Polluted surface waters that infiltrate into adjacent aquifers can impair groundwater quality. Contaminated groundwater discharging into streams, lakes, wetlands or the ocean can compromise their water quality. Indeed, various types of groundwater-surface water interactions and related processes can spread pollution across such boundaries or even remedy it. And we want to hear all about it, and the factors affecting it, from both sides of the groundwater-surface water interface (hydrogeology – hydrology disciplines), in this joint CGU/IAH-CNC session. Pollutant sources can encompass anthropogenic contaminants or be natural in origin (nutrients, metals, salts, etc.) where human activity has thrown things out of balance, and include legacy or emerging contaminants. Impacts on drinking water supplies and on ecosystems (aquatic or terrestrial), and attenuation processes active within the transition zone (between groundwater and surface water) are especially of interest. Studies on assessing the challenges and mechanisms to actively managing or remediating these pollutants (using gw-sw interaction related approaches) are most welcome.

• 10:30 am – 10:45 am | Fast, intermediate, and slow pathways for chloride transport to streams – Joel Moore
• 10:45 am – 11:00 am | An evaluation of stormwater management (infiltration vs runoff) considering water quality impacts from road salt to surface waters – Grant Hodgins
• 11:00 am – 11:15 am | A multi-scale framework to quantify groundwater contributions to chloride loads in the Credit River watershed – Ceilidh Mackie
• 11:15 am – 11:30 am | The future of freshwater salinization: predicting stream chloride response to urban growth, climate change, legacy salts, and watershed management in an urban watershed – Bhaswati Mazumder
• 11:30 am – 11:45 am | Towards a better understanding of recharge and discharge processes and their implications in the lower Grand River watershed, southern Ontario - Hafsa Momin
• 11:45 am – 12:00 pm | Rapid changes in subarctic stream chemistry associated with permafrost thaw and sulfide mineral oxidation – Sean Carey