Flow-boundary effects on critical submergence of intake pipe

In this study, the effects of intake-pipe blockage and location of impervio us boundaries on critical submergence of an intake pipe are presented. Expe riments were conducted on a horizontal intake pipe sited in a dead-end cana l flow. Theoretical results and available experimental data are compared. I t is shown that, as the distance between the intake-pipe entrance and the d ead end gets smaller than the critical submergence depth, the deviation bet ween theoretical and experimental results increases. A potential flow solut ion still gives acceptable results when this distance is smaller than the c ritical submergence, but it overpredicts by about 80% when the distance bet ween the intake-pipe entrance becomes much smaller than the critical submer gence depth.