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Experts clash over airborne EM and groundwater models; safe-yield estimates diverge
Summary
Presentations by academic and consulting experts at the GA workshop highlighted the value and limits of airborne electromagnetic (AEM) surveys and revealed competing groundwater-model outcomes: one team's work estimates long-term recharge near 7,860 acre-feet/year while a district model produces higher values (around 14,000'15,000 af/yr). Experts said any revised, higher estimate must be justified by demonstrably better model fit to observed data.
A technical portion of the Indian Wells Valley workshop centered on how airborne electromagnetic (AEM) data and groundwater models are being used to map subsurface clay and fault structures and to estimate sustainable inflow to the basin.
Dr. Ryan Smith, an associate professor at Colorado State University who independently reviewed the AEM ("Skym") dataset, explained how time-domain electromagnetic surveys infer electrical resistivity and why interpretation requires careful calibration to well logs and salinity data. "These electric fields then create their own magnetic fields... it looks like complete nonsense to someone who's never worked with these data," he said, describing inversions and rock-physics transforms that relate resistivity to lithology.
Smith and other consultants said AEM is particularly…
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