Supplementary material to "Hotspots and hot moments of metal mobilization: dynamic connectivity in legacy mine waters"

Hydrological data collection and analysis.Water level loggers (Levelogger 5, Solinst Canada Ltd.) were installed at sites 1, 2, 3A, and 3B, where the water level and flow could be continuously monitored and quantified.The water level loggers at levels 1 and 2 recorded measurements from March 2022 to approximately January 2024 and the loggers at levels 3A and 3B recorded measurements from February 2022 to March 2024.The "Levelogger Software 4.6.2"was used to retrieve the recorded data.For precise measurement of water levels and flow at the outflow points of sites 1 and 2, plastic weirs were constructed and installed.Conversely, sites 3A and 3B were equipped with small spillways instead of weirs.The measurements obtained were critical for establishing the relationships between water levels and discharge rates.From Henderson (1996), the formula for triangular measuring weirs was used: