FOREWORD Technical records of design and construction are a series of publications which record the planning, design, construction, and initial operation of Bureau of Reclamation structures. This technical record of design and construction for Navajo Dam is divided into three parts. Part I is devoted to general planning, historical information, a brief description of the features, a summary of costs, and geology. In part II, there are three chapters covering the design of the various features and their components. Part in contains one chapter on contract administration and three chapters comprising a concise narration of construction operations. This technical record was prepared by the Technical and Foreign Services Branch of the Office of Chief Engineer in Denver, Colo., from final design reports submitted by the design branches, final construction reports and cost information submitted by the field offices, and various planning reports. Acknowledgment is gratefully made to the designers and field personnel for their contributions to this work. There are occasional references to proprietary materials or products in this technical record. These must not be construed in any way as an endorsement, as the Bureau cannot endorse proprietary products or processes of manufacturers or the services of commercial firms for advertising, publicity, sales, or other purposes. CONTENTS Foreword Section Page PART I--INTRODUCTION 1. Location and purpose of dam 1 2. Climate of basin 1 3. History and settlement of basin 1 4. Local industry 5 5. Colorado River Storage project 5 6. Brief description of Navajo unit features 5 (a) Navajo Dam 5 (b) Navajo Reservoir 8 7. Authorization 8 8. Cost summary 8 CHAPTER E. GEOLOGY 9. Regional geology 9 10. Foundation investigations 9 11. Damsite geology 9 12. Special foundation conditions 9 13. Reservoir geology 12 PART H— DESIGN 14. General description of features 13 15. Centerline location 13 16. Foundation treatment 13 (a) Excavation for dam foundation 13 (b) Disposal of material excavated from dam foundation 15 (c) Pressure grouting 15 17. Stability analysis 15 18. Construction materials 16 (a) Borrow areas 16 (b) Distribution of materials 17 (c) Riprap 21 19. Embankment zoning 21 20. Slope protection 26 21. Miscellaneous details 26 (a) Service road and crest details 26 (b) Seepage and open drains 26 (c) Specially compacted earthfill 26 22. Instrument installations 26 (a) Description of installations 26 (b) Special observations 32 CONTENTS—Continued Section Page CHAPTER IV. Design —SPILLWAY AND OUTLET WORKS A. Spillway and Outlet Works Design Criteria 23. Design flood studies 37 (a) Historical flood 37 (b) Development of a snowmelt flood 37 (c) Development of the maximum probable rain flood 37 (d) Routing criteria 37 (e) Frequency studies 37 24. Reservoir operations 37 (a) Reservoir storage allocations 37 (b) Reservoir operation plan . 40 25. Spillway requirements 40 26. Tailwater studies 40 27. Preliminary studies and designs 42 (a) 1950 design 42 (b) 1954 design 42 (c) Feasibility design 42 B. Final Spillway Design 28. General description 46 29. Design capacity 46 30. Crest design 46 31. Hydraulic design 46 32. Hydraulic model studies 52 33. Structural design 52 (a) General 52 (b) Met and crest structure 52 (c) Spillway bridge 54 (d) Chute walls 54 (e) Chute floor and drainage gallery 54 (f) Stilling basin walls 54 (g) Stilling basin floor 55 (h) Outlet channel 56 C. Final Outlet Works Design 34. General description 56 35. Hydraulic capacities 56 36. Selection of outlet works arrangement 56 1. Detailed Description of Main Outlet Works 37. Intake structure 58 38. Tunnel upstream of gate structure 58 39. Gate structure and shaft 58 40. Tunnel downstream of gate structure 58 41. Tunnel access house 58 42. Manifold block and valve house 58 43. Control house 64 44. Stilling basin 64 45. Outlet channel 64 |