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<br />" ,... .' ,- <br />J.J..LJ MAIN AQUEDUCT TUNNELS <br /> <br />147 <br /> <br />the route, one on either side of the Perl' is Valley. The westerly of <br />these ridges closes the eastern side of the Cajalco basin, the site <br />of terminal storage for the main aqueduct and of the first of the <br />several resel'Voirs required on the distributing system. <br /> <br /> <br />Wef'ppipesIO~ , <br />sel w"ere reqUlr<;:o <br />, <br /> <br />.,-1, <br />-5f1el'tlrmP"n 'B'Lme..' Wtl'wfo'be ",.. . 110m of <br />. ~ILWed cOer '-Loose Pr;d: Or"in Dilch <br />RIB STEEL concrelinq LINER PLATE STEEL <br />STEEL SUPPORTW SECTION <br />(b) <br /> <br />U/lSUPPORTEO SEITION <br />(a) <br /> <br />'B'Lmf!. <br /> <br /> <br />IU-- <br />~o71~f:';;C~! 'be''' . <br />qri;)"f~d "''''e~:re. <br />qv,rf'd ' <br />'8'Lme <br /> <br />0, <br /> <br />HYDI<AULlC <br />PI<OPU?T1[S <br />A =/9/.11 <br />V =8.40 <br />Q=/605 <br />("=489 <br />n=OO/3 <br />$=.00065 <br /> <br />!.. M-'~;:.e- '8'[,nl" <br />6'- ~,..... --------'-- <br />'. -12' <br />TIMBER SUPPORTED SECTION <br />(e) <br />Fig. 12-Tuflnel sections <br /> <br />These mountain ranges and masses in the 242 miles from the <br />Colorado River to Cajalco require fOl' their passage 29 tunnels, <br />varying in length from 338 feet in Mecca Pass No.1 to 96,605 feet, <br />or 18.3 miles, in the East Coachella. The combined length of main <br />aqueduct tunnels is 92.1 miles, or 38 pel' cent of the total mileage. <br />Data on tunnel lengths and costs are given iu Table 14, page 177, <br />and typical unsupported and supported cross sections are shown <br />in Figure 12. <br />