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Rajaratnam, N., C. Katopodis and N. McQuitty (1990). Hydraulics of culvert fishways 2: Slotted-weir culvert fishways: Reply. Canadian Journal of Civil Engineering. 17:671-672.
We appreciate Hansen's interest in our paper and thank him for his comments and for subjecting some of our data to a rigorous statistical analysis. Hansen's analysis has successfully reproduced our equations for designs 1 and 5. We would like to point out that for turbulent free surface flows over roughness elements of the type encountered in culvert fishways (discussed in the paper), the depth measurements are necessarily approximate and subjecting these approximate depths to a very refined analysis is perhaps not warranted. We established the flow parameters Q sub(*) and y sub(0)/D not from purely data correlation but from sound fluid mechanics. Having established a functional relationship between these (compound) parameters, we wanted to evaluate this function for the different designs. The simple power law relations were developed primarily by plotting the data on double-log sheets and fitting a line by judgement, giving more weight to regions of more importance. Hence we see no problem with inverting these equations.
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