SMALL DAMS

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S mall concrete dams Here we give four examples of medium-size dams (21 to 25 metres) and one small dam (16 metres) that illustrate the various paths that may be followed. Design of small or medium height RCC dams is not fundamentally different, and these case studies could serve as examples for smaller dams with no major changes. RIOU DAM (SEE PHOTO 23 P. VIII) Riou dam (figure 3) was built by EDF; the dam is 21 metres high and involves 42 000 m 3 of RCC. It was extensively analysed within the framework of the French national research project on RCC entitled BaCaRa. The selected cross-section was a trapezoidal shape with a vertical upstream face, a downstream face sloped at 0.6H/1V and a crest width of 5.40 metres. The dam's watertightness was provided by a PVC geomembrane fastened on the upstream face with steel anchors, while the foundation was treated with a grout curtain. The dam body and its foundation were drained from a gallery in the lower part of the cross-section. The downstream face was free overflow for a width of 65 metres, and used as a stepped spillway chute. 130 Fig. 3 - Typical cross-section of the Riou RCC dam - Faced with impervious geomembrane
Chapter V The typical cross-section of this dam was noteworthy in comparison to larger structures because of the use of the impervious facing geomembrane and the absence of vertical contraction joints. VILLAUMUR DAM Villaumur dam (figure 4) is the smallest French dam built of RCC; it stands 16 metres high and involved 10 000 m 3 of RCC. The trapezoidal cross-section is thick, which meant no gallery had to be built. Here the dam was made watertight by a reinforced concrete face built slightly in advance of RCC placement. A geotextile connected to a series of PVC outlets served to drain the facing. The dam foundation interface is drained through a layer of porous RCC that comes out slightly below natural ground level in a wedge of rockfill. 131 Fig. 4 - Typical cross-section of Villaumur RCC dam
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FRENCH COMMITTEE ON LARGE DAMS COMI
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PHOTOGRAPH REFERENCES Cover: CACG,
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M E M B E R S O F T H E R E A D I N
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TABLE OF CONTENTS Foreword - What n
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Table of contents FILL DAM DESIGN..
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Table of contents Chap. VII - Life
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W hat need for guidelines for small
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W hat need for guidelines for small
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C hoice of site and type of dam TOP
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C hoice of site and type of dam AVA
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C hoice of site and type of dam CON
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P reliminary determination of desig
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G eological and geotechnical studie
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F ill dams GEOTECHNICAL STUDIES 68
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F ill dams For fill, the wetter the
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F ill dams 72 If the latter is unal
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F ill dams As concerns freeboard R,
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F ill dams Wave height h (m) Thickn
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F ill dams In the case of a widely
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F ill dams Fig. 3 - Sloped granular
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F ill dams It is therefore necessar
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F ill dams The selected profile sho
Page 85 and 86: F ill dams 86 Case of compressible
Page 87 and 88: F ill dams In present practice, the
Page 89 and 90: F ill dams MONITORING SYSTEM 1 The
Page 91 and 92: F ill dams The most common measurem
Page 93 and 94: F ill dams 94 When H 2 V > 30, the
Page 95 and 96: F ill dams DESIGN OF THE FREE OVERF
Page 97 and 98: F ill dams 98 In the case of very w
Page 99 and 100: F ill dams TENDERING AND DAM CONSTR
Page 101 and 102: F ill dams In the case of a rock fo
Page 103 and 104: F ill dams However, when the materi
Page 105 and 106: F ill dams All of the inspections m
Page 107 and 108: F ill dams SPECIFIC FEATURES OF VER
Page 109 and 110: F ill dams !"engineering costs. The
Page 111 and 112: ▲ 1 - Compacting clay in the cut-
Page 113 and 114: ▲ 7 - Scarification after passage
Page 115 and 116: ▲ 12 - Rip-rap on a dam built for
Page 117 and 118: ▼ 20 - Overspill part of a side i
Page 119 and 120: C H A P T E R V Small concrete dams
Page 121 and 122: Chapter V Arch dams Arch dams trans
Page 123 and 124: Chapter V Masonry dams are no longe
Page 125 and 126: Chapter V Finally, the slope of the
Page 127 and 128: Chapter V FOUNDATION TREATMENT Hydr
Page 129 and 130: Chapter V and account will be taken
Page 131 and 132: Chapter V Thrust of ice This force
Page 133 and 134: Chapter V The commonly accepted cri
Page 135: Chapter V MONITORING SYSTEMS The ge
Page 139 and 140: Chapter V LOUBERRIA DAM Louberria d
Page 141 and 142: Chapter V Some of these barrages, a
Page 143 and 144: Chapter V Fig. 8 - Dam with a tilti
Page 145 and 146: Chapter V BIBLIOGRAPHY 1 - Ministè
Page 147 and 148: M anagement of water quality EUTROP
Page 149 and 150: M anagement of water quality !"the
Page 151 and 152: M anagement of water quality Proces
Page 153 and 154: M anagement of water quality 148 Al
Page 155 and 156: M anagement of water quality While
Page 157 and 158: M anagement of water quality It con
Page 159 and 160: M anagement of water quality It sho
Page 161 and 162: M anagement of water quality These
Page 163 and 164: 4. Grégoire (A.), 1987- Caractéri
Page 165 and 166: L ife of the dam SPECIAL FEATURES O
Page 167 and 168: L ife of the dam GENERAL SURVEILLAN
Page 169 and 170: L ife of the dam ORGANISATION OF SU
Page 171 and 172: L ife of the dam During such period
Page 173 and 174: L ife of the dam MAINTENANCE 168 Th
Page 175 and 176: L ife of the dam BIBLIOGRAPHY 1 - C
Page 177 and 178: C onclusion FLOOD DATA It is fairly
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SMALL DAMS

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