For example:
The phreatic surface is encountered at 15 feet depth.
or
The phreatic surface is encountered at a depth of 15 feet.
The first sentence seems to be easier to read.
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1Typically "depth of 15 feet" or "15 feet deep"—"15 feet depth" is understandable, but not necessarily a typical phrasing. – Emily Chapman Oct 14 '22 at 19:20
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1@EmilyChapman That's because measuring units used attributively must be singular in English, which is why anything but a fifteen-foot* depth* in ungrammatical. – tchrist Oct 14 '22 at 23:34
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Or at fifteen feet of depth. – Jim Oct 15 '22 at 05:17