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<br />DIVERSION TUNNELS <br /> <br />.r-- <br />~ <br />~ <br />C'1 <br /> <br />BEOl'ION PAGE <br />61 Excavation ..............___...__........nn....__....__nu..uun_.........__....__u..._h................____. n.... 116 <br />62 Concrete l1ning ..___......._n__...h......_..____...___..............._nn_...................................__..____ 118 <br />63 Grouting and drainage mnm............................_._.__...n..dh...........................______.... 126 <br /> <br />r <br />~ <br /> <br />COFFERDAMS <br /> <br />64 General description. m.........._.......____............. .m...........__.___h.................._____. 125 <br /> <br />65 Upstream cotrerdalD. .................._n...h............_._ ._____..........__...,.__.____...................... 125 <br />66 Downstream cofferdam .............m................nnnn........____............_.......__nnnn........ 128 <br />67 Unwaterlng the dam site ...._...___.___n._......._...mnn...........__.................................... 128 <br /> <br />RIVER CONTROL DURING CONSTRUCTION <br /> <br />68 Tentative program h....................................................................... .................. 129 <br />69 Actual program h......... ............................ ............................................ ........0....0.... 130 <br />70 Diversion tunnel gates ...................... ................................................................... 131 <br /> <br />71 Tunnel plugs ......................................... ........._........................................................ 132 <br /> <br />CHAPTER VII-BOULDER DAM <br /> <br />DESIGN OF DAM <br /> <br />72 General description ......... ............................. ............---..... ....................... 137 <br />73 Basis tor design .. .................... ............................ ........................................... 139 <br />74 Stress investigations .... ........................... ..................___................................. 140 <br />76 Model tests ................................................h............... .............................................. 142 <br />76 Mass concrete investigations ..h..._.........___,....................................... ................. 143 <br /> <br />FOUNDATION AND ABUTMENT PREPARATION <br /> <br />77 Excavation .................................................... <br />78 Grouting operations .............. ..................... <br /> <br />146 <br />147 <br /> <br />CONSTRUCTION OF DAM <br /> <br />79 Block system .................................................................. ......................................... 148 <br />80 Ooncrete placing ...................................................................................................... 162 <br />81 Cooling the concrete ............ ..........................n.......................................... 164 <br />82 Contraction joint grouting .................................................................................. 166 <br />83 Galleries and shafts ......___...............n.........................................................m........ 157 <br /> <br />84 Drainage ....nnnm.nn.......mmn.nnn.n...nmn.m...m.nnnn..nn..........nnnnn..nm.....m... 169 <br />85 Electrical and mechanicallnstallat10ns ............................................................ 160 <br />86 Research measurements .............................................................0........................ 161 <br />