Abstract
ABSTRACT * N attempt to calibrate a sub-A merged water jet apparatus against critical tractive forces visually assessed in a flume is described. Although not completely successful the work indicated that the water jet might be suitable for routine laboratory measurement of critical tractive force, and suggestions are made for the improvement of the calibration. It is pointed out that the gradient of the erosion rate vs. shear stress curve may be important in channel design, as well as the critical tractive force. The conclusion is drawn that accelerated laboratory tests cannot be used to assess critical tractive forces.
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