Delineating karst groundwater flow paths by fluorescent dye tracing on Quadra Island, BC
De Laplante, Ghislain
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In the Fall of 2019 a dye trace was conducted at three sink points and four springs near Stramberg Farm, Quadra Island BC. The goal of the project was to delineate subsurface flow paths to better understand the recharge properties of each spring. Three fluorescent dyes: rhodamine WT, fluorescein and eosine were introduced at each sink point and activated charcoal sample packets installed at each suspected (spring) resurgence site. Using baseline data from background charcoal packets, the spectral results recorded the presence and concentration of each unique dye at the five springs suspected of being linked to injection sites. Additionally, daily water samples were taken after initial injection at Stramberg Farm. Sink points were chosen to supplement previous dye traces in the area, and springs were selected as the most likely discharge points.