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As the population continues to grow and as water becomes more and more an issue of political and social importance, well-managed safe drinking water and water quality are pervasive needs across Earth and environment. We are developing new interdisciplinary science, technology and policy to address these urgent issues.


Recent Submissions

Now showing 1 - 20 of 196
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    Water Futures for the World We Want
    (University of Saskatchewan, 2019) Schuster Wallace, Corinne; Sandford, Robert William; Merrill, S
    Executive Summary Achievement of Goal 6 is central to the achievement of the Sustainable Development Agenda The global water cycle literally floods the earth on a seasonal basis. Global warming and subsequent climate change is affecting this seasonal redistribution as well as the form in which water falls from the sky – as rain, snow, or ice. The world is aware that water can increasingly be loved or loathed: it is critical for existence of life and central to our quality of life, while also being responsible for poor health and death from waterborne diseases. Its absence causes droughts, and too much in too short a time causes floods. Water is a cornerstone of economic growth, essential for energy production, and equally as important for ecosystems. More frequent extreme weather events associated with too much or too little water have become threat-multipliers that are undermining social, economic, and political stability In many instances, water security and climate stability can be seen as two sides of the same coin. Many of the impacts of climate disruption are, and will continue to be, expressed through effects on water. Water, and the ways in which it is used, vary significantly between countries Even in areas where it is abundant, degradation of water quality can ultimately mean that water resources are insufficient. Groundwater resources are particularly important and vulnerable. In many places in the world accelerating hydro-climatic changes are putting greater pressure on already deteriorating water quantity and quality. Climate change is not the only stressor on our water resources. Population growth, urbanization, land use changes including deforestation and degradation, changing diets, and expanding societal wealth also impact the quality and quantity of surface and groundwater resources. Canada is not a water secure country This is evidenced through recent catastrophic experiences with floods, drought, fires, and toxic algae blooms. The cost of floods and droughts for families, towns and cities, the insurance sector, businesses, agriculture, and ultimately the Federal Government, are skyrocketing. Moreover, Canadian lakes and rivers support diverse plant and animal habitats, forests, tourism, recreation, agriculture, transportation, and essential ecosystem services such as water purification. However, these are not easily valued and therefore not valued enough. Canada’s water availability is disproportionately spread over a vast country spanning multiple ecozones, of which some, like the Canadian prairies, are semi-arid Most fresh water drains to the north, while most people live in the south. The Canadian economy remains highly dependent on resource extraction, processing and transportation of oil and gas, ore, and pulp and paper, as well as intensive agriculture for crop and livestock production. All of these sectors are both heavily reliant on water availability, and have costs to the natural environment and our water resources that are not always fully recognized or completely mitigated. Climate change is exacerbating water insecurity in Canada Temperature increases in Canada are among the highest in the world. This warming is already having a substantial impact on Canada’s cold-dominated hydrological cycle. Hydrologic shifts, especially between snowmelt- and rainfall-driven streams and rivers and subsequent changes in peak water flows have consequences for agricultural productivity, hydropower generation, and floods and droughts. Weather events are becoming more extreme, traditional animal territories are changing, and pathogen ranges are expanding. Jurisdictional fragmentation, territoriality, and inequities make it difficult to generate and implement a common water management vision in Canada Portfolios such as agriculture, health, water and wastewater treatment are shared between multiple agencies and levels of government, and water itself flows across municipal, provincial, territorial, and sometimes national boundaries. Inequities also exist with respect to who experiences the impacts of these challenges and who is most vulnerable to them. Indigenous communities, women and girls, and natural ecosystems are being left behind in pursuit of economic progress. In the absence of a coherent vision of itself at its future sustainable best, Canada as a nation remains mired in divisiveness on matters of energy policy, resource development, and action on climate change. There is considerable opportunity for Canada to coordinate the activities of its water sector Through the example of good and responsible management of its waters, based on strong science and evidence, Canada can improve its own water management and play a prominent leadership role in meeting water-related targets of the Sustainable Development Agenda. Opportunities exist through leadership, example, and knowledge mobilization. Canada possesses a modern water industry, world-leading water technologies, professionally managed water service provision, and world-class transformative water research. The strengths of our water sector, however, have not been optimally harnessed and fully orchestrated for future national interest. Water cooperation, in particular, is poised to become a major instrument that can be used to prevent conflict while at the same time strengthening international stability and promoting peace. Major gaps still exist if we are to meet the ambitious yet necessary Goals of the 2030 Agenda Based on an analysis of reports, syntheses, and activities to date, previous recommendations, the SDG targets, and the challenges associated with meeting and measuring the SDGs nationally and internationally from a variety of sources, we offer recommendations for action in research, practice, and leadership. This report is intended as a blueprint for more coordination between research, policy, and practice between Canadian water researchers, the Canadian government, and other initiatives around the world that will intentionally fill the gaps identified as necessary to achieve a water future for the world we want. There are huge opportunities for Canada on the national and global stage in these areas. Given the right business model and access to support and resources, there is significant capacity within the Canadian water sector to deliver water technology, management, capacity, and predictive tools to emerging markets, particularly in developing countries, to accelerate greatly needed sustainable water resources management. There is an urgent need to ensure the sustainability of natural bio-diversity-based Earth system function Presently, there is a huge and growing gap between our understanding of the problems and implementation and practice. These gaps can be bridged by recognition of the link between water, peace, security, and human and planetary health and the SDGs can be a catalyst whereby we organize our intentions and our actions to get there. This report synthesizes current undertakings, gaps, and opportunities through research, practice, and leadership to shape sustainability starting with our water future. There is huge opportunity for university research and leadership to contribute to this water future Research networks should continue to remind all of the risks and threats posed to future stability by poverty, inequality, injustice, failed governance, climate change, and the massive involuntary human migration that are already beginning to follow in their collective wake. Ideally, however, universities should go beyond just talking about the SDGs and their importance, as they are largely doing now. They are uniquely poised to be showing the country and the world what the SDGs mean and how to implement them. The challenges, as always, lie in generating transformative and sustainable change that is more than the sum of individual programs, projects, and activities, even when they have scientific value in and of themselves. As such, a commitment to leadership is essential to realize these actions and to leverage them to become greater than the sum of their parts.
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    Transferrable Principles to Revolutionize Drinking Water Governance in First Nation Communities in Canada
    (MDPI, 2020) Irvine, Alison ; Schuster Wallace, Corinne; Dickson-Anderson, Sarah; Bharadwaj, Lalita
    There are analogous challenges when it comes to the management and provision of health services and drinking water in First Nations reserves in Canada; both represent human rights and both involve complex and multijurisdictional management. The purpose of this study is to translate the tenets of Jordan’s Principle, a child-first principle regarding health service provision, within the broader context of First Nation drinking water governance in order to identify avenues for positive change. This project involved secondary analysis of data from 53 semi-structured, key informant (KI) interviews across eight First Nation communities in western Canada. Data were coded according to the three principles of: provision of culturally inclusive management, safeguarding health, and substantive equity. Failure to incorporate Traditional Knowledge, water worldviews, and holistic health as well as challenges to technical management were identified as areas currently restricting successful drinking water management. Recommendations include improved infrastructure, increased resources (both financial and non-financial), in-community capacity building, and relationship building. To redress the inequities currently experienced by First Nations when it comes to management of and access to safe drinking water, equitable governance structures developed from the ground up and embedded in genuine relationships between First Nations and Canadian federal government agencies are required.
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    Water in the World We Want: Catalysing National Water-Related Sustainable Development
    (United Nations University Institute for Water, Environment and Health and United Nations Office for Sustainable Development, 2015) Schuster Wallace, Corinne; Sandford, R
    The international community is at an important juncture, as it is engaged in an intense debate on the future of the development agenda at the conclusion of the Millennium Development Goals in 2015. This worldwide dialogue takes place against a backdrop of poverty, increasing economic and social inequities, and global environmental changes. With failure no longer an option, we must build upon the lessons and successes of the Millennium Development Goals, recognise the importance of our environment for prosperity, and catalyse sustainable economic growth. While the post-2015 agenda will be defined at the global level its success, however, will be realized at national and subnational scales. Thus, in deliberations, attention must be paid to potential disconnects between what we must achieve as a global society and how these goals can be implemented effectively, efficiently, and in a timely manner on the ground. While this implementation has to accommodate national development priorities, a coordinated and integrated response must guide evidence-informed decision-making, trans-sectoral planning and policies, full cost accounting and economies of scope and scale. UNU-INWEH and UNOSD, together with our partners at the Global Water Partnership and McMaster University, have undertaken an analytical exercise to identify what implementation to achieve proposed Sustainable Development Goals (SDGs) will look like at the country level. This initiative directly builds upon a global assessment of the role of water in sustainable development that we concluded in 2013. Findings of this country-based study, combined with the underlying evidence are presented in this policy brief. Through a series of country case studies, expert opinion, and evidence synthesis, the report explores the critical role that water plays (including sanitation and wastewater management) in sustainable development; current disconnects between some national development plans and the proposed SDGs; opportunities for achieving sustainable development through careful water management; and, implementation opportunities. It is our anticipation that this report fills a critical gap in understanding the complexities associated with water resources and their management, and also provides substantive options that enable us to move forward within the global dialogue.
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    Women, WaSH, and the Water for Life Decade: An emerging framework for success post-2015
    (United Nations University Institute for Water, Environment and Health and the Women for Water Partnership, 2015) Schuster-Wallace, Corinne; Cave, Kate; Bouman-Dentener, Alice; Holle, Frederique
    Where women are given a voice, they are very strong advocates for the sustainable use, equitable provision and the importance of good quality water associated with sanitation and hygiene practices. Evidence shows that meaningful involvement of women in water resources development, management and use can lead to the design of effective new solutions to water problems, help governments avoid poor investments and expensive mistakes, make projects more sustainable, ensure that infrastructure development yields the maximum social and economic returns, and further development goals. Furthermore, being rooted in society, women’s civil society organisations, when properly empowered and facilitated, have the potential to engage their communities and create the commitment and local ownership that is needed to develop and upscale successful community interventions.
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    WaSH: Integrated Social Empowerment Toolkit for Community WaSH and Wellbeing - W:ISE Toolkit Handbook
    (United Nations University Institute for Water, Environment and Health (UNU-INWEH), 2015) Schuster Wallace, Corinne; Cave, Kate; McCormick, Haley; Watt, Susan; Dickson-Anderson, Sarah
    The purpose of this handbook is to describe tools and methods that a community, NGO, or local government can use to understand the relationship that community members have with each other and with water and their environment; to understand how these relationships impact health; how and why water is used in the community; how sanitation and hygiene practices are viewed; and how changes could be made. The toolkit described in this handbook can be used to provide insight into community water and health challenges as a first step to identifying and prioritising ways to improve WaSH and wellbeing within a framework of community values, traditions, and culture. There are two files; the larger one includes additional appendices.
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    A Review of Health Risks and Pathways for Exposure to Wastewater Use in Agriculture
    (National Institute of Environmental Health Sciences (NIEHS), 2016) Dickin, Sarah K; Schuster Wallace, Corinne; Qadir, Manzoor; Pizzacalla, Katherine
    Background: Wastewater is increasingly being used in the agricultural sector to cope with the depletion of freshwater resources as well as water stress linked to changing climate conditions. As wastewater irrigation expands, research focusing on the human health risks is critical because exposure to a range of contaminants must be weighed with the benefits to food security, nutrition and livelihoods. Objectives: The goal of this paper was to review research examining health risks and exposure pathways associated with wastewater irrigation to identify research trends and gaps. Methods: We conducted a review of the literature and identified a total of 126 studies published from 1995 to 2013. Findings were summarized based on several themes including types of exposure pathways, wastewater contaminants, methodological approaches and the geographical distribution of research. Results: Only 23 studies used epidemiological methods, while most research applied alternative methods to estimate risk, such as quantitative risk assessment models or comparisons of crop contamination to established guidelines for wastewater reuse. A geographic breakdown demonstrated a focus on microbiological contaminants in specific regions such as sub-Saharan Africa and Southeast Asia, despite growing chemical risks associated with rapid urbanization and industrialization that may change the types and distribution of wastewater contaminants. Conclusions: To provide a more comprehensive understanding of the health risks of wastewater use in agriculture, future research should consider multiple exposure routes, long-term health implications, and increase the range of contaminants studied, particularly in regions heavily dependent on wastewater irrigation.
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    The Virtual Water Gallery: Changing Attitudes through Art
    (European Geosciences Union, 2023) Arnal, Louise; Clark, Martyn P.; Dumanski, Stacey
    Water is life. Water-related challenges, such as droughts, floods, wildfires, water quality degradation, permafrost thaw and glacier melt, exacerbated by climate change, affect everyone. Yet, it is challenging to communicate science on difficult, highly volatile topics such as water and climate change. Conceptualizing water-related environmental and social issues in novel ways, with engagement between diverse audiences may lead to comprehensive solutions to these complex challenges. Art can be a catalyst in the co-creation of new knowledge for the benefit of society. The Virtual Water Gallery (VWG) is a transdisciplinary science and art project of the Global Water Futures (GWF) program. Launched in 2020, the VWG aims to provide a collaborative space for dialogues between water experts, artists, and the wider public, to explore water challenges. As part of this project, 13 artists representing women’s, men’s and Indigenous voices across Canada were paired with teams of GWF scientists to co-explore specific water challenges in various Canadian ecoregions and communities. These collaborations led to the co-creation of artworks exhibited online on the VWG ( in 2021. The VWG recently came to life in 2022 with an in-person exhibition in Canmore, Alberta, Canada. Surveys were developed to capture changes in perspectives regarding climate change and water challenges through this art-science exhibit. Participants of the VWG (artists and scientists), visitors to the online gallery, and visitors to the in-person exhibition in Canmore were all invited to take part in those surveys. The preliminary results from the surveys suggest that participants experienced changes in behaviour regarding water-related climate change mitigation, and that the degree of change depends on factors such as age, income and lived experience (i.e., floods and droughts). The results help elucidate how art viewers engage with art based on science and how science messages can be more effectively communicated through art.
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    Translating hydrology research into practice: A Canadian Perspective
    (European Geosciences Union, 2023) Pietroniro, Alain; Rokaya, Prabin; Schuster-Wallace, Corinne; Pomeroy, John
    Hydrology research is regarded as vital for advancing human development and environmental conservation through improved hydrological process understanding and by devising solutions to address water management challenges. This is particularly acute in a time of global change and the need to find pathways to water sustainability. Success for research in hydrology is often measured through quantitative research outputs, such as the number of journal publications, citation indices, number of students trained, patents, and external research funding. User involvement in the research and development process is rarely considered a metric for success in hydrology. Despite successful scientific or engineering advancements, a greater scientific understanding of hydrology and ever-increasing publications, much of the research has limited uptake by practitioners and implementation into practice, leading to a growing gap between research and practice. This lack of utilisation is not due to a lack of need by users, but rather is a symptom of the disconnect between these advances and research that would most add value to practitioners and their application needs. We explore some outstanding challenges in translating academic research into practice and make some recommendations to bridge the increasing gaps between research and practice through a transdisciplinary approach, user engagement metrics in funded research and strong knowledge mobilization. We also discuss the success and challenges of these approaches in the Global Water Futures program along with lessons learned.
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    Advances in mapping sub-canopy snow depth with unmanned aerial vehicles using structure from motion and lidar techniques
    (Copernicus Publications on behalf of the European Geosciences Union, 2019) Harder, Phillip; Pomeroy, John; Helgason, Warren D.
    Vegetation has a tremendous influence on snow processes and snowpack dynamics yet remote sensing techniques to resolve the spatial variability of sub-canopy snow depth are lacking. Unmanned Aerial Vehicles (UAV) have had recent widespread application to capture high resolution information on snow processes and are herein applied to the sub-canopy snow depth challenge. Previous demonstrations of snow depth mapping with UAV Structure from Motion (SfM) and airborne lidar have focussed on non-vegetated surfaces or reported large errors in the presence of vegetation. In contrast, UAV-lidar systems have high-density point clouds, measure returns from a wide range of scan angles, and so have a greater likelihood of successfully sensing the sub-canopy snow depth. The effectiveness of UAV-lidar and UAV-SfM in mapping snow depth in both open and forested terrain was tested in a 2019 field campaign in the Canadian Rockies Hydrological Observatory, Alberta and at Canadian Prairie sites near Saskatoon, Saskatchewan, Canada. Only UAV-lidar could successfully measure the sub-canopy snow surface with reliable sub-canopy point coverage, and consistent error metrics (RMSE <0.17m and bias -0.03m to -0.13m). Relative to UAV-lidar, UAV-SfM did not consistently sense the sub-canopy snow surface, the interpolation needed to account for point cloud gaps introduced interpolation artefacts, and error metrics demonstrate relatively large variability (RMSE <0.33m and bias 0.08 m to -0.14m). With the demonstration of sub-canopy snow depth mapping capabilities a number of early applications are presented to showcase the ability of UAV-lidar to effectively quantify the many multiscale snow processes defining snowpack dynamics in mountain and prairie environments.
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    Yukon River Basin Streamflow Forecasting System - Advancing, Calibrating, Demonstrating Snow Assimilation and Estimating Ungauged Basin Flow: The Vector-Based MESH Model of the Yukon River Basin
    (Centre for Hydrology, University Saskatchewan, Saskatoon, Saskatchewan, 2023) Elshamy, Mohamed; Pomeroy, John; Pietroniro, Alain
    The Yukon River Basin the second largest river in the Arctic region of North America and is shared between Canada and the US. The Canadian part covers almost half of the Yukon Territory in addition to a small portion of the province of British Columbia, while the US part falls totally within the state of Alaska. This study is concerned with Canadian part of the Yukon River with its outlet at Eagle, Alaska - just downstream of the international boundary (288,000 km2). The southern part of the Yukon River basin is characterized by extensive icefields and snowfields at high elevations (up to 4700 m above sea level) with steep slopes, and thus generates considerable runoff. There are also mountain ranges on the eastern and northern boundaries of the basin, while the western areas are milder in slope and partially forested. Snow redistribution by wind, snowmelt, glacier melt and frozen soil processes in winter and spring along with summertime rainfall-runoff and evapotranspiration processes are thus key to the simulation of streamflow in the basin. This supplement shows further development of a vector-based MESH setup for the Canadian portion of the Yukon River Basin down to Eagle, Alaska. For operational forecasting, MESH is driven by the Environment and Climate Change Canada Global Multiscale Model (GEM) weather model forecasts with precipitation replaced with the Canadian Precipitation Analysis (CaPA) which assimilates local precipitation observations where they exist, collectively referred to as GEM-CaPA. Additionally, the newly developed Regional Deterministic Reforecast System v2.1 (RDRS v2.1) forcing has been extended to span the period 1980-2018 enabling long-term assessments of hydrology. The revised vector-based model was calibrated for operational use based on the GEM-CaPA forcing dataset, and for performing historical simulations based on the RDRS v2.1 forcing dataset, using the period 2004-2011 in both cases. Performance was compared to the previously generated grid-based MESH model whose development was documented in Centre for Hydrology Report #16. A long-term historical simulation was then performed using RDRS v2.1 from which streamflow exceedance return periods for 15 important stations were calculated and presented in this supplement. Calibration has generally improved the performance of the vector-based setup compared to the previous simulations presented in supplement #1 of report #16. Parameter sets are slightly different when the model is calibrated to RDRS v2.1 compared to GEM-CaPA due to differences between the two datasets. A pilot study of the potential benefits of snow data assimilation into the existing MESH forecast system was conducted using historical data and the gridded MESH product that is used operationally by Yukon Environment. This test showed benefits to assimilating surface snowpack observations into MESH to correct winter precipitation. Outputs with assimilation showed improved snowpack simulations and improved streamflow forecasts.
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    Yukon River Basin Streamflow Forecasting System - Vector-Based MESH Model Setup for Yukon River Basin
    (Centre for Hydrology, University Saskatchewan, Saskatoon, Saskatchewan, 2022) Aygun, Okan; Elshamy, Mohamed; Pietroniro, Alain; Pomeroy, John
    The Yukon River Basin the second largest river in the Arctic region of North America and is shared between Canada and the US. The Canadian part covers almost half of the Yukon Territory in addition to a small portion of the province of British Columbia, while the US part falls totally within the state of Alaska. This study is concerned with Canadian part of the Yukon River with its outlet at Eagle, Alaska - just downstream of the international boundary (288,000 km2). The southern part of the Yukon River basin is characterized by extensive icefields and snowfields at high elevations (up to 4700 m above sea level) with steep slopes, and thus generates considerable runoff. There are also mountain ranges on the eastern and northern boundaries of the basin, while the western areas are milder in slope and partially forested. Snow redistribution by wind, snowmelt, glacier melt and frozen soil processes in winter and spring along with summertime rainfall-runoff and evapotranspiration processes are thus key to the simulation of streamflow in the basin. This supplement shows the development of a vector-based MESH setup for the Canadian portion of the Yukon River Basin at Eagle. Without additional calibration, the vector-based model performance was compared to the previously generated grid-based MESH model whose development was documented in Centre for Hydrology Report #16. MESH was driven by the Environment and Climate Change Canada Global Multiscale Model (GEM) weather model forecasts with precipitation replaced with the Canadian Precipitation Analysis (CaPA) which assimilates local precipitation observations where they exist, collectively referred to as GEM-CaPA. Additionally, the models were run, without additional calibration using the newly developed Regional Deterministic Reforecast System v2 (RDRS v2) forcing. RDRS v2 forcing is being extended as a hindcast by ECCC to approx. 1980 and so will permit 40 year runs of MESH from which streamflow exceedance return periods can be calculated. Model performance was slightly inferior for the vector-based setup compared to the original grid-based one. This may be due to the full calibration applied to the grid-based model and parameter transfer to the vector-based model without recalibration. Model performance also deteriorated when the RDRS v2 was used as forcing data, as the model was originally calibrated to GEM-CaPA. It is expected that model performance will improve once it is fully calibrated using the RDRS v2 forcing data.
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    Climate Change in Canadian Floodplain Mapping Assessments
    (Centre for Hydrology, University of Saskatchewan, Saskatoon, Saskatchewan, 2020) Rajulapati, Chandra Rupa; Tesemma, Zelalem; Shook, Kevin; Papalexiou, Simon Michael; Pomeroy, John W.
    In the recent decades, precipitation patterns and corresponding streamflow responses in many cold regions catchments have changed considerably due to warming. Understanding historical changes and predicting future responses are of great importance for planning and management of water resources systems. Regional climate simulations using convention- permitting models are helpful in representing the fine-scale cloud and mesoscale processes, which are critical for understanding the physical mechanisms that cause in convective precipitation. From a hydrological perspective, these fine resolution simulations are helpful in understanding the runoff generation mechanisms, particularly for mountainous watersheds, which have high spatial variation in precipitation due to large differences in elevation over small distances. The sister-study of this report, the Bow River Basin Study (BRBS), used a physically based hydrological land surface scheme along with a water management model, coupled with a high resolution convention- permitting atmospheric regional model (Weather Research and Forecasting, WRF) to understand the streamflow generating mechanisms and identify the changes in streamflow responses of the Bow and Elbow River Basins. The coupled model appears to provide a large improvement in predictability, with minimal calibration of parameters and without bias correction of forcing from the atmospheric model. The model4 was able to provide reliable estimates of streamflows, despite the complex topography in the catchment. Using the WRF Pseudo Global Warming (PGW) scenario, estimated future streamflows simulated were then used to develop projected flow exceedance curves. The uncertainty in the simulations is extremely helpful in the risk assessment for downstream flood inundations. However, the uncertainty in streamflows cannot be assessed as the WRF- PGW dataset was only available for a single realization, because of the high computational cost. The research presented in this report focusses instead on using the highly efficient hydrological model developed and verified in BRBS whilst assessing uncertainty using another regional climate model, the CanRCM4, where many realizations are available for different boundary conditions. Since the CanRCM4 simulations have a relatively low resolution, a novel methodology was developed to adjust regional climate model outputs using the WRF-PGW data. An ensemble of 15 CanRCM4 simulations was used to force the Bow River basin model to determine a measure of the uncertainty in the simulated streamflows, and the projected streamflow exceedance probability curves. These curves are extremely useful for risk assessment for downstream flood inundations. Given the importance of understanding how much extreme precipitation will change in urban areas of the basin, where short duration high intensity events cause flash flooding, frequency analysis of these events was carried out for Calgary and Intensity Duration Frequency (IDF) curves were developed. A ready-to-use empirical form of IDF curve has been proposed from this analysis for the City of Calgary. The results from the WRF-PGW modelling indicated that future high flow, low frequency (exceedances less than 10%) streamflow events will decrease compared to those under the current climate condition by 4, 9 and 1.6 m3/s for the Bow River at Banff and Calgary and Elbow River at Sarcee Bridge respectively. The average of the 15 new CanRCM4-WRF-PGW results supports the above result with some greater decreases in streamflow of 9, 16 and 4 m3/s for Bow River at Banff and Calgary and Elbow River at Sarcee Bridge respectively. However, there were some CanRCM4-WRF-PGW realisations that suggested substantial increases in future low frequency streamflow from those indicated by the average CanRCM4- WRF-PGW-drive MESH model. The below average, high frequency (exceedances greater than 30%) future streamflows will increase modestly in all gauging locations by from 1 to 12.5 m3/s. The results of the extreme precipitation analysis at Calgary indicated an increase in future extreme precipitation events of all duration and return periods. On an average an increase of 1.5 times is noted for short return periods (=2, 5), and an increase of 4 times for long return periods (=500, 1000).
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    Yukon River Basin Streamflow Forecasting System
    (Centre for Hydrology, University Saskatchewan, Saskatoon, Saskatchewan, 2020) Elshamy, Mohamed; Loukili, Youssef; Princz, Daniel; Richard, Dominique; Tesemma, Zelalem; Pomeroy, John W.
    The Yukon River Basin is one of the main rivers in the Arctic region of North America and is shared between Canada and the US. The Canadian part covers almost half of the Yukon Territory in addition to a small portion of the province of British Columbia, while the US part falls totally within the state of Alaska. This study is concerned with Canadian part of the Yukon River with its outlet at Eagle, just across the border in Alaska. Small parts of this catchment are in Alaska. This basin has an area of 288,000 km2, from 58.8 – 65.6°N and 129.2 – 134.1°W. The southern part of the basin is characterized by large glaciers at high elevations (up to 4700 m above sea level) with steep slopes, and thus generates considerable runoff. There are also mountain ranges on the eastern and northern boundaries of the basin, while the western areas are milder in slope and partially forested. Snow redistribution, snowmelt, glacier melt and frozen soil processes in winter and spring along with summertime rainfall-runoff and evapotranspiration processes are thus key to the simulation of streamflow in the basin. This project developed, set up, calibrated, validated, and operationalized a streamflow discharge forecasting system for the Yukon River and several of its tributary rivers within the Yukon Territory. The Yukon River Basin streamflow forecasting system is based around the MESH (Modélisation Environmentale Communautaire - Surface and Hydrology) hydrological land surface model. MESH is a state-of-the-art semi-distributed cold regions hydrological land surface model that models both the vertical exchanges of heat and moisture between the land surface and the atmosphere as well has the horizontal transfer of water to streams that is routed hydrologically to the outlet of the basin. It includes snow, frozen soil and glacier processes as well as the full suite of warm season hydrology. MESH is driven by the Environment and Climate Change Canada GEM weather model and hindcasts are driven by GEM-CaPA which is a data assimilation product that uses local precipitation observations where they exist. The rivers forecasted includes the Yukon River Basin upstream of Eagle, AK and the Porcupine River Basin near the international boundary. MESH provides supplemental high resolution simulations and forecasts for the Klondike, Stewart, Pelly and White Rivers at their mouths. Daily river discharge and water balance forecasts are produced by the system for each river basin. Having MESH run at both 10 km and 5 km resolution provides an assessment of model resolution needed for forecasting and also of model uncertainty in the forecasts. The MESH model was driven by GEM-CaPA for hindcasts and with the GEM ECCC Regional and Global Deterministic Prediction Systems - RDPS and GDPS forecasts for forecasts of 2 and 9 days. The GEM-MESH model showed good to very good predictions in most river basins after calibration and parameter selection, with challenges for the Porcupine and White rivers due to permafrost and wetlands (Porcupine) and to extensive icefields (White) and overall to sparse to non-existent observed precipitation data to assimilate into the CaPA system. The forecast system is capable of providing reliable streamflow predictions and is run with automated scripts on Amazon Web Services. Future development of the forecasting system should focus on the very challenging permafrost hydrology of the Porcupine River Basin, and the glacier hydrology of the White River which drains the largest icefields in North America. The model does not include a river ice component, but one could be added in the future.
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    Diagnosis of Historical and Future Flow Regimes of the Bow River at Calgary Using a Dynamically Downscaled Climate Model and a Physically Based Land Surface Hydrological Model : Final Report
    (Centre for Hydrology, University of Saskatchewan, Saskatoon, Saskatchewan, 2020) Tesemma, Zelalem; Shook, Kevin; Princz, Daniel; Razavi, Saman; Davison, Bruce; Li, Yanping; Pietroniro, Alain; Pomeroy, John W.; wheater, howard
    This report assesses the impacts of projected climate change on the hydrology, including the flood frequencies, of the Bow and Elbow Rivers above Calgary, Alberta. It reports on investigations of the effects of projected climate change on the runoff mechanisms for the Bow and Elbow River basins, which are important mountain headwaters in Alberta, Canada. The study developed a methodology and applied a case study for incorporating climate change into flood frequency estimates that can be applied to a variety of river basins across Canada.
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    The Changing Hydrology of Lhù’ààn Mǟn - Kluane Lake - under Past and Future Climates and Glacial Retreat
    (Centre for Hydrology, University of Saskatchewan, Saskatoon, Saskatchewan, 2018) Loukili, Youssef; Pomeroy, John W.
    The goal of this report is to estimate the variability and changes in the lake levels of Kluane Lake over the historical period and into the future climates of the 21st C, with and without the Kaskawulsh Glacier contribution. The study diagnoses the causes of variability of lake levels in the past and evaluates the impact of deglaciation on lake levels in the future in the context of climate change. The methods use a combination of weather data from observations and global climate models to drive a detailed glacio-hydrological prediction model, which calculates streamflows in the Slims River and other inflows to Kluane Lake, lake evaporation and outflows and then the lake level. Historical Kluane Lake levels during the 20th C and future lake levels under global warming projections for the rest of the 21st C were predicted - with and without the Kaskawulsh Glacier contribution to the Slims River. The Canadian glacio-hydrological water prediction model MESH, which couples the Canadian Land Surface Scheme with both surface and subsurface runoff on slopes and river routing, was used to model the hydrology of the Kluane Lake Basin for these predictions. The adjacent gauged Duke River Basin was also included in the model to provide opportunities to evaluate the model performance in this region against gauged streamflows. Model parameterisations of topography, land cover, glacier cover, soil type and runoff directions were made and used to set up the model on various sub-basins flowing into Kluane Lake, including the Slims River Basin. The results drawn from this study are intended to answer important questions posed by Kluane First Nation of Burwash Landing, residents of Destruction Bay and surrounding areas and Yukon Government on the history and the future of Kluane Lake levels. Furthermore, the study will help inform water management and infrastructure design around Kluane Lake, and other environmental and aquatic conservation and adaptation efforts in the region. While the models employed here represent the “state-of-the-art”, there is uncertainty in the predictions. This uncertainty could be reduced in future prediction efforts by resuming Kluane River discharge measurements, which were discontinued in 1994.
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    Improving and Testing the Prairie Hydrological Model at Smith Creek Research Basin
    (Centre for Hydrology, University of Saskatchewan, Saskatoon, Saskatchewan, 2014) Pomeroy, John W.; Shook, Kevin; Fang, Xing; Dumanski, Stacey; Westbrook, Cherie; Brown, Tom
    The 2010 Prairie Hydrological Model configuration of the Cold Regions Hydrological Model was developed to include improved snowmelt and evaporation physics and a hysteretic relationship between wetland storage and runoff contributing area. The revised model was used to simulate the snow regimes on and the streamflow runoff from the five sub-basins and main basin of Smith Creek, Saskatchewan for six years (2007-2013) with good performance when compared to field observations. Smith Creek measured streamflows over this period included the highest annual flow volume on record (2011) and high flows from heavy summer rains in 2012. Smith Creek basin has undergone substantial drainage from 1958 when it contained 96 km2 of wetlands covering 24% of the basin area to the existing (2008 measurement) 43 km2 covering 11% of the basin. The Prairie Hydrological Model was run over the 2007-2013 period for various wetland extent scenarios that included the 1958 historical maximum, measured extents in 2000 and 2008, a minimum extent that excluded drainage of conservation lands and an extreme minimum extent involving complete drainage of all wetlands in Smith Creek basin. Overall, Smith Creek total flow volumes over six years increase 55% due to drainage of wetlands from the current (2008) state, and decrease 26% with restoration to the 1958 state. This sensitivity in flow volume to wetland change is crucially important for the water balance of downstream water bodies such as Lake Winnipeg. Whilst the greatest proportional impacts on the peak daily flows are for dry years, substantial impacts on the peak daily discharge of record (2011) from wetland drainage (+78%) or restoration (-32%) are notable and important for infrastructure in and downstream of Smith Creek. For the flood of record (2011), the annual flow volume and the peak daily discharge are estimated to increase from 57,317 to 81,227 dam3 and from 19.5 to 27.5 m3 /s, respectively, due to wetland drainage that has already occurred in Smith Creek. Although Smith Creek is already heavily drained and its streamflows have been impacted, the annual flow volumes and peak daily discharge for the flood of record can still be strongly increased by complete drainage from the 2008 wetland state, rising to 103,669 dam3 and 49 m3 /s respectively. This model simulation exercise shows that wetland drainage can increase annual and peak daily flows substantially, and that notable increases to estimates of the annual volume and peak daily flow of the flood of record have derived from wetland drainage and will proceed with further wetland drainage.
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    Development of a Snowmelt Runoff Model for the Lower Smoky River
    (Centre for Hydrology, University of Saskatchewan, Saskatoon, Saskatchewan, 2013) Pomeroy, John W.; Shook, Kevin; Fang, Xing; Brown, Tom; Marsh, Christopher
    The Smoky River tributary of the Peace River has an ungauged (in real-time) basin area of 23,769 km2, corresponding to 46% of its basin area of 51,839 km2 . The purpose of this study was to develop a model to simulate the daily spring ungauged flows of the Smoky River and its main tributary, the Little Smoky River for recent periods using measured meteorological data and forecast periods using the outputs of a numerical weather forecast model. A physically-based model of the ungauged local flows contributing to the Smoky River at Watino and the Little Smoky River at Guy, the Lower Smoky River Model (LSRM), was developed using the CRHM platform. The model was deployed to 26 ungauged sub-basins, from which discharges were routed and accumulated to produce the ungauged discharges at Guy and Watino. The LSRM modelled discharge was evaluated to estimate the discharge of the Smoky River and Little Smoky River in an operational setting with measured meteorological observations. Results from this comparison were very good with a high degree of hydrograph predictability, small bias in flow estimation, and very good prediction of peak daily discharge and excellent prediction of the timing of peak daily discharge. The results were somewhat better for the Smoky River than for the Little Smoky River, showing the effect of increasing basin size in compensating for inadequate precipitation observation density and/or errors in model structure or parameterization. The model has not yet been tested in an operational setting during a spring snowmelt event and its full capabilities and usefulness cannot be assessed until it has been tested in such a setting.
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    Implementing a parsimonious variable contributing area algorithm for the prairie pothole region in the HYPE modelling framework
    (Environmental Modelling and Software, 2023-09) Ahmed, Mohamed Ismaiel; Shook, Kevin; Pietroniro, Alain; Stadnyk, Tricia; Pomeroy, John W.; Pers, Charlotta; Gustafsson, David
    The North American prairie region is known for its poorly defined drainage system with numerous surface depressions that lead to variable contributing areas for streamflow generation. Current approaches of representing surface depressions are either simplistic or computationally demanding. In this study, a variable contributing area algorithm is implemented in the HYdrological Predictions for the Environment (HYPE) model and evaluated in the Canadian prairies. HYPE's local lake module is replaced with a Hysteretic Depressional Storage (HDS) algorithm to estimate the variable contributing fractions of subbasins. The modified model shows significant improvements in simulating the streamflows of two prairie basins in Saskatchewan, Canada. The modified model can replicate the hysteretic relationships between the water volume and contributing area of the basins. With the inclusion of the HDS algorithm in HYPE, the global HYPE modelling community can now simulate an important hydrological phenomenon, previously unavailable in the model.
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    Crop water use efficiency from eddy covariance methods in cold
    (Agricultural and Forest Meteorology, 2023-08) Harder, Phillip; Helgason, Warren; Johnson, Bruce; Pomeroy, John
    Crop–water interactions define productivity in water-limited dryland agricultural production systems in cold regions. Despite the agronomic and economic importance of this relationship there are challenges in quantifying crop water use efficiency (WUE). To understand dynamics driving crop water use and agricultural productivity in these environments, observations of evapotranspiration, carbon assimilation, meteorology, and crop growth were collected over 17 site-years at 5 agricultural sites in the sub-humid continental Canadian Prairies. Eddy-covariance (EC) derived water and carbon fluxes provided a means to comprehensively assess the WUE of current agricultural practices by both physiological (WUEP: g C kg−1 H2O) and agronomic (WUEY): kg yield mm H2O−1 hectare−1) approaches. Mean field scale WUEY for grain yields were 10.4 (Barley), 10.2 (Wheat), 6.0 (Canola), 19.3 (Peas), 12.2 (Lentils) and for silage/forage crops were 23.0 (Barley), 11.9 (Forage), and 20.7 (Corn) (kg yield mm H2O−1 hectare−1). An assessment of environmental factors and their covariance with WUE, utilising a conditional inference tree approach, demonstrated that WUE decreased when crops were under greater evapotranspiration demands. EC-based areal WUE approaches, measuring fluxes over footprints of hundreds of square metres, were compared with more commonly reported point-scale water balance residual approaches (WUEWB) and demonstrated consistently smaller magnitudes. WUEWB was greater than EC-estimated WUEY by an average of 52% and 65% for grain and forage/silage crops respectively. WUEWB also had greater variability than EC estimates, with standard deviations 188% and 128% greater than Barley and Wheat crops, respectively. This comparison highlights the scale dependency of WUE estimation methods, demonstrates considerable uncertainty in point scale water balance approaches due to spatial variability in crop–water interactions, and shows how this variability can be accounted for by EC observations. This improves the understanding of WUE and quantifies its variability in cold continental water-limited climates and provides a means to diagnose improved agricultural water management.
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    Informing the Vermilion River Watershed Plan through Application of the Cold Regions Hydrological Model Platform
    (Centre for Hydrology, University of Saskatchewan, Saskatoon, Saskatchewan, 2012) Pomeroy, John W.; Fang, Xing; Shook, Kevin; Westbrook, Cherie; Brown, Tom
    The Vermilion River Basin has been identified as one of most altered basins in the North Saskatchewan River Basin by the North Saskatchewan Watershed Alliance. Of all the basin altering activities, wetland drainage is thought to be the most important one in impacting watershed hydrology. The Cold Regions Hydrological Model (CRHM) has had recent developments that make it particularly appropriate to evaluate the impacts of Canadian Prairie wetlands on hydrology. In light of the importance of wetlands in the Vermilion River Basin and the capability of CRHM, this study had five objectives: 1) Setup CRHM for the Vermilion River Basin and conduct preliminary tests using local meteorological data. 2) Develop an improved wetland module that incorporates the dynamics of drained wetland complexes in the physically based, modular Prairie Hydrological Model of CRHM. 3) Refine CRHM results using advances in the improved wetland module, additional parameter data and other adjustments as necessary. 4) Demonstrate scenarios/sensitivity of landscape components such as wetlands and uplands to support planning decisions and make recommendations for land and watershed management. 5) Apply CRHM results to fortify recommendations and support decision making during initial plan implementation. The objectives were addressed with the following methodology. Existing data on precipitation, hydrometeorology, wetland characteristics, stage and extent, drainage pattern and land cover in the Vermilion River Basin were compiled. The existing CRHM Prairie Hydrological Model formulation was set up on the basin and test runs conducted and compared to streamflow hydrographs over multiple years. Then, improvements to the Prairie Hydrological Model formulation of CRHM were made so that CRHM could simulate sequences of many wetlands of varying sizes. The improved model was evaluated through hydrological simulation and quantitative analysis of streamflow and then used in sensitivity analysis of the effect of changing wetland drainage/restoration on streamflow for the Vermilion River. The model was then used to evaluate wetland manipulation and climate scenarios to fortify recommendations, explore options and support decision making for the implementation of the Vermilion watershed plan. The streamflow response of the Vermilion River Basin at its mouth was found to be dominated by channel hydraulics and the control structures in the lower basin and so it is influenced by wetlands only to the extent that the management regime of these control structures is affected by upstream hydrological behaviour of the tributaries with respect to volume and timing of streamflow inputs to the structures. Changes in the upper basin streamflows are more likely to be controlled by changes in the basin hydrological processes rather than in-stream water management and/or channel modifications and therefore the upper basin streamflows are more likely to show the effects of the manipulation of wetland storage.