Validity of Two-Point Method of Velocity Sampling

by Robert P. Apmann, (A.M.ASCE), Assoc. Prof. of Engrg. and Appl. Sci.; S.U.N.Y. at Buffalo, Buffalo, NY,

Serial Information: Journal of the Hydraulics Division, 1970, Vol. 96, Issue 10, Pg. 2171-2176

Document Type: Journal Paper


The two-point method is widely used and an accurate means of sampling the vertical velocity profile in a stream channel. Although a general mathematical proof of the applicability of this technique appears impossible, it is possible to determine the absolute limits of accuracy and to analyze certain other characteristics of the method. The analysis of the validity of this technique is shown herein.

Subject Headings: Stream channels | Velocity profile | Mathematics

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