Fig. 2: Precipitation and streamflow data collected over the study period.
a Time series of 15-minute binned precipitation and δ18O from precipitation and streamflow samples during storms. Stream and precipitation samples from 10 March 2021, 14 December 2021, and 28 March 2022 are similar in isotopic composition, indicating that runoff during that event was likely generated in large part from overland flow. 15 March 2021 stream samples in both catchments and 23-24 December 2021 stream samples in the unburned catchment show a distinct signature from co-temporal precipitation. b Total precipitation record in 15-min binned intervals (grey bars) and cumulative precipitation (blue line) for the two water years with timing of ERI surveys (red lines). Approximate periods of streamflow are indicated by green and orange bars based on trail camera and field observations. Extended baseflow occurred in the burned catchment after the large storms in December 2021. c 30-min Fnew values for 14 and 23 December 2021 showing different streamflow responses. The 14 December 2021 stream response shows fluctuating amounts of new water in streamflow, whereas 23 December 2021 shows a lower fraction new water, especially in the burned catchment, indicating higher groundwater contributions.
