Environmental Engineering
Environmental Assessment and Risk Screening for Rural Water Supply
Extending and sustaining access to WASH services remains vital for poverty reduction in sub-Saharan Africa (SSA), and is the central objective of the DFID-funded WASH Results Programme (WRP). Achieving long-term increases in coverage depends on many factors, including sound financing, community engagement in the design and implementation of schemes, and the training of village mechanics, local government and entrepreneurs in system upkeep and repair.
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Design Development of a Novel Sour Water Stripper
Sour water units are integral units in the refineries Proposed vapor compression design offers: Hot utilities reduction of 90%, Cold utilities reduction of 22%, TAC reduction by 52%.
Design Development of a Novel Sour Water Stripper
Sour water units are integral units in the refineries Proposed vapor compression design offers: Hot utilities reduction of 90%, Cold utilities reduction of 22%, TAC reduction by 52%.
Climate Variability and Change in the 21st Century.
Water resources management should be assessed under climate change conditions, as historic data cannot replicate future climatic conditions. - Climate change impacts on water resources are bound to affect all water uses, i.e., irrigated agriculture, domestic and industrial water supply, hydropower generation, and environmental flow (of streams and rivers) and water level (of lakes). - Bottom-up approaches, i.e., the forcing of hydrologic simulation models with climate change models’ outputs, are the most common engineering practices and considered as climate-resilient water management approaches. - Hydrologic simulations forced by climate change scenarios derived from regional climate models (RCMs) can provide accurate assessments of the future water regime at basin scales.
Climate Variability and Change in the 21st Century.
Water resources management should be assessed under climate change conditions, as historic data cannot replicate future climatic conditions. - Climate change impacts on water resources are bound to affect all water uses, i.e., irrigated agriculture, domestic and industrial water supply, hydropower generation, and environmental flow (of streams and rivers) and water level (of lakes). - Bottom-up approaches, i.e., the forcing of hydrologic simulation models with climate change models’ outputs, are the most common engineering practices and considered as climate-resilient water management approaches. - Hydrologic simulations forced by climate change scenarios derived from regional climate models (RCMs) can provide accurate assessments of the future water regime at basin scales.
Moving Toward Sustainability: Sustainable And Effective Practices For Creating Your Water Utility Roadmap
Introduction:
Sustainable water and wastewater services are critical to providing the American public with clean and safe water and helping ensure the environmental, economic, and social sustainability of the communities that utilities serve. Utilities across the country face tremendous challenges, such as aging infrastructure, an aging workforce, increasing mandates, and competing priorities within the communities they serve.
The purpose of this document is to assist utility leaders with implementing proven and effective practices over time to improve their operations and move toward sustainability, at a pace consistent with their needs and the needs of their communities. It provides utility leaders with a cohesive structure to help them address various challenges proactively and with confidence. The practices described in this document reflect the lessons learned and the practical experience utilities have derived as they have improved their operations. A utility can use this document to identify specific opportunities for improvement and draw on the example practices to create an individualized “roadmap” to more sustainable operations.
Moving Toward Sustainability: Sustainable And Effective Practices For Creating Your Water Utility Roadmap
Introduction:
Sustainable water and wastewater services are critical to providing the American public with clean and safe water and helping ensure the environmental, economic, and social sustainability of the communities that utilities serve. Utilities across the country face tremendous challenges, such as aging infrastructure, an aging workforce, increasing mandates, and competing priorities within the communities they serve.
The purpose of this document is to assist utility leaders with implementing proven and effective practices over time to improve their operations and move toward sustainability, at a pace consistent with their needs and the needs of their communities. It provides utility leaders with a cohesive structure to help them address various challenges proactively and with confidence. The practices described in this document reflect the lessons learned and the practical experience utilities have derived as they have improved their operations. A utility can use this document to identify specific opportunities for improvement and draw on the example practices to create an individualized “roadmap” to more sustainable operations.
Advances in Evaporation and Evaporative Demand
The importance of evapotranspiration is well-established in different disciplines such as hydrology, agronomy, climatology, and other geosciences. Reliable estimates of evapotranspiration are also vital to develop criteria for in-season irrigation management, water resource allocation, long-term estimates of water supply, demand and use, design and management of water resources infrastructure, and evaluation of the effect of land use and management changes on the water balance. The objective of this Special Issue is to define and discuss several ET terms, including potential, reference, and actual (crop) ET, and present a wide spectrum of innovative research papers and case studies.
Advances in Evaporation and Evaporative Demand
The importance of evapotranspiration is well-established in different disciplines such as hydrology, agronomy, climatology, and other geosciences. Reliable estimates of evapotranspiration are also vital to develop criteria for in-season irrigation management, water resource allocation, long-term estimates of water supply, demand and use, design and management of water resources infrastructure, and evaluation of the effect of land use and management changes on the water balance. The objective of this Special Issue is to define and discuss several ET terms, including potential, reference, and actual (crop) ET, and present a wide spectrum of innovative research papers and case studies.
Impacts of Anthropogenic Activities on Watersheds in a Changing Climate
The immediate goal of this Special Issue was the characterization of land uses and occupations (LULC) in watersheds and the assessment of impacts caused by anthropogenic activities. The goal was immediate because the ultimate purpose was to help bring disturbed watersheds to a better condition or a utopian sustainable status. The steps followed to attain this objective included publishing studies on the understanding of factors and variables that control hydrology and water quality changes in response to human activities. Following this first step, the Special Issue selected work that described adaption measures capable of improving the watershed condition (water availability and quality), namely LULC conversions (e.g., monocultures into agro-forestry systems). Concerning the LULC measures, however, efficacy was questioned unless supported by public programs that force consumers to participate in concomitant costs, because conversions may be viewed as an environmental service.
Impacts of Anthropogenic Activities on Watersheds in a Changing Climate
The immediate goal of this Special Issue was the characterization of land uses and occupations (LULC) in watersheds and the assessment of impacts caused by anthropogenic activities. The goal was immediate because the ultimate purpose was to help bring disturbed watersheds to a better condition or a utopian sustainable status. The steps followed to attain this objective included publishing studies on the understanding of factors and variables that control hydrology and water quality changes in response to human activities. Following this first step, the Special Issue selected work that described adaption measures capable of improving the watershed condition (water availability and quality), namely LULC conversions (e.g., monocultures into agro-forestry systems). Concerning the LULC measures, however, efficacy was questioned unless supported by public programs that force consumers to participate in concomitant costs, because conversions may be viewed as an environmental service.
Theory and Practice of Tunnel Engineering
Tunnel construction is expensive when compared to the construction of other
engineering structures. Detailed surveys indicate that the cost of a tunnel support
system ranges between 30 and 50 percent of the total project cost, and can sometimes
reach upwards of 70 percent. Currently, theoretical studies and experiences
obtained from large projects indicate that costs can be reduced by increasing the
efficiency of rock load estimation and support design. In other words, the selection
of a support system or systems suitable for rock mass conditions encountered during
construction processes plays an important role in reducing project costs. Methods
based on rock-support interaction introduce rational solutions for economical and
safe tunneling because they provide a good combination of design and construction
processes.
Theory and Practice of Tunnel Engineering
Tunnel construction is expensive when compared to the construction of other
engineering structures. Detailed surveys indicate that the cost of a tunnel support
system ranges between 30 and 50 percent of the total project cost, and can sometimes
reach upwards of 70 percent. Currently, theoretical studies and experiences
obtained from large projects indicate that costs can be reduced by increasing the
efficiency of rock load estimation and support design. In other words, the selection
of a support system or systems suitable for rock mass conditions encountered during
construction processes plays an important role in reducing project costs. Methods
based on rock-support interaction introduce rational solutions for economical and
safe tunneling because they provide a good combination of design and construction
processes.
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