It would be impressive to raise the wellhead pressure of a hot-water geothermal borehole to the maximum sustainable by flow and from this deduce the supply water temperature, rate of discharge, dryness fraction and density of the wellhead fluid. All this data can, in fact, be obtained from the reading of the pressure gauge installed below the wellhead control valve so long as the flow condition is that given above. The tentative results can be valuable for untested wells drilled in isolated areas; and for monitoring production wells as it permits estimates to be made of changing subterranean conditions.

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