News Article | April 17, 2017
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.
Wurbs R.A.,Texas A&M University |
Ayala R.A.,Texas A&M University |
Ayala R.A.,Freese and Nichols Inc.
Journal of Hydrology | Year: 2014
The role of reservoir surface evaporation in river/reservoir water budgets and water management is explored using a modeling system that combines historical natural hydrology with current conditions of water resources development and management. The long-term mean evaporation from the 3415 reservoirs in the Texas water rights permit system is estimated to be 7.53 billionm3/year, which is equivalent to 61% of total agricultural or 126% of total municipal water use in the state during the year 2010. Evaporation varies with the hydrologic conditions governing reservoir surface areas and evaporation rates. Annual statewide total evaporation volumes associated with exceedance probabilities of 75%, 50%, and 25% are 7.07, 7.47, and 7.95 billionm3/year, respectively. Impacts of evaporation are greatest during extended severe droughts that govern water supply capabilities. © 2013 Elsevier B.V.
Rao B.,Texas Tech University |
Anderson T.A.,Texas Tech University |
Redder A.,Freese and Nichols Inc. |
Jackson W.A.,Texas Tech University
Environmental Science and Technology | Year: 2010
The environmental occurrence of perchlorate (ClO4) can be related to either natural or anthropogenic sources. Recent studies highlighted the ubiquitous occurrence of natural ClO4 in the environment including wet deposition in the United States. Limited studies have investigated potential mechanisms responsible for natural ClO4 production in the environment. These studies have neither addressed the influence of relevant reaction conditions nor have they evaluated the rates of ClO4 production. The purpose of this study was to determine the comparative yields and rates of ClO4 production from O3 mediated oxidation of Cl, OCl, ClO2, ClO3, and ClO2. The influence of reactant (O3 and ClOx) concentration and pH were evaluated. The comparative rate and efficiency of ClO4 production is generally greater for higher oxidation states of Cl (2.7 to 0.5% for ClO 2/ClO2 and 0.02 to 0.005% for OCl/HOCl oxidation) with the notable exception of ClO3 which does not react with O3. The very slow rate of ClO4 production from Cl (?20 - 109 mM min1) even at elevated O3 and Cl concentrations implies negligible potential for anthropogenic ClO4 formation in process units of water/wastewater systems that use O3 for treatment. Based on results of ClO4 formation from tested Cl species and available literature, we propose a potential formation pathway for ClO4 from Cl with emphasis on the role of ClO2 and higher oxy-chlorine radicals/intermediates (e.g., Cl2O6) in its formation. © 2010 American Chemical Society.
Maughn S.,Freese and Nichols Inc.
Pipelines 2014: From Underground to the Forefront of Innovation and Sustainability - Proceedings of the Pipelines 2014 Conference | Year: 2014
Being a design engineer and project manager of more than 100 miles of large-diameter pipeline projects (greater than 36-in. diameter) and installation has led to the privilege of witnessing multiple contractors and different installation techniques of pipe joint protection sleeves. This also has led to the experience of seeing corrosion problems on polyurethane-coated steel pipelines at pipe joints that can many times be related to poorly installed joint protection shrink sleeves. It has also exposed how the installation techniques and knowledge varies from contractor to contractor and even from work crew to work crew. A growing experience and understanding led to the realization that the heat-shrink sleeves were an important key to protecting one of the most vulnerable areas of the pipe during the installation process, which also led to the need to try and provide owners with quality installation of these products. In gasketed and weld-after-backfill installation techniques, the heat-shrink sleeves provide a very important protection layer to the steel pipe at these crucial points along the pipeline. A majority of the leaks and failures on pipelines are at the joints no matter what material the pipeline happens to be, so the need to find a way to ensure a better quality installation of the heat-shrink sleeves on polyurethane-coated steel pipes became apparent. Therefore, after witnessing several projects where a field representative of the heat-shrink sleeve manufacturer came out on site and performed field testing and installation instruction with the contractor crew members, the need was apparent for design engineers and resident representatives to conduct testing on heat-shrink sleeves. This would provide the opportunity to catch errors or improper installation techniques early on in the pipeline construction to try and minimize future corrosion problems that could potentially cause leaks or damage on the line. This testing started being performed at the very beginning of pipeline installation to verify the sleeves are properly installed and performing as they are intended for the protection of the pipeline joints. Data and information will be presented on how and when to perform the testing, what to look for, how to follow up with the contractor's crew, and how to convey testing results with the manufacturer's representative if necessary. Addressing this testing in the specifications of each project will also be addressed. These tests have been very valuable and have positively corrected poorly installed heat-shrink sleeves on pipeline projects. These tests are simple, but very effective and when performed early in the construction process, can help protect multiple areas of vulnerability along many miles of large-diameter pipelines. © 2014 American Society of Civil Engineers.
Hutson A.C.,Freese and Nichols Inc. |
Ickert R.A.,Freese and Nichols Inc.
World Environmental and Water Resources Congress 2012: Crossing Boundaries, Proceedings of the 2012 Congress | Year: 2012
Water is essential for human life and necessary for economic development and growth. One could argue that nowhere is sustainability more important than in maintaining a safe, dependable water supply, especially in the semi-arid Southwestern United States. While the LEED program has emphasized sustainability in facility design, civil infrastructure projects have lagged behind to some degree. This paper reviews some of the concepts of sustainability for water supply projects and the importance of developing a water supply that meets the current needs of a population while looking forward to the needs of future generations. The paper also includes a brief summary of the new rating system developed by the Institute for Sustainable Infrastructure (ISI). The goal of the EnvisionTM rating system is to establish a holistic approach to evaluating and rating infrastructure projects posing two questions: "Did we do the right project?" and "Did we do the project right?" This holistic approach is especially necessary in looking at water supply planning and design. The overall sustainability of a water supply project should be considered in each project phase. A typical water supply project includes planning, design, construction, and operations and maintenance phases. While project costs and overall sustainability can be impacted in each phase, the planning phase contains the most opportunities to reduce costs and increase sustainability. Big-picture, conceptual planning is typically the first phase in implementing a new water supply project. Once the need for the project is established, the best means for meeting that need should be determined. With the correct project defined, the emphasis in preliminary and final design is on doing the project right. In the case of a water transmission project, one should verify that pipeline routes and pumping facilities balance the triple bottom line (people, profit, planet) by reducing environmental impact, reducing power consumption, considering installation techniques, incorporating recycled materials, increasing the project life, balancing social impacts, and developing system operating practices so components can be operated efficiently to save water, energy, and money over time. Tools used for the planning and design phases include system modeling, life-cycle cost analysis, and carbon footprint comparisons. Applying the principles of sustainability in the operations and maintenance phase is also important to reduce power consumption and increase the life of existing assets. This includes preventive maintenance activities and using newer tools such as GIS, modeling, and inspection equipment to implement an asset management and condition assessment program. © 2012 ASCE.
Hekman S.H.,Freese and Nichols Inc.
AWWA/AMTA Membrane Technology Conference and Exposition 2012 | Year: 2012
Brown County Water Improvement District No. 1 (BCWID) is a wholesale supplier of raw water used for irrigation and treated water used for municipal purposes in Brown and Coleman Counties of West Texas. Raw water is pumped from Lake Brownwood for treatment at BCWID's water treatment plants where it is then treated and delivered to wholesale customers. To meet increasing customer demand for water, BCWID hired Freese and Nichols to perform an evaluation of the District's existing water treatment plants in 2001. The need for at least 7.5 MGD additional treated water capacity was identified. The District's source water of Lake Brownwood historically has extremely good water quality: low turbidity averaging 5 NTUs and low organics of around 2 - 4 mg/l, which makes it ideal for membrane consideration. In the summer of 2003, a pressure type microfiltration (MF) system was selected for pilot testing to evaluate the feasibility of a membrane treatment system. The pilot test in winter 2003-2004 confirmed that no pre-treatment other than an oxidant was required, and the system was given one of the highest flux rates approved in Texas (80 gpd/sf). After construction and operation of the membrane plant, the design team performed a side-by-side comparison of membrane (7.5 MGD) and a conventional (7.5 MGD) treatment plant expansion, and determined that due to high water quality and reduced chemical costs; BCWID saved $3.6 million by selecting an integrated membrane treatment plant expansion over a conventional treatment plant expansion. Future expansion would save an estimated $1.6 Million per MGD. Since completion of the project, the plant has demonstrated a 23% reduced operational cost for the membrane plant when compared to the existing conventional plant. This paper highlights the unique advantages of the completed, integrated 7.5 MGD conventional and 7.5 MGD membrane plant and identifies some lessons learned with regard to approaching this type of project in the future. Specific topics include: 1. Flexibility of integrating the plant piping and hydraulics to function in a separate parallel conventional/membrane mode or with conventional as pre-treatment for the membrane plant, 2. Flexibility in having common components such as raw water terminal storage, clearwells, high service pumping, and chlorine and ammonia feed facilities, 3. Cross-training plant staff in both conventional and membrane operations and maintenance, and 4. Integration of regulatory reporting. © 2012 American Water Works Association.
Cecil S.,Freese and Nichols Inc. |
Bennett D.,Freese and Nichols Inc.
Pipelines 2016: Out of Sight, Out of Mind, Not Out of Risk - Proceedings of the Pipelines 2016 Conference | Year: 2016
In the interest of further diversifying their water supply, New Braunfels Utilities (NBU), a growing water provider, developed a new well field in the Trinity Aquifer. Integration of this new source into an expanding system and pipeline network required an analysis of how the water could be transferred through the system to high demand areas, in conjunction with the existing operating parameters and other water supply sources utilized by NBU. A modeling analysis of the existing distribution pipeline network and future operations was developed to determine the optimal approach to move water through the system. Different options were evaluated to distribute the additional water throughout the system, while maintaining operational flexibility for NBU to supply water through their different supply sources. Examining the quantitative means and methods to move this new water source throughout NBU's system proved extremely beneficial to NBU and demonstrated the impacts a new water source can have on system operations both short and long term. This paper will discuss the unique requirements of integrating a new water supply into a growing water distribution system, as well as the specific benefits and value that modeling and field testing provides to owners and the Public. © 2016 ASCE.
Herndon C.,Freese and Nichols Inc. |
Brinkley A.,City of Pearland
Pipelines 2016: Out of Sight, Out of Mind, Not Out of Risk - Proceedings of the Pipelines 2016 Conference | Year: 2016
Large diameter gravity trunk sewer pipelines are a critical component of municipal infrastructure. Weaving a large, critical piece of infrastructure through city streets and easements has significant challenges that must be considered heavily in the planning, routing and preliminary design of the project. Similarly, pipeline owners face challenges in the operation and maintenance of the trunk sewer including inflow and infiltration, damage from corrosion and difficulty accessing the line in deep locations. © 2016 ASCE.
Hekman S.H.,Freese and Nichols Inc.
American Water Works Association Annual Conference and Exposition 2012, ACE 2012 | Year: 2012
The City of Cleburne water system features a variety of water supplies to meet its current water demands including: surface water (Lake Pat Cleburne and Aquilla Lake), groundwater, reclaimed reuse water, and conservation. The need for more water has led the City to develop a water supply contract with the Brazos River Authority (BRA) to withdraw water from Lake Whitney, a long-disregarded secondary source that receives occasional spikes of high salinity. Using a novel treatment approach that combines blending and reverse osmosis (RO), the City has a unique ability to address the salinity concerns of Lake Whitney to increase its water supply. To overcome the intermittent higher salinities of Lake Whitney, the blending process would involve construction of a total dissolved solids (TDS) scalping plant that would treat Lake Whitney water using RO only to a level that, when blended with Aquilla Lake water, would not sufficiently change the level of salinity in either Lake Pat Cleburne or Aquilla Lake nor exceed current Texas Surface Water Quality Standards. Using a water quality modeling process, the system maintains quality of blending sources and provides a high-quality raw water to the City's conventional water treatment plant. At the heart of this project is the first known TDS-scalping plant in the state of Texas, which will limit energy expenses and heighten overall water quality. In addition to increasing the City's water supplies, the design of an RO plant for treating Lake Whitney water enables the opportunity to provide potable water supply for surrounding entities. The City is currently nearing the end of pre-design for the Lake Whitney development and has begun pursuing environmental clearance before commencing final design. This paper provides an overview and current status of this project-the first use of Lake Whitney as a municipal water supply source.
Gibson R.,Freese and Nichols Inc.
Pipelines 2012: Innovations in Design, Construction, Operations, and Maintenance - Doing More with Less - Proceedings of the Pipelines 2012 Conference | Year: 2012
For much of Texas, the drought of 2011 is the most severe one-year drought on record. Climatologists predict the drought will continue for the foreseeable future. Additionally, Texas continues to grow rapidly in many metropolitan areas. These and other factors put pressure on existing water supplies to meet demands. In response, some water suppliers have been forced to develop new supplies on an emergency basis. The compressed schedule of design, permitting and construction offers many challenges to the designer, owner and builder. This paper offers concepts for expediting the planning, design, permitting, survey, land acquisition and construction of water supply projects. A comparison of the critical path for a normal schedule and expedited schedule is presented for water supply projects. The comparison presents potential solutions to expedite the project schedule, including the following: 1) Alternate procurement methods for major equipment items, 2) Alternate delivery methods for construction including Design-Bid-Build, Design-Build and Construction Manager-at-Risk, 3) Splitting the project construction contracts to expedite construction, 4) Survey and easement acquisition for speed, 5) Design concepts to expedite environmental permitting of intake structures and pipelines, 6) Project management of planning, design and construction, and 7) Technology tools for managing design and construction This paper will also provide case studies and lessons learned from three fast-track water supply projects in Texas. Project A: Design and construction of a 156-mile pipeline, 7 pump stations, 5 electric substations, a 100 million gallon storage reservoir and other facilities in 38 months. Project B: Design, permitting and construction of a new surface water supply including a 30-mile pipeline, intake pump station and booster pump station in 27 months. Project C: Design, permitting, and construction of a new groundwater well field, 65 miles of pipeline, and four pump stations in 18 months. © 2012 American Society of Civil Engineering.