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<br />. <br /> <br />......, I''''' <br />l'.~41 <br /> <br />. <br />I, <br />i <br />, <br /> <br />. <br /> <br />47 <br /> <br />These i~vcstigations see~ad to indic~te th~t no ~~t3rial <br /> <br />saving could be mEldc 'loy c.dolOting such ?, pl:.n CIS compe.red \1ith <br /> <br />a concrete structure c~rri"d to bed rock providing the latt3r <br /> <br />proved feasiblo ~t all, A depth of 135 feet to bed rock <br /> <br />while presenting serious difficulties in found~tion work, is <br /> <br />believed to be entiroly f'3"sible if pro!,cr prepar2.tions are <br /> <br />made and proper pl~ns ~r~ !ollowod. <br /> <br />It is not bolicved tl:?t wi thi~ roe.sonZl.ble cost it is <br /> <br />eitho~ f~asiblc or nocess~"y to divert the entire flood flow <br /> <br />of the Colorado Riv~r, whieh ~,y at t~~s reach 200,J00 <br /> <br />cubic fcat per second. The ~l~n is to dcsign a thin ?xch <br /> <br />of such radius 2.l1d diruc01sions e.s to be safe ,vi th its b'.se <br /> <br />upon the found3.tion !'ock ~"::'1d. its sumr;u. t a.bout 40 f00t ew"oovc <br /> <br />the low w~ter 13vul of the rivGr. Within this limit t~e <br /> <br />canyon is qui t3 n31'row, being at 311 points less tn'\ll 350 foot <br /> <br />in width, ~ld thorcforc " structure of s~ort r~dius ~~d light <br /> <br />Section would be safe. After the const!"Uctio!l 0: a coff3r d?JIl <br /> <br />and of divorsion tunnols of sufficient c~p3city to c'~r.r the <br /> <br />ordin3.i"'Y flo\"l 311d moder2..tc :::'1006..8 of thl3 ri vcr. exc3.vation <br /> <br />would be undert3kor. of only sufficient '-lidtil to sec-ne found3.- <br /> <br />tion for this thin arch, end. t;lis would be ccmlpleted and the <br /> <br />arch poured during the 9 ~onths or so in which it would be <br /> <br />possible to UIlW?te:;:o t'::le fO':t.~dation by means af t'::le tunndls =d. <br /> <br />coffsr dsm. <br /> <br />This thin .?.rch would S.Jrve as a. subsequ3nt coffer dam <br />