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The authors are thankful to Bijankhan and Ferro for their discussion. We should point out that the original paper was an attempt to have a preliminary look at the surface hydraulic jumps. The depth y 1 in the original paper is indeed the perpendicular depth of the stream or jet just before the jump and it is not the vertical depth as shown in Fig. 3, the definition sketch, which is an unfortunate error. The angle of this stream with the horizontal varied from about 10°to 30°. The reason we used only one height for the weir in the experiments is because Wu and Rajaratnam (1996) have shown that the submerged flow regimes are not affected by the height of the weir over a wide range. It is interesting to find that the results of the discussers on the relative energy loss are at least approximately described by the empirical equation proposed in the original paper.References Wu, S., and N. Rajaratnam. 1996. "Submerged flow regimes of rectangular sharp-crested weirs." J. Hydraul. Eng. 122 (7): 412-414. https://doi.org /10.1061/(ASCE) 0733-9429(1996)122:7(412).© ASCE 07020002-1 J. Irrig. Drain. Eng.

Pre-oxidation was introduced to improve the resistance of electroplated pure, 5 mm CeO 2 -dispersed, and 9-15 nm CeO 2 -dispersed Ni 3 Al coatings to coke formation and metal dusting in 24.4%CO-73.3%H 2 -2.3%H 2 O at 650 8C. Coke formation and metal dusting of pre-oxidized Ni 3 Al-based coatings were retarded up to 200 h owing to a thin Al 2 O 3 scale induced during preoxidation. The long-term effectiveness of pre-oxidation nonetheless depended on the integrity of Al 2 O 3 scale. The pure Ni 3 Al coating suffered severe spallation after pre-oxidation and thereby showed the worst long-term resistance. Two pre-treated 9-15 nm CeO 2 -dispersed Ni 3 Al coatings exhibited the best long-term resistance to carbon attack because nano-CeO 2 particles maintained a full coverage of Al 2 O 3 scale on the coatings. Two 5 mm CeO 2 -dispersed Ni 3 Al coatings showed significant spallation after pre-oxidation because of an overdoping effect and experienced coke formation and metal dusting during long-term exposure.