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.~ ~ Ifj <:': c CONTENTS (Continued) SIDE CHANNEL SPILLWAY WITH DRUM GATES (M-I AND M-2) SECTION PAGE 23. Design and construction of 1 :20 modeL..............hmhm___......................___.. 54 24. Results from original design.__....u.......__.__u.u...u..__....................__n............... 58 25. Increased slope in channel fioor............................m.m...__._____.. mm"m'__n___ 64 26. Coping on rear wall of channeL.m.mmmn...nmn...................hh................... 65 27. Flat-top contraction in transition.....................____ mnnm___n .....__..__m...__.. 66 28. Improved portal shape.................................................................................... 68 29. Vanes in inclined tunnel.........mhm.___ummn.m..............n.....___n....mn..n........ 68 30. Cylindrically faced baffles.............................................................................. 70 31. Sills on channel floor._............h...h........n.n.n.u......m..uu............h.............,..,. 73 32. Deflector vanes on spillway.............................._.._....._.._n_........_..................... 73 33. Troughs in floor of channel........................................................................... 74 CHAPTER III-MODELS OF SEMI"FINAL DESIGN OF SPILLWAYS MODEL WITH DRUM GATES, 1:60 SCALE (C-4) 34. Design and construction of modeL.......................h.mn........_...mm....h....... 77 35. Results from original designmn_...uu..._._n....._n_..._........_.._.__.......__.u.._.......... 79 36. Channel extension of 60. feeL.mmmm_..__n..........mm...._.m........._...nun....m. 79 37. Cross-weir at end of channeL_m________....__......__.......m....m___mm..m.m..m.m. 81 38. Offset in channel waIL_.......m....._mn....____ .........._.......................______..___........ 81 39. Improvement of transition sbape__.___._.._..u._._n.._............._..._......_.u.......___u.. 82 4(}. Curved wall at upstream end..._._.........nm..._.mmu....._._n.................._....._.._. 84 41. Installation of Baffles...................................................................................... 90 42. False floor across channeL...._..._______u._.............._.............._._........_....._....m..n 92 43. Trough in front half of cbanneI.................................................................... 92 44. Deflectors on crest side..._...._.._...................._.........._ .._m...._...__._..._.._..._..._...... 97 45. False wall in channeL...m__..._._..._.__......_............_n...._.m_n...._..........._...u.m... 9'7 MODEL WITH DRUM GATES, 1:20 SCALE (M-3) 46. Design and construction of modeL.........m........mm_m___mnm.___u.._.._.._...... 97 47. Results from original design....mm___....m___._umn..._.......mmmhmum_mmm.. 99 48. Curved wall at upstream end....._m__...................._....._._................m......._._... 100 49. Installation of dentated batfles..._..__......__._......_.....m......n...m._.._._...__._.._._.... 10.0. 50. Flow conditions, drum gates raised........___n.....................n..m___nm_m____.n 102 51. Direction of currents._...........m......_........._.........m....m._........................._..._.... 10.4 52. Air content of water...........mu....m.......____.._..___........m._..._......__._._...m........... 104 53. Measurement of air content......m..._.m__..u_........................................_......._...104 54. Results of air measurements.........._...._.__.......m...._.._._n._.._...._.._..._......_......... 105 55. Accuracy of methods........................................................................................ 108 56. Model and prototype results......_.._...._._.__......u_.._.u...uuu_......_.....__...........____ 109 57. Conclusions on air contenL........_.._.m..........._._......m._._._m...._....................... 10.9 DRUM-GATE MODEL, 1:100 SCALE (M-4) 58. Description and results.._......n. m_.___._ 2 110