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~\Hydraulic Model Study ~Of Buffalo Bill Dam and Spillway Rehabilitation

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~\Hydraulic Model Study ~Of Buffalo Bill Dam and Spillway Rehabilitation GR-87-6 ~\HYDRAULIC MODEL STUDY ~OF BUFFALO BILL DAM AND SPILLWAY REHABILITATION September 1987 Engineering and Research Center • U.S. Department of the Interior Bureau of Reclamation Division of Research and Laboratory Services Hydraulics Branch 7-2090 (4-81) i Bureau of Reclamation TECHNICAL REPORT STANDARD TITLE PAGE iT,AGG~ION NO. ,~#~(~:~:::~;~: 3. RECIPIENT'S CATALOG NO. I ~i~i~;~;~!~:J:,.~i, ~i;..-;: G R - 87 - 6 i :iiii~:!i~,~;:;! ;::, ~,::: 5. REPORT DATE I 4. TITLE AND SUBTITLE Hydraulic Model Study September 1987 of Buffalo Bill Dam 6. PERFORMING ORGANIZATION CODE and Spillway Rehabilitation D-1531 i 7. AUTHOR(S) 8. PERFORMING ORGANIZATION REPORT NO. Kathleen L. Houston GR-87-6 i 9, PERFORMING ORGANIZATION NAME AND ADDRESS 10. WORK UNIT NO. Bureau of Reclamation I Engineering and Research Center 11. CONTRACT OR GRANT NO. Denver, CO 80225 13. TYPE OF REPORT AND PERIOD COVERED 12. SPONSORING AGENCY NAME AND ADDRESS I Same 14. SPONSORING AGENCY CODE I DIBR 15. SUPPLEMENTARY NOTES Microfiche or hard copy available at the E&R Center, Denver, Colorado I Editor:RC(c)/SA 16. ABSTRACT 'i A new, increased inflow design flood and increased power generation requirements for 75-year-old Buffalo Bill Dam prompted modifications to the existing dam, spillway, and powerplant. A hydraulic model study investigated the proposed designs for the spillway and dam rehabilitation. The spillway approach channel configuration was determined and gate ,! open!ng discharge curves were developed for 20.5- by 28-foot top-seal radial gates op- erating under a maximum head of 115 feet. The spillway tunnel geometry was changed to a modified horseshoe shape and realigned to reduce the potential for erosion in the riverbed downstream. A broad crest shape was developed for passing discharge over the top of the i dam. I I I 17. KEY WORDS AND DOCUMENT ANALYSIS a. DESCR IPTORS-- hydraulic model study/tunnel spillway/top-seal radial gates/approach flow/ I river channel erosion/dam overtopping i b. IDENTIFIERS-- Buffalo Bill Dam and spillwaY, Cody, Wyoming c. COSATI Field~Group 13M COWRR: 1313.1 SRIM: I t8. DISTRIBUTION STATEMENT 19. SECURITY C LASS 121. NO. OF PAGE,~ (THIS REPORT) UNCLASSIFIED / 44 20. SECURITY CLASS 22. PRICE I (THIS PAGE) UNCLASSIFIED i GR-87-6 I HYDRAULIC MODEL STUDY '1 OF BUFFALO BILL DAM I AND SPILLWAY REHABILITATION I .| 8 I by I Kathleen L. Houston I r I I i Hydraulics Branch Division of Research and Laboratory Services I Engineering and Research Center Denver, Colorado I September 1987 UNITED STATES DEPARTMENT OF THE INTERIOR 11r " BUREAU OF RECLAMATION ACKNOWLEDGMENTS I The model study was initiated by the Concrete Dams Branch, Division of Dam and Waterway Design. Throughout the study, David Hinchliff and Guy S. Lund of that branch provided cooperation and assistance. ! Supervision was provided by Thomas J. Rhone, Head, Hydraulic Structures Section, Division of Research and Laboratory Services. The assistance of Christi A. Young, rotation engineer, was greatly appreciated. Her dedicated work during the model design, construction, and data gathering was invaluable. Photographs were taken by Wayne K. Lambert. I l, I As the Nation's principal conservation agency, the Department of the Interior has responsibility for most of our nationally owned public lands and natural resources. This includes fostering the wisest use of our land arid water resoumes, protecting our fish and wildlife, preserv- ing the environmental and cultural values of our national parks and historical places, and providing for the enjoyment of life through out- door recreation. The Department assesses our energy and mineral resoumes and works to assure that their development is in the best interests of all our people. The Department also has a major respon- sibility for American Indian reservation communities and for people who live in Island Territories under U.S. Administration. The information contained in this report regarding commercial prod- ucts or firms may not be used for advertising or promotional purposes and is not to be construed as an endorsement of any product or firm by the Bureau of Reclamation. m. i i "41 I i I, ~i~ ~ i i I I i | I ~,~ ~-- I I i Frontispiece. - Buffalo Bill Dam spillway and Shoshone Powerplant. I iii Ii i CONTENTS Page Purpose ...................................................................................................................................... 1 Introduction ................................................................................................................................. 1 Results and recommendations ...................................................................................................... 2 Hydraulic model and test procedures ............................................................................................ 3 Spillway investigation ................................................................................................................... 4 Approach channel .................................................................................................................... 4 Gate chamber location ............................................................................................................. 6 Tunnel capacity ........................................................................................................................ 7 Tunnel geometry ...................................................................................................................... 8 Tunnel lining ............................................................................................................................ 9 Unbalanced gate operations ..................................................................................................... 9 Downstream tunnel alignment ................................................................................................... 10 Downstream river channel erosion ............................................................................................ 11 Dam overtopping ......................................................................................................................... 12 Outlet works gate chamber ...................................................................................................... 12 Broad crest ............................................................................................................................. 13 Sharp crest ............................................................................................................................. 13 Crest selection ........................................................................................................................ 14 FIGURES Figure Frontispiece - Buffalo Bill Dam spillway and Shoshone Powerplant .................................................. iii 1 Existing hydraulic structures at Buffalo Bill Dam ................................................................ 15 2 General plan of proposed spillway and dam modifications at Buffalo Bill Dam ...................... 17 3 General plan of final spillway and dam modifications at Buffalo Bill Dam .............................. 19 4 Final modifications for spillway intake structure (2 sheets) ................................................. 21 5 Overall view of 1:42.783 scale model of Buffalo Bill Dam .................................................. 25 6 Proposed gate chamber location and tested excavations ................................................... 26 7 Gate chamber approach channel with existing side channel weir at elevation 5360.0 .......... 27 8 Impingement on gate trunnions with existing side channel weir at elevation 5360.0 ............ 27 9 Gate chamber approach channel with berm elevation 5320.0 ............................................ 28 10 . Discharge curves for original gate and tunnel design ......................................................... 29 11 Recommended approach channel excavation .................................................................... 30 12 Discharge curves for final gate and tunnel design .............................................................. 31 13a Original tunnel design, gates 10 percent open .................................................................. 32 13b Original tunnel design, gates 50 percent open .................................................................. 32 13c Original tunnel design, gates 100 percent open ................................................................ 33 14a Final tunnel shape, gates 10 percent open ....................................................................... 34 14b Final tunnel shape, gates 50 percent open .~ ..................................................................... 34 14c Final tunnel shape, gates 100 percent open ..................................................................... 35 15 Existing spillway tunnel discharging approximately 6,000 ft3/s ........................................... 35 16 Excavated channel downstream of the existing spillway tunnel ........................................... 36 17 Spillway jet impinging on canyon wall before realignment of the end of the tunnel, Q = 75,000 ft3/s ........................................................................................................ 36 18 Spillway jet impinging at the base of the cliff after realignment of the tunnel, Q = 75,000 ft3/s.. ' 37 19 Tailwater rating curve for the river reach downstream of the dam .....................................
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