The casingDiameter stored in WellConstruction is used every time field staff purge a well before sampling. A 2-inch diameter casing holds much less water than a 4-inch casing of the same depth, so purge volume and time differ significantly. Sampling protocols for low-flow purging require knowing casingDiameter to calculate the casing volume accurately. Well completion reports and work plans submitted to regulators must include the casingDiameter alongside screenTopDepth and casingMaterial.
Technical section
Data model, API, and internals — visible to developers.