Errata for “Flow-Boundary Effects on Critical Submergence of Intake Pipe” by Nevzat Yıldırım, Fikret Kocabaş, and Salih Cem Gülcan

Eq. (16) on page 291 should read aswhere FHG, $S_1{Z}_1{B}_1$ , $S_2{Z}_2{B}_2$ , $S_3{Z}_3{B}_3$ , and $S_4{Z}_4{B}_4$ are the common corner blockages of flow boundaries (spherical wedge surfaces) and $S_c=\mathrm{critical}$ submergence for the intake. If the conditions in Eq. (16) are not present, then FHG, $S_1{Z}_1{B}_1$ , $S_2{Z}_2{B}_2$ , $S_3{Z}_3{B}_3$ , and $S_4{Z}_4{B}_4$ are evaluated with an available computer-aided method or a graphical method. Or preferably, one can compute $A_c$ from continuity Eq. (1) on page 288 of the paper. Then, by means of a computer-aided method or a graphical method and a trial-and-error procedure, one can find $S_c$ (select $S_c$ until $A_c$ is satisfied).

For most of the experiments in the paper, since $S_c$ is always smaller than the radial distances of the intersection-corners of side walls, dead-end wall, and the canal bottom to the center point of the CSSS (or intake), $JH=K_1{Z}_1=K_2{Z}_2=K_3{Z}_3=K_4{Z}_4=0$ [all common corner boundary blockages (spherical wedge surfaces) $FHG$ , $S_1{Z}_1{B}_1$ , $S_2{Z}_2{B}_2$ , $S_3{Z}_3{B}_3$ , and $S_4{Z}_4{B}_4$ are zero (absent). The conditions in Eq. (16) are present]. Only in some cases, FHG or JH is present but small ( $FHG$ or $JH\ne 0$ ). Therefore, the effects of the unrealistically approximated corner blockages of the flow boundaries on CSSS (hence on the computation of $S_c)$ are not considerable when experimental and theoretical results are compared in the paper. If the corner blockages were large, they would cause considerable error. To see the effect of the error committed on the results, computed values of $S_c∕D_i$ with error and correct forms in all tables given in the paper are compared in Fig. 1.