depthToWaterFt on a FieldMeasurement is the raw measurement taken with a water-level meter or pressure transducer — the distance from a fixed reference point (top of casing) down to the water surface. This value is used alongside the well's surveyed casing elevation to calculate waterLevelElevationFt. The depthToWaterFt time series across multiple FieldMeasurements drives the water-level trend charts required in most regulatory groundwater monitoring reports.
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Depth to Water (ft)
`depthToWaterFt` on a FieldMeasurement is the primary field water-level measurement, recorded in feet from the top of the well casing to the water surface.