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<br />~ <br />~ <br />~ <br />~ <br /> <br /> <br />- <br />-' <br /> <br />CONTENTS (Continued) <br /> <br />TUNNEL-PLUG NEEDLE VALVES <br />SECTION PAGE <br />53. Operating program .......................................................................................... 128 <br />54. Coefficient of discharge..nn........_..m......m......___..........__...__n...___..__u._______nh_.. 129 <br />55. Air demand tests..................__....u..........___h......_..._u..........__....................-....... 130 <br />56. Needle-valve ahd emergency-gate modeL...........__......__...__.__...__..__.......__... 135 <br /> <br />CHAPTER V-CHANNEL CONDITIONS BELOW <br />BOULDER DAM <br /> <br />RIVER MODEL <br /> <br />57. Introduction ...................................................................................................... 137 <br />58. Apparatus .......................................................................................................... 137 <br />59. River conditions for flow comhinatioDs......._.._n..........m...m....___.............._n 139 <br />60. Conclusions .._....n............._...._.____n..__....._n....n..._n..........h..n......_...........__......... 148 <br /> <br />BmLIOGRAPRY ............................................................................................ 162 <br /> <br />3 <br />