but only by a nominal amount and there were no breaks.As a consequence of these creep test results, the original table for creep reduction factors (RFCR) has been revised into more conservative values. In this regard, the originally published RFCR table should be replaced accordingly. © 2010 Elsevier Ltd.


Salhotra A.M.,Gannett Fleming Inc.
Progress in Molecular Biology and Translational Science | Year: 2012

Contaminated sites, particularly Superfund sites, not only require remediation but also require health risk analysis of the unremediated site. In this chapter, the term risk refers to the probability and the magnitude of adverse human health effects due to the unintended exposure to chemicals at sites that are contaminated or perceived to be contaminated. The quantitative estimation of this risk, the application to define how clean is clean, and the techniques available to mitigate and manage the risk are discussed:Estimation of exposure or dose and the uncertainties inherent in the calculationsQuantitative chemical-specific measures of human toxicity of chemicals used in the RA processThe metrics used to estimate the carcinogenic and noncarcinogenic riskRisk management and the concepts of acceptable riskRisk assessment and risk management of contaminated sites © 2012 Elsevier Inc. All rights reserved.


Niedzielski J.C.,Gannett Fleming Inc.
Geotechnical and Structural Engineering Congress 2016 - Proceedings of the Joint Geotechnical and Structural Engineering Congress 2016 | Year: 2016

The PHX Sky Train project is a key linkage in the City of Phoenix, Arizona, Department of Aviation's multimodal facility which integrates Phoenix Sky Harbor Airport with the City's eastern transit (Valley Metro) hub. This local project consists of a series of different bridge types, built to support the operation of the airport's new transit system, as it stretches from the multi-modal center and 44th St.To the Phoenix Sky Harbor Airport Terminals 3 and 4. These include: (1) steel girder superstructures, (2) cast-in-place post-Tensioned, (3) a precast, pre-stressed post-Tensioned, pedestrian bridge along with (4) a signature cast-in-place structure spanning an airport taxiway. Along with these differing bridge types, came complex geotechnical requirements and in-situ conditions. The design of the large diameter drilled shafts supporting the elevated guideway was complicated by space constraints, due to the elevated guideway alignment being situated adjacent to existing buildings, retaining walls, a baggage cart tunnel, and between an existing retaining wall and an existing high-pressure jet fuel line, all of which had to remain in service during construction. The foundation system supports relatively high axial loads, lateral loads and moments due to the height of the guideway above the ground surface, where it needs to pass over existing concourse walkways, bridges, a taxiway and buildings. The extreme design requirements, together with difficult ground conditions at the site, resulted in several challenges in the design of the deep foundation system. Built under the construction manager-At-risk (CMAR) contract structure, the project was built in multiple phases to accommodate the schedule of the METRO opening in winter 2008. Its design was a puzzle of a series of separate contracts that required tight coordination between multiple designers and stakeholders. Multiple system and design coordination meetings were held by the designers in conjunction with the client (City of Phoenix, Department of Aviation) and the selected contractor. Attendees will take away both technical and managerial lessons-learned from this complex transportation project. Complex environmental demands required a series of innovative design solutions. Moreover, the tight, multi-phase schedule and CM@R design paradigm presented many management challenges which will be discussed. © ASCE.


Yu J.G.,Gannett Fleming Inc.
2015 Joint Rail Conference, JRC 2015 | Year: 2015

This paper describes the computer simulation methods for DC traction power systems and ac power traction power systems that have been used to develop the computer simulator TAROS® at Gannett Fleming. The simulator has been designed and developed to support both load flow analysis and fault analysis [1]. The paper also presents some examples of practical applications of the simulator in engineering and design under various operational conditions that may be encountered in transit and rail systems, such as normal, abnormal and fault conditions. Examples include: electric load cycles in various system components for their rating and size selection or verification; distribution of traction return currents in return conductors and ground for electromagnetic interference assessment; touch and step voltage analysis for the design of the traction return system grounding and bonding to meet safety requirements; and fault calculations for relay protection coordination. Copyright © 2015 by ASME.


Patent
Gannett Fleming Inc. | Date: 2011-05-24

An apparatus and method for the monitoring of scour in a streambed at a site. The apparatus has a support member and at least one float sensor attached to the support member. The at least one float sensor is buried in the streambed and has a switch device, with the switch device being movable between a first position and a second position. As a scour event occurs which causes the streambed to be eroded beyond the at least one float sensor, the at least one float sensor will rise causing the switch device to be moved from the first position to the second position.


Patent
Gannett Fleming Inc. | Date: 2014-03-14

A device and method for finishing a surface of a work piece. The device includes a finishing apparatus which cooperates with the surface of the work piece. A mounting member is provided which cooperates with the surface of the work piece to removably mount the device to the surface of the work piece. At least one support member extends between the mounting member and the finishing apparatus. The finishing apparatus is moveable relative to the mounting member to allow the finishing apparatus to perform a finishing operation on the surface of the work piece.


Trademark
Gannett Fleming Inc. | Date: 2013-10-14

computer software for the planning, design, construction, analysis and management of the transit rail industry. Engineering services, namely, planning, design, construction, analysis and management of the transit rail industry.

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