Baseline geographic information on wildfire-watershed risk in Canada: Needs, gaps, and opportunities

Abstract

As the pressures on water supply from shifting forest disturbance regimes continue to escalate, researchers are being asked to answer increasingly complex questions. However, many questions in wildfire-watershed risk (WWR) research remained unaddressed due to a paucity of relevant datasets. There are, indeed, many fundamental processes we do not understand that require additional data collection to develop risk management frameworks. As such, WWR researchers and managers face a paradox in their need to address critical questions important for the sustainability of socio-hydrological systems while dealing with incomplete information. In many cases, this leads to valuable research ideas being discarded on the account of limited data availability. However, imperfect, incomplete, or limited data should not deter researchers and managers from performing analyses to assess risk. In fact, such analyses improve the research benefit-to-cost ratio of existing data, help unravel gaps in data sources, enable generation of new hypotheses, and highlight where data availability and openness can be improved. If we do not use what we have, how can we know what we need? This issue is of particular interest in Canada, where baseline WWR information for the entire country is generally missing, despite growing concerns about water security in the face of a shifting wildfire regimes. In this commentary, we (a) identify several relevant open geospatial datasets, (b) illustrate how these datasets can be leveraged to produce simple yet relevant risk information, (c) identify some high priority data gaps that require immediate attention, and (d) discuss future avenues towards the creation of baseline Pan-Canadian WWR information.

A review of wildfire impacts on stream temperature and turbidity across scales

“…The changes in fire regime and behavior also influence hydrological processes heavily in forested watersheds that sustain the drinking water supply (Bladon and Parisien, 2021; García-Comendador et al, 2017; Hallema et al, 2017; Harrison et al, 2014). Wildfire behavior and impact on water quality is spatially and temporally complex, and vast assumptions have been made in previous research to generalize findings into mostly negative.…”