Low‐Velocity Measurement in Water

Christopher Ellis, Heinz G. Stefan

Research output: Contribution to journalArticlepeer-review

5 Scopus citations


Water velocities in the centimeter per second range or less are measurable by only a few instruments. Experimental laboratory studies frequently require such measurements. A review of low water velocity measurement methods is presented. An inexpensive optical hydrogen bubble‐tracing technique is described for velocity measurements in the range 0.5 to 8 cm/s. Modification to a thymol blue (pH) tracer method extends its applicability to the range 0.1 to 1.0 cm/s. Design and operational characteristics of the hydrogen bubble/thymol blue current meter are described.

Original languageEnglish (US)
Pages (from-to)1480-1486
Number of pages7
JournalWater Resources Research
Issue number10
StatePublished - Sep 1986


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