Browsing Civil and Environmental Engineering by Title
Now showing items 701-720 of 881
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Recoupling the Livestock Nutrient Economy: A Path forward for Water Quality Improvement
(University of Waterloo, 2019-09-23)Intensification of farming operations and increased nutrient application rates have led to higher crop yields and greater food security. At the same time, widespread use of commercial nitrogen (N) and phosphorus (P) ... -
Recycled Concrete Aggregate – A Viable Aggregate Source For Concrete Pavements
(University of Waterloo, 2010-01-06)Virgin aggregate is being used faster than it is being made available creating a foreseeable shortage in the future. Despite this trend, the availability of demolished concrete for use as recycled concrete aggregate (RCA) ... -
Recycled Concrete Aggregate: Influence of Aggregate Pre-Saturation and Curing Conditions on the Hardened Properties of Concrete
(University of Waterloo, 2014-05-13)Recycled concrete aggregate (RCA) is a construction material, which is being used in the Canadian construction industry more frequently than it was in the past. The environmental benefits associated with RCA use, such as ... -
Reduction of chlorendic acid by zero-valent iron: Kinetics, products, and pathways
(Elsevier, 2020-02-15)Chlorendic acid (CA) is a recalcitrant groundwater contaminant for which an effective treatment technology does not currently exist. In this study, a series of batch experiments were conducted to investigate the treatment ... -
Regime Shift Detection Techniques for Determining the Year of Positive 0°C Crossing in the Northern Hemisphere for Late-Winter and Spring
(University of Waterloo, 2011-12-21)The temperature of 0°C, the phase change point of water-ice, is among the most influential factors on the hydrology of the temperate regions that experience winter. Many cryospheric processes, such as snow and ice melt, ... -
Regional Frequency Analysis Estimates of Extreme Rainfall Events under Climate Change
(University of Waterloo, 2020-01-09)Extreme rainfall events have a long history of causing large economic damages in urban areas and even loss of human life. Reliable estimates of extreme rainfall intensities for different rainfall durations are essential ... -
Relating Changes in Extreme Streamflow Events to Changes in Extreme Rainfall Events in Canada
(University of Waterloo, 2016-09-28)The changes in extreme events caused by climate change are likely to have significant impacts in the future. It is expected that climate change will cause changes in rainfall intensities and magnitudes and consequently ... -
Relating Extreme Temperature and Precipitation to Improve IDF Curve Estimates for Ontario in Response to Climate Change
(University of Waterloo, 2017-09-27)Events of extreme precipitation have a huge influence on society. They cause flooding, erosion, and threaten infrastructure, transportation, and safety. Precipitation extremes have increased over the last century (Alexander ... -
Relationship between Short-Term and Long-Term Creep, and the Molecular Structure of Polyethylene
(University of Waterloo, 2009-09-02)Polyethylene has been studied from many different perspectives; a final application property perspective, in which the response of the material to loads is the topic; a micromechanical point of view, in which the macroscopic ... -
Reliability Analysis Using the Method of Multiplicative Dimensional Reduction
(University of Waterloo, 2017-04-25)Traditional engineering analyses and designs are based on deterministic input variables, and variability seen in the real world are often ignored to simplify the work. Formal reliability analyses are generally avoided by ... -
Reliability Assessment of Load Testing for Concrete Buildings
(University of Waterloo, 2015-04-24)Structural rehabilitation is regularly undertaken to diagnose and repair a building during its service life; this practice ensures that buildings operate under safe and reliable conditions. Engineers generally rely on ... -
Reliability-based Environmental Impact Assessment in Geotechnical Engineering
(University of Waterloo, 2023-11-30)A sustainable design is achieved by balancing the four aspects, so called the four Es, of sustainability – environment, economy, equity, and engineering. Given that geotechnical constructions involve land transformations ... -
Remediation of Weathered Light Nonaqueous Phase Liquids by Persulfate: In-Situ Performance Assessment and Numerical Modeling
(University of Waterloo, 2021-08-25)Light nonaqueous phase liquids (LNAPLs) petroleum hydrocarbons (PHCs) subsurface contamination is complex and poses considerable risks to human health and the environment. The PHC contaminated sites are often difficult to ... -
Removal of Enteric Viruses By Ultrafiltration Membranes
(University of Waterloo, 2011-08-29)Application of low pressure membranes in drinking water treatment, including both microfiltration (MF) and ultrafiltration (UF), have witnessed a rapid increase in the past decades. Low pressure membranes are considered a ... -
Removal of MS2 Bacteriophage, Cryptosporidium, Giardia and Turbidity by Pilot-Scale Multistage Slow Sand Filtration
(University of Waterloo, 2007-05-16)This research aimed to address the knowledge gaps in the literature regarding the removal of waterborne pathogens (viruses and protozoa) by modified multistage slow sand filtration. In the current study, two pilot-scale ... -
Removal of Organic Matter by Classical Biofiltration: Mechanistic Insights Regarding "Biodegradation"
(University of Waterloo, 2019-10-03)Pilot-scale biofiltration experiments were conducted at the Region of Waterloo’s Mannheim Drinking Water Treatment Plant to inform the scientific and operational understanding of drinking water treatment by biologically-active ... -
Removal of Perfluorinated Compounds from Ultrapure and Surface Waters by Adsorption and Ion Exchange
(University of Waterloo, 2015-02-02)Perfluorinated compounds (PFCs) have been detected globally in drinking water at trace concentrations. This is attributable to the chemical properties that characterize these compounds: strong saturated carbon-fluorine ... -
Removal of Perfluorinated Compounds in Drinking Water Treatment: A Study of Ion Exchange Resins and Magnetic Nanoparticles
(University of Waterloo, 2017-11-21)Perfluorinated compounds (PFCs) are emerging contaminants which have been detected in various environmental compartments, including drinking water sources. Because of their potential risks to human health, PFCs in drinking ... -
Renewal of Potable Water Systems Using Cement Mortar Lining; an Investigation into Corrosion Reduction and Water-loss Prevention
(University of Waterloo, 2007-01-23)Many Canadian cities are faced with the problem of an aging and deteriorating iron water distribution network - pipe breaks, leakage, and/or aesthetic water quality problems. Public confidence in municipalities’ ability ... -
Resilience assessment in geotechnical engineering
(University of Waterloo, 2016-09-15)Impacts of inevitable disasters and climate change have been major concerns for the safety and sustainability of communities in the recent past. In an effort to reduce these impacts, development of resilience in civil ...