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<br />2 <br /> <br />DIVERSION, OUTLET, AND SPILLWAY STRUCtuRES <br /> <br />In <br />In <br />~ <br />C'J <br /> <br />LINING THE TUNNELS <br /> <br />SECTION <br />28 General discuBSion... . . . <br />29 Forms and equipment,. . . . . <br />30 Placing ooncrete lining.. . <br />31 . Tunnel.plllJ( keyways..... . <br />32 Cofferdams at porta,ls. . <br />33 Concrete operations. . . . <br />34 Rates of progress. . . . . . <br /> <br />c <br /> <br />GROUTING AND DRAINAGE <br /> <br />35 General...... <br />36 Grouting...... <br />37 Equipment ... <br />38 Drainage ..... <br /> <br />COST SUMMARY, DIVERSION TUNNELS, , , , , ' <br /> <br />CHAPTER III-COFFERDAMS <br /> <br />DESIGN <br /> <br />39 Introductory statements. . . . . . <br />40 General description........ <br />41 Protection 01 excavation... ..... <br />42 Acceptance of cofferdams. . . . . . . . <br />43 Classification of excavation... . . . <br />44 Earth and rock emba.n.kments. . . . <br />45 Upstream cofferda.m . . . . . . <br />46 Downstream cofferda.m.... <br /> <br />CONSTRUCTION <br /> <br />47 Temporary cofferdams...... ... ." . .. <br />48 Dra.ining the dam site.. . . . . . . .. . . . . . . . . . . . . . . .. . . <br />49 River flow during diversion. . . . . . . . . . . . . . . . . . . . . . . <br />50 Upstream cofferdam............................. <br />51 Downstream cofferdam.. . . . . <br />52 Construction cost... . . . . . <br /> <br />CHAPTER IV-DIVERSION TUNNEL CLOSURE <br />STRUCTURES <br /> <br />RIVER CONTROL DURING CONSTRUCTION <br /> <br />53 Tentative program... . . . '.' . . .. .. . . <br />}j4. Actual program . , . . . . <br /> <br />,{:i: <br /> <br />PAGE <br />47 <br />49 <br />56 <br />60 <br />61 <br />62 <br />63 <br /> <br />64 <br />65 <br />69 <br />72 <br /> <br />74 <br /> <br />77 <br />78 <br />80 <br />80 <br />81 <br />81 <br />82 <br />85 <br /> <br />88 <br />90 <br />92 <br />94 <br />98 <br />100 <br /> <br />101 <br />103 <br />