Research > Land Water Management and Environmental Change

Research Theme - Land-Water Management and Environmental Change

Activities on land will ultimately have an impact on water, and there is a need for increased knowledge on issues such as how agriculture management practices (wetland drainage, tillage and irrigation) and urban water management affect water quality and water movement through a watershed.

Land-Water Management and Environmental Change working groups are collaborating on research into:

Effects of agricultural management on hydrological function, discharges and connectivity to the river system.
Impacts of agricultural and urban water management, including nutrients, pathogens and pharmaceutical products on water quality.
Lake biogeochemical processes, including ecosystem sensitivity to climate variability and pollutant stress
Development of feasible policy interventions and associated lake water quality and ecosystem responses

Theme Objectives:

Improve agriculture land-water management by understanding the effects of multiple stressors on water quantity and quality in watersheds
Develop water quality modelling tools by understanding the interaction between the hydrology, water quality and aquatic ecology of research sites
Develop new decision support tools for management and remediation of diffuse pollution, including mitigating impacts on aquatic ecosystem health

Working Group Membership:

Howard Wheater, Andrew Ireson, Charles Maule, Cherie Westbrook, Dan Pennock, Dave Janz, Fran Walley, Garth van der Kamp, Gordon Putz, Jeff Hudson, Jeff Schoenau, Jeff Sereda, John Giesy, John Pomeroy, Ken van Rees, Lalita Bharadwaj, Markus Hecker, Marley Waiser, Monique Dube, Paul Jones, Steven Siciliano

Theme Sub-Groups*:

Lake Diefenbaker
Smith Creek
Exotic Chemicals
St. Denis National Wildlife Area
Swift Current Creek
City of Saskatoon
Modelling
* Due to the need to take into account a watershed’s susceptibility and response to climate change when examining the interaction between hydrology, water quality and aquatic ecology of a site, many subgroups participate in both Climate Change and Water Security and Land-Water Management and Environmental Change research themes.

Research Spotlight on Lake Diefenbaker

Lake Diefenbaker is a major storage reservoir on the South Saskatchewan River and the province’s single most important water reserve, providing drinking water for more than 65 per cent of the province’s population. It also supplies almost all irrigation water in the province, some flood control and is a highly valued recreational asset for the more than 40 communities that line its 800 km of shoreline.

Inflows to the lake have dropped over 40 per cent since the early 1900s due to increased upstream consumption and reduced natural flows from the river’s Rocky Mountain headwaters. There are concerns about increased eutrophication of the lake under current conditions, which can be worsened by pollution from agricultural drainage waters and treated sewage effluents from upstream town and cities. However, historical research data from Lake Diefenbaker is limited, making it difficult to understand the frequency of algal blooms and what is causing them. In addition, the South Saskatchewan River has been identified as Canada’s most threatened river and is susceptible to climate change.

Global Institute for Water Security research groups are reconstructing and interpreting the past nutrient status of Lake Diefenbaker and identifying and prioritizing man-made contaminants in the South Saskatchewan River system. In addition, they will be identifying sources and management practices that are resulting in nutrient contamination of the river system. Research began in spring 2011.