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4-3-1 Design - Module 4.3 Micro-Hydro Micro 4.3.1 Designing...

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Workshop on Renewable Energies March 17, 2005 Majuro, Republic of the Marshall Islands Module 4.3 Module 4.3 – Micro Micro- Hydro Hydro 4.3.1 Designing 4.3.1 Designing Tokyo Electric Power Co. (TEPCO) e7 / PPA Workshop on Renewable Energies 2 Contents Contents Design for Civil Work Calculation of Head Loss Design of Electrical and Mechanical Equipment
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e7 / PPA Workshop on Renewable Energies 3 1. Selecting a Type of Intake Weir or Dam (a) Concrete gravity dam (b) Floating concrete dam (c) Earth dam (d) Rockfill dam (e) Wet masonry dam (f) Gabion dam (g) Concrete reinforced gabion dam (h) Brushwood dam (i) Wooden dam (j) Wooden-frame dam with gravel Design for Civil Work Design for Civil Work e7 / PPA Workshop on Renewable Energies 4 1-1.Concrete gravity dam Concrete is used for the construction of the entire body. Foundation : Bedrock River conditions : Not governed by gradient, discharge or level of sediment load Intake conditions: Good interception performance and intake efficiency Design for Civil Work
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e7 / PPA Workshop on Renewable Energies 5 1-2. Floating concrete dam Lengthened infiltration path of the foundations by means of cut-off, etc. to improve the interception performance •Foundations : In principle, gravel •River conditions : Not affected by the gradient, discharge or level of sediment load •Intake conditions: Good interception performance and intake efficiency Design for Civil Work Design for Civil Work Longer Cut-off e7 / PPA Workshop on Renewable Energies 6 1-3. Earth dam Earth is used as the main material for the body. The introduction of a riprap and core wall may be necessary depending on the situation. •Foundations : Variable from earth to bedrock •River conditions : Gentle flow and easy to deal with flooding •Intake conditions: High interception performance and good intake efficiency Design for Civil Work Design for Civil Work
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e7 / PPA Workshop on Renewable Energies 7 1-4. Rockfill dam Gravel is used as the main material for the body. The introduction of a core wall may be necessary depending on the situation. •Foundations : Various, from earth to bedrock •River Conditions : River where an earth dam could be washed away by normal discharge •Intake conditions: Limited to the partial use of river water due to the low intake efficiency Design for Civil Work Design for Civil Work e7 / PPA Workshop on Renewable Energies 8 1-5. Wet Masonry Dam Filling of the spaces between gravel with mortar, etc. •Foundations : Various, from earth to bedrock •River conditions : Not affected by the gradient, discharge or level of sediment load •Intake conditions: Good interception performance and intake efficiency Design for Civil Work Design for Civil Work
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e7 / PPA Workshop on Renewable Energies 9 1-6. Gabion Dam Gravel is wrapped in metal net to improve integrity.
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