SMALL DAMS PETITS BARRAGES

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Country Year Introduced Type of inflation Number Installed World (Area ft²) ¹ USA 1956 Air & Water - Japan 1968/1978 Air & Water or Air 1,900 France 1972 Water 25 Austria 1977 Water 60 Japan 1978 Air or Water > 700 (302,000) Germany 1984 Air or Water 40 USA 1988 Air 111 Australia 1997 Air or Water 3 Czech Republic 1980 Water 20 Some Rubber dams consist of a sealed rubber tube fabricated from a heavy – duty,nylon – reinforced rubber attached to a reinforced concrete foundation with metal clamping lines (Fig. 2.17). The rubber body is inflated with air or water to impound water. The reinforced rubber material used for the dam body is sometimes similar to that used for conveyor belts, tires for heavy construction equipment, and tires for aircraft (Fig. 2.18). Fig. 2.17 – Schematic view of a Rubber Dam – Courtesy of Bridgestone [3] 28
Some inflatable dams are operated by low-pressure air, typically between 2 and 10 psi. Fig. 2.18 – Photo of an inflatable dam at Sunbury, PA, USA [3] Fig. 18a – Inflatable Small Dam, Mlada Boleslav, Czech Republic Some hydro gate system is similar to a hydraulically operated steel bascule dam, except instead of hydraulically operated piston controls, the hinged metal panels are raised and lowered using inflatable rubber bladders. The Obermeyer Hydro Gate System consists of a row of bottom hinged steel gate panels supported on their downstream side by inflatable air bladders (Fig. 2.19) 29
Page 1 and 2: SMALL DAMS Design, Surveillance and
Page 3 and 4: FOREWORD The ICOLD - International
Page 5 and 6: ACKNOWLEDGEMENT The Ad Hoc Committe
Page 7 and 8: FOREWORD ACKNOWLEDGEMENT SUMMARY TA
Page 9 and 10: 5.5.5 Compaction in confined areas
Page 11 and 12: 7.2.1 Introduction 7.2.2 Spillway c
Page 13 and 14: 1. SMALL DAMS DEFINITION AND CLASSI
Page 15 and 16: 2 Fig. 1.2 - Relationship H . V wit
Page 17 and 18: 1.3 REFERENCES [1] French Committe
Page 19 and 20: 2.3 ZONED EARTHFILL DAMS In arid pa
Page 21 and 22: sloping core guarantees water impou
Page 23 and 24: Fig. 2.11 - Hlinky Concrete Gravity
Page 25 and 26: Fig. 2.13 - Photograph of Neusberg
Page 27: The gabion dam as the gabion retain
Page 31 and 32: 3.1 INTRODUCTION 3. SAFETY OF SMALL
Page 33 and 34: Condition Effect on safety 13. Dama
Page 35 and 36: Fig. 3.2 - Massive dam break overto
Page 37 and 38: and suffusion or internal instabili
Page 39 and 40: downstream part of the embankment m
Page 41 and 42: small dam impounding a lot of water
Page 43 and 44: Whenever the Supervising Authority
Page 45 and 46: emergency management organizations
Page 47 and 48: c) The decommissioning plan should
Page 49 and 50: 5.1 INTRODUCTION 5. FEATURES OF THE
Page 51 and 52: 5.2 DESIGN FLOODS Inadequate flood
Page 53 and 54: downstream slope will show seepage
Page 55 and 56: Fig. 5.2 - Design Freeboard 5.4.3 F
Page 57 and 58: 2 U f Fe S 1400 D Where Uf is the d
Page 59 and 60: Maximum compaction is obtained at c
Page 61 and 62: characteristic must be determined.
Page 63 and 64: 5.6.1 Foundation Watertightness The
Page 65 and 66: � A continuous vertical chimney d
Page 67 and 68: Thickness of pervious layer Thick D
Page 69 and 70: t 5.7.1.4 Practical Considerations
Page 71 and 72: It is generally accepted that cohes
Page 73 and 74: � Simple Bishop (1955) � Spence
Page 75 and 76: � The elements for surface draina
Page 77 and 78: The supporting layer for the rip-ra
Page 79 and 80:
For very small reservoirs (fetch of
Page 81 and 82:
The junction of the downstream slop
Page 83 and 84:
Fig. 5.14 - Hongshiyan homogenous d
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material has been left in place or
Page 87 and 88:
The homogeneous dam is recommended
Page 89 and 90:
[3] OL and OH soils are not recomme
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part (core) lies in the zone (Fig.
Page 93 and 94:
6. GUIDELINES ON SURVEILLANCE OF SM
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cases the owner may retain the serv
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Surface displacement on an embankme
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Fig. 6.1 - Leakage measurement usin
Page 101 and 102:
Water Level Sounder - Details of th
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pressure) Left abutment 2 5 Weir ga
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Fig. 6.9 - Recommended standpipe pi
Page 107 and 108:
the others weir gauges need to be i
Page 109 and 110:
� Earthquakes sensible at the dam
Page 111 and 112:
APPENDIX INSPECTION CHECKLIST FOR S
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Exposed reinforcement � The condu
Page 115 and 116:
These spillways can be lined or unl
Page 117 and 118:
flowing water. Flowing water with h
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Fig. 7.3 - Installation of the arti
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Fig. 7.7 - Dam overtopping protecti
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complete construction was in 2001,
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In some cases, the downstream face
Page 127 and 128:
Tube-a-manchettes injection system
Page 129 and 130:
7.3.5 Slope Protection Measures 7.3
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Pipe Rehabilitation SLIPLINING MODI
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Conditions Pros Cons Comments types
Page 135 and 136:
Embankment dams that have properly
Page 137 and 138:
and minimize erosion. Design of sui
Page 139 and 140:
[20] SMEC- “Draft Guidelines for
Page 141 and 142:
present visual information. It must
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Fig. 8.1 - Three small dams in casc
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Social Disruption low (rural area)
Page 147 and 148:
Fig. 8.4 - Flood water level after
Page 149:
8.9 REFERENCES [1] BURREC (1994) -
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SMALL DAMS PETITS BARRAGES

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