BS 3680-6:1995 Measurement of liquid flow in open channels - Part 6. Guide to measurement of flow in tidal channels
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This Part of BS 3680 gives guidance on a selection of recommended methods available for the measurement of liquid flow in tidal channels, special consideration being given to those techniques that are either unique to or particularly appropriate for measurement under tidal conditions. Reference is also made, where appropriate, to methods developed for measurement in non-tidal channels but in such cases attention is drawn to their limitations with respect to practicality and/or accuracy.
For various reasons direct measurements of velocity in tidal channels are more liable to large errors than are those made, for example, under conditions of uni-directional flow. Tidal flow measurement can be an instantaneous rate of flow or a total volume of flow during a flood or ebb tide. Attention is drawn to the cubature method for measuring volume of flow. Alternative methods such as weirs, flumes, dilution gauging, salt velocity and floats have not been included in this Part but may be suitable under certain conditions, especially where the effect of tides only impedes and does not stop or reverse the passage of stream flow. These methods are described in detail in other British Standards.
This Part covers two types of techniques:
a) techniques for single measurements of tidal flow; and
b) techniques appropriate for continuous measurement of tidal flow.
An important feature of this British Standard is clause 9 which deals with uncertainties in tidal flow
measurement both in the direct measurement and in methods of measurement by cubature.
Annexes are included to describe tidal theory and to illustrate velocity measurements of a tidal river.
