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(X) ~ "'~ N c CONTENTS (Continued) CHAPTER VII-CONCLUSIONS SUMMARY OF RESULTS SECTION PAGE 8<1. Spillway channel................... ...................... ................................................... 183 81. Transition .__...n..........n_..u.............n___....___......___..____............__.......n._n_......u__.. 184 82. Tunnels .............................................................................................................. 184 83. Resistance to erosion.__.n.n.........n...n......__n.m...n.....................h.__m_..___......... 185 BIBLIOGRAPHIES 84. Theory of similitude.m........___...-.....___...__ ...___........_....____... __"....hu._______m_____ 185 85. Side-channel spillways ...................................... ........................................... 187 86. Erosion effects of high velocities..................mm................__...........n.....nhu 188 LIST OF FIGURES FIGURE TITLE PAGE Frontispiece-Boulder Dam from Nevada side showing intake towers and 1 spillways .._.___._....................._____.._...........___...n_n_...___n.......______........._._.._..._. iii Boulder Dam and appurtenant works......__..........................................___..... iv Boulder Canyon Project-location map....__................................................ v 1. General plan of Arizona spillway.........................___...................................... 11 2. General plan of Nevada spillway.............................__................................... 12 3. Hydraulic laboratory at Colorado State College........................................ 14 4. Diagrammatic layout-Montrose, Colorado, laboratorY......m___mmm..... 16 5. Glory hole or shaft spillw.y.......................................................................... 19 6. Construction of paraffin crest of glory hole modeL.................................. 20 7. Nevade side-channel spillway. free-crest type___...................m.....__....__.... 23 8. Model of side-channel spillway with rounded bottom.............................. 26 9. Flow in trapezoidal channel of model C-2.......m.....___m.....____m................ 27 10. Water surface profiles in model 0-2............................................................ 29 11. Water surface profiles, cross-weir in model 0-2................___m...........m.... 30 12. Water surface profiles, false bottom in model C-2.m....___m...................... 31 13. Water surface profiles, rounded bottom in model 0-2___..___....___............... 32 14. Position of vanes and direction of flow in Model C-2__m......................... 32 15. Water surface profiles in channel with guide vanes..m.___...___................. 33 16. Nevada spillway with Stoney gate................................................................ 35 17. Plan of I :60 model of Stoney gate spillway................................................ 36 18. Elevation and sections of 1:60 Stoney gate modeL....__................___..___.... 37 19. Stoney gate spillway modeL........................................................................... 38 20.. Water surface profiles, Stoney gate-model C-3........................................ 42 21. Water surface profiles and pressures on channel bottom, model 0-3.... 43 22. Discharge coefficients for flow under Stoney gate........___......................... 47 23. Discharge coefficients, Stoney gate entirely open................__.................... 50 24. Interference of floW's.....___........................__.....___.............................................. 51 25. Stoney gate model with dentated b.ffle...................................................... 52 26. Approach channel to Stoney gate................................................................ 53 4 -