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<br /><:.::' <br /> <br />oo:.oc <br /> <br />, eWr'r. <br /> <br />'"-.' <br />, . <br /> <br />C,entral Arizona Project Status . <br />Quarterly Update <br />May 1991 <br /> <br />;..,1 <br />Gwes <br /> <br />'C. <br /> <br />,JUN 3 1991 <br /> <br />The first 309 miles of the 336-milc-long Central Arizona Project (CAP) aqueduct, from <br />the Colorado River to thc Brawley Pumping Plant (see attached map), arc fully com- <br />plete and operational. Water is being delivered to users from western Maricopa Coun- <br />ty to the Central Arizona Irrigation and Drainage District's Soulh Main Turnout in <br />southern Pinal County about one mile north of the Red Rock Pumping Plant. <br /> <br />All fC',atures on the remaining 27-miles of the i=iquedurl are under constructio:l or C('nl. <br />plete, but not yet operational. Thesc features arc scheduled to be fully complete and <br />opcrational by February J992, Initial dclivery of CAP water began in April J991 to thc <br />lowcr raw water impoundment at the City of Tucson's water treatment plant; the City <br />anticipates it will begin initial commercial delivery of treated water from its watcr treat- <br />ment plant in late 1991. <br /> <br />Work also is continuing on CAP's Plan 6 features- New Waddell Dam, Stewart Mnun- <br />tain Dam, and Roosevelt Dam, <br /> <br />FoJlowing is the status of construction and water operations for the CAP, <br /> <br />Construction <br /> <br />Siphons <br /> <br />Arizona Projects Office ceased watcr flows in thc CAP aqucduct for 45 days from <br />January 21iJl Fcbruary 15, 1991 to repair known damage areas and inspect for any fur- <br />ther damage in thc 21-foot diameter siphons that carry CAP water under various large <br />washes and riverbcds. The six siphons which wcre inspected and repaired arc the only <br />siphons on the CAP made of precast concrete wrapped in prestressed stcel wires, Por- <br />tions of the wires have corroded and broken, wea~ening some of the 22-foOl-Jong seg- <br />ments making up the siphon pipe; this weakening could cause the pipe to eventually <br />rupture without warning, <br /> <br />Reclamation successfully used repair methods it developed to prevent rupture of known <br />weakencd segments of the corrosion-damaged siphon pipes, It also has dcveloped marc <br />than a dozen inspection methods in an atlempt to locale and <Jctcrminc the extent of the <br />corrosion uamage. Efforl~ to reline the repair J11t.:lhnu:-'l'lllllinuL'. <br /> <br />To dale. no inspection methods ha\.e heen idelltified which can n:liahly h)('ale J (blllage <br />area; clTorb to reliably h)CaLC damage i.lrca~ cllnLillut:. Rt:c1al11i.1lilHl i:-. cnn1uragcd hy lhe <br />dcvclopmental work it is doing in the field of "hydro phonics," having dcmonslrateu thaI <br />this technology allows engineers Lo monitor the sounu given off by a wire wh!;l1 il br!;ah <br />