SOCIALIST REPUBLIC OF VIETNAM Ministry of Construction (MOC) Guideline for Technical Regulation on Hydropower Civil Works Design and Construction of Civil Works and Hydromechanical Equipment Final Draft June 2013 Japan International Cooperation Agency Electric Power Development Co., Ltd. Shikoku Electric Power Co., Inc. West Japan Engineering Consultants, Inc. IL CR(2) 13-096 Guideline for QCVN xxxx : 2013/BXD Table of Contents 1. Scope of application .................................................................................................. 1 2. Reference documents ............................................................................................... 1 3. Nomenclatures and definitions ................................................................................. 1 4. Classification of works .............................................................................................. 1 4.1 General stipulation ................................................................................................. 1 4.2 Principles for the classification of hydropower works .............................................. 2 5. Guarantee of serving level of hydropower works .................................................... 7 6. Safety coefficient of hydropower civil works ........................................................... 7 7. Construction of hydropower civil works ................................................................ 26 7.1 General requirements .......................................................................................... 26 7.2 Reservoir ............................................................................................................. 49 7.3 Dams ................................................................................................................... 53 7.4 Spillways .............................................................................................................. 83 7.5 Waterway ............................................................................................................. 90 7.6 Intakes ................................................................................................................. 95 7.7 Settling basins ...................................................................................................... 98 7.8 Head tanks and surge tanks ............................................................................... 101 7.9 Penstocks .......................................................................................................... 103 7.10 Tailraces ............................................................................................................ 106 7.11 Outlets ............................................................................................................... 107 7.12 Hydropower plants (Powerhouse) ...................................................................... 107 7.13 Daily storage reservoir ....................................................................................... 110 7.14 Bottom discharge ............................................................................................... 110 7.15 Protective works of reservoirs, headwork area and downstream of headwork .... 112 7.16 Observation device system of the work .............................................................. 112 8. Hydromechanical equipments .............................................................................. 132 8.1 General requirements ........................................................................................ 132 8.2 Valve gates ........................................................................................................ 142 8.3 Trash rack .......................................................................................................... 149 8.4 Steel penstock ................................................................................................... 150 9. Stipulation of management ................................................................................... 154 10. Organization for implementation .......................................................................... 154 Appendix A ...................................................................................................................... 155 Appendix B ...................................................................................................................... 155 Appendix C ...................................................................................................................... 156 Appendix D ...................................................................................................................... 171 i Guideline for QCVN xxxx : 2013/BXD List of Tables Table 4.2-1 Criteria for Project Ranking ............................................................................................. 3 Table 4.2-2 Size Classification............................................................................................................ 3 Table 4.2-3 Hazard Potential Classification ........................................................................................ 3 Table 4.2-4 Criteria for Hazardous Level ........................................................................................... 4 Table 6.1-1 Loads imposed on dam body ........................................................................................... 8 Table 6.1-2 Loads imposed on dam bodies ......................................................................................... 8 Table 6.1-3 Basic definition of loads .................................................................................................. 9 Table 6.1-4 Design seismic coefficient ............................................................................................. 10 Table 6.1-5 Uplift under various conditions ..................................................................................... 10 Table 7.1-1 Criteria for Project Ranking ........................................................................................... 33 Table 7.1-2 Criteria of Design and Check Flood (Return Period to be Applied) .............................. 34 Table 7.1-3 Size Classification.......................................................................................................... 34 Table 7.1-4 Hazard Potential Classification ...................................................................................... 34 Table 7.1-5 Recommended Safety Standards ................................................................................... 34 Table 7.1-6 Criteria for Hazardous Level ......................................................................................... 35 Table 7.1-7 Tanaka’s rock classification method used for dam foundation ...................................... 40 Table 7.3-1 Crest elevation of non-overflow section of dam ............................................................ 55 Table 7.3-2 Wave heights by fetch and wind velocity ...................................................................... 57 Table 7.3-3 Normal freeboard and minimum freeboard ................................................................... 57 Table 7.3-4 Crest elevation of non-overflow section of dam ............................................................ 73 Table 7.3-5 Wave heights by fetch and wind velocit ........................................................................ 76 Table 7.3-6 Normal freeboard and minimum freeboard ................................................................... 76 Table 7.3-7 Lugeon values and infiltration factors according to dam height .................................... 82 Table 7.4-1 Criteria for Project Ranking ........................................................................................... 85 Table 7.4-2 Criteria of Design and Check Flood (Return Period to be Applied) .............................. 85 Table 7.4-3 Size Classification.......................................................................................................... 85 Table 7.4-4 Hazard Potential Classification ...................................................................................... 86 Table 7.4-5 Recommended Safety Standards ................................................................................... 86 Table 7.4-6 Criteria for Hazardous Level ......................................................................................... 86 Table 8.1 Classification of forces on gates .................................................................................. 140 Table 8.2 Classification of forces on penstocks ........................................................................... 141 ii Guideline for QCVN xxxx : 2013/BXD List of Figures Fig.6.1-1 Typical loads acting on dam body ................................................................................... 9 Fig.6.1-2 Expected function of drains ........................................................................................... 10 Fig.7.1-1 Process for decision of environmental flow rate ............................................................ 28 Fig 7.1-2 Hydraulic analyses of discharge facilities ...................................................................... 31 Fig 7.1-3 Area of grouting ............................................................................................................. 43 Fig.7.1-4 Estimation of Lugeon value ..........................................................................................