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CONTENTS—Continued

Section Page

2. Hydraulic Design of Main. Outlet Works

46. Discharge capacities 64

47. Hydraulic losses 64

(a) Modifications subsequent to construction 69

3. Structural Design of Main Outlet Works

48. General 69

49. Intake structure 69

50. Transition section at upstream portal 72

51. Tunnel upstream of gate structure 72

52. Gate structure and shaft . . . . • 73

53. Tunnel downstream of gate structure 74

54. Diversion channel 74

55. Steel pipe manifold anchorage and valve house substructure 74

56. Control house 74

57. Valve house 74

58. Stilling basin 75

4. Description of Auxiliary Outlet Works

59. Intake structure 75

60. Tunnel upstream of gate chamber 75

61. Gate chamber 75

62. Tunnel downstream of gate chamber 75

5. Hydraulic Design of Auxiliary.Outlet Works

63. General 75

64. Discharge capacities 79

65. Hydraulic computations 79

6. Structural Design of Auxiliary Outlet Works

66. General 82

67. Intake structure and tunnel upstream of gate chamber 82

68. Gate chamber 84

69. Tunnel downstream of gate chamber 84

D. River Diversion During Construction

70. Diversion studies for handling riverflows 84

71. Diversion plan 84

72. Downstream flow requirements 85

CHAPTER V. Design --MECHANICAL AND MISCELLANEOUS INSTALLATIONS

A. Main Outlet Works

73. Stoplogs 87

74. Elliptical intake bulkhead 87

(a) Description 87

(b) Design 87

75. Trashracks 90

(a) Trashracks for main intake structure 90

(b) Trashrack for bypass pipe 90

CONTENTS—Continued

Section Page

76. Ice-prevention air system 90

(a) Description 90

(b) Design 93

77. 6- by 13-foot fixed-wheel gate 93

(a) Description 93

(b) Design 93

78. Hoist and controls for 6- by 13-foot fixed-wheel gate 96

(a) Description 96

(b) Design 96

79. Steel outlet pipe 97

(a) Description 97

(b) Design 101

80. 72-inch ring-follower gates 101

(a) Description 101

(b) Design 101

81. 72-inch hollow-jet valves 101

(a) Description 101

(b) Design 107

82. Controls for 72-inch ring-follower gates and 72-inch hollow-jet

valves 107

(a) Description 107

(b) Design 112

83. 30-inch ring-follower gate 112

(a) Description 112

(b) Design 112

84. 30-inch hollow-jet valve 115

(a) Description 115

(b) Design 115

85. Controls for the 30-inch ring-follower gate and 30-inch hollow-jet

valve 115

(a) Description 115

(b) Design 120

B. Auxiliary Outlet Works

86. Trashracks 120

87. 4- by 4-foot tandem outlet gate and controls 120

(a) Description 120

(b) Design 126 C ON TENTS- - C ontinued

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C. Miscellaneous Equipment for Main and Auxiliary Outlet Works

88. Gate chamber and tunnel ventilation system 127

(a) Description 127

(b) Design 127

89. Electrical system 127

PART m—CONSTRUCTION
CHAPTER VI. Construction --CONTRACT ADMINISTRATION

90. Specifications No. DC-5056—Navajo Dam and Access Roads 133

(a) Orders for changes 133

(b) Extra work orders 134

91. Minor construction contracts 134

92. Government organization 134

93. Contractors' forces 134

(a) Organization 134

(b) Wage rates 136

94. Factors affecting construction progress 137

(a) Weather 137

(b) Labor 137

(c) Other 157

95. Construction equipment 137

96. Safety—Government forces 138

97. Safety—Contractors' forces 138

CHAPTER VH. Construction—EARTH DAM AND APPURTENANT STRUCTURES

98. General 139

99. Diversion and care of the river during construction 139

100. Access and service roads 140

A. Excavation

101. Main outlet works tunnel excavation 141

102. Auxiliary outlet works tunnel excavation 141

103. Excavation for dam foundation 143

(a) Excavation right of station 44+00 143

(b) Excavation left of station 44+00 143

104. Open cut for structures 143

105. Spillway excavation 145

106. Excavation in excavation area 1 145

B. Borrow Area Operations

107. General 146

108. Borrow area group 1 (borrow area E) 146

CONTENTS--Continued

Section Page

109. Borrow area group 2 (borrow areas 9 and D) 146

110. Borrow area group 3 (borrow areas 5. 6, 7, and 8) 147

111. Borrow area group 4 (borrow area 10) 148

112. Borrow area F 149

C. Embankment Operations

113. General 149

114. Zone 1 149

115. Zone 2 151

116. Zone 3 151

117. Earthwork control 151

118. Embankment test installations 151

119. Riprap 151

D. Drilling and Grouting

120. General 153

121. Foundation grouting 153

122. Blanket grouting 156

123. Backfill grouting 156

(a) Main outlet works tunnel 156

(b) Auxiliary outlet works tunnel 156

(c) Access tunnels and gate structure and gate shaft 156

124. Tunnel pressure grouting 156

(a) Main outlet works tunnel 156

(b) Access tunnels and shaft 157

(c) Gate structure and gate shaft 157

(d) Auxiliary outlet works tunnel 157

125. Miscellaneous grouting 157

126. Drilling and grouting equipment 157

127. Contractor's grouting personnel 158

128. Grouting inspection and reports 158

129. Drainage holes 158

E. Concrete Control

130. Concrete batching and mixing plants 159

(a) Temporary plant 159

(b) Central plant 159

131. Concrete aggregates 161

132. Cement 162

133. Curing and concrete protection 162

134. Concrete control and testing 162

F. Concrete Structures and Placement

135. Grout cap 165

136. Spillway 165

137. Main outlet works 172

(a) Intake structure 172

(b) Tunnel 173 CONTENTS--Continued

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(c) Gate chamber 173

(d) Gate shaft 176

(e) Stilling basin 176

138. Auxiliary outlet works and access tunnels 176

(a) Intake structure 176

(b) Access tunnels and access shaft 176

(c) Auxiliary outlet works tunnel 176

(d) Gate chamber 176

139. Miscellaneous structures 179

(a) Control houses and manifold block 179

(b) Piezometer terminal well 179

140. Reinforcement 179

141. Anchor bars 179

142. Tile drains 180

CHAPTER VIE. Construction —INSTALLATION OF METALWORK AND MACHINERY

143. General 181

144. Elliptical intake bulkhead 181

145. Tandem outlet gate 181

146. 6- by 13-foot fixed-wheel gate 182

147. 72-inch ring-follower gates and 72-inch hollow-jet valves 182

148. 30-inch ring-follower gate and 30-inch hollow-jet valve 185

>49. Hydraulic control systems 186

150. Outlet pipe and walkway 186

151. Ice-prevention air system 186

152. Ventilating systems 187

153. Reservoir level recorder and floatwell 187

154. Trashracks 188

CHAPTER IX. Construction --INSTALLATION OF TEST APPARATUS

155. General 189

156. Installation of piezometer tips 189

(a) Foundation tips 189

(b) Embankment tips 189

157. Description of piezometer tips and tubing 189

158. Description of the terminal well 190

159. Filling piezometer tubes with water 190

160. Crossarm settlement installation 191

161. Surface settlement points 192

APPENDIX

A. Cost summary for Navajo Dam, Reservoir, and appurtenant structures,

showing cost of construction and supply contracts and purchase orders

(actual costs to October 31, 1964) 193

B. Construction costs by pay items—Specifications No. DC-5056, Contract

No. 14-06-D-2878--Construction of Navajo Dam and appurtenant

structures 196

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