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<br />001654 <br /> <br />Technical Memorandum No. NA V -8130- TM-98-I <br />OUTLET WORKS DISCHARGE CAPACITIES - NAVAJO DAM <br /> <br />Table of Contents <br /> <br />~ <br /> <br />1. Purpose and Scope ofW ork ................................................. 1 <br /> <br />n. Hydraulic Design Considerations ........ . . . . . . . . . . . . . . . . . . . . . . , . . . . . . . . . . . . . . 1 <br /> <br />A. Main outlet works .................................................. 1 <br /> <br />B. Auxiliary outlet works ............................................... 5 <br /> <br />C. NIIP canal outlet works .............................................. 7 <br /> <br />D. Power plant ....................................................... 7 <br /> <br />E. Maximum discharge capacities for all features . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8 <br /> <br />m. Hydraulic Model Studies and Field Testing . . . . . . . . . . . . . . . . . . . . . < . . . . . . . . . . . . . . 10 <br /> <br />A. Main outlet works ................................................. 10 <br />1. Abrasion damage. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .'. . . . . . . . 11 <br />2. Cavitation damage, . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16 <br />3. Gas supersaturation . . . . . . . . . . . . . . . , . . . . . . . . . . . . . . . . . . . . . . . . . . . 16 <br />4. Pipeline flow instability ........................................ 16 <br /> <br />B. Auxiliary outlet works ........,..................................... 17 <br />1. Air slot modification ...,...................................... 17 <br />2. Gas supersaturation modifications .. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18 <br /> <br />IV. Current Condition of Mechanical Features .................................... 18 <br /> <br />A. Main outlet works ...................,.....,....,...,..,........... 18 <br />1. 6- by 13-foot Fixed-wheel gate ......,...,....................... 18 <br />2. 72-inch Hollow-jet valves ............................,.......,. 20 <br />3. 72-inch Ring-follower gates . . . . . . . . . . , , . . . . . . , . . . . . . . . . . . . . . . . . . 21 <br />4. Wye branch tie rods. . . . . . . . . . . . . . . . , . . . . . . . . . . . . . . . . . . . . . . . . . . 21 <br /> <br />B. Auxiliary outlet works ...........................,.................. 23 <br />1. 4- by 4-foot Outlet gates . . . . . . . , . . . . . . . . . . . . . . . . . . . . . . , . . . . . . . . 23 <br /> <br />V. Conclusions . . . . . . . . . . . . . . . . . . . . . . , . . . . . . ; . . . . . . . . , . . , . . . . . . . . . . . . . . . , . . 23 <br />