Has anyone run heat‑pulse flowmeters in 6‑inch PVC monitoring wells to quantify ambient vertical flow and hydraulic connectivity between layers? I’m working this fall in a semi‑confined alluvial–basalt system near Boise (30–80 m wells; seasonal head swing about 0.4–0.6 m) and I’m weighing heat‑pulse vs electromagnetic units, plus whether to pair with short‑interval packers and DTS/heat‑as‑tracer, to resolve cross‑formational leakage and set sustainable pumping limits that won’t rob stream baseflow. Would appreciate real‑world thresholds on detectable velocities/flow (e.g., <0.2 L/min), drift issues, and workflows that fed cleanly into MODFLOW 6 layer budgets.