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<br />. <br />. <br />I <br />. <br />. <br />. <br />. <br />'. <br />. <br />. <br />. <br />. <br />. <br />. <br />. <br />. <br />. <br />. <br />I <br /> <br />6.0 GATE REPAIR <br /> <br />The irrigation releases from Lemon Dam are controlled by two <br />pairs of 2'3" x 2'3" pressure gates located in the gate chamber on <br />the centerline of the dam about 200 feet below the crest. The <br />location of the gates in the gate chamber is shown in Figure 6.1. <br />The downstream gates are used to regulate water releases, while <br />the upstream gates are either open or closed. The downstream <br />gates can be inspected or repaired while the upstream gates are <br />closed; however, the upstream gates cannot be inspected because <br />there is not an easy method to dewater the outlet works upstream <br />of the gates. Hydraulic hoists raise and lower the gates. <br /> <br />The seats on all four gates need to be replaced and include: <br />o One horizontal leaf seat on the movable portion of each <br />gate (shown in Detail D of Drawing 519-D-36 and on Drawing <br />519-D-4l in Appendix B) . <br />o Two vertical leaf seats on the movable portion of each <br />gate (shown in Detail C of Drawing 519-D-36 and on <br />Drawing 519-0-41 in Appendix B) . <br />o One horizontal frame seat on the frame of the gate match- <br />ing the leaf seat. <br />o Two vertical frame seats on the frame of the gate matching <br />the vertical leaf seats. <br /> <br />In order to replace these six seats on each gate, the outlet <br />works must be dewatered and the four gates disassembled. Each of <br />these activities is described in detail in this chapter. De- <br />watering the outlet works also allows for major modifications to <br />be made to the bypass pipe. <br /> <br />6.1 OPTIONS TO CLOSE OUTLET <br />The key activity associated with the repair of the gates is <br />the dewatering of the outlet works. Reclamation provided a method <br /> <br />6.0-1 <br />