SMALL DAMS PETITS BARRAGES

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2 Fig. 1.1 – Relationship H . V for small dams Using this relationship and related associated weighted breakdowns for risk to loss of lives, economy, environmental and social “damages” this small dams bulletin uses the following Potential Hazard Classification (PHC) system as shown in Table 1.1: Table 1.1 – Potential Hazard Classification (PHC). Component Potential Hazard Classification (PHC) Low – (I) Medium - (II) High - (III) 2 H . V parameter 2 H . V
2 Fig. 1.2 – Relationship H . V with the indication of the PHC – Potential Hazard Classification (Examples of small dams in Brazil, Spain and South Africa shown) 1.2 DEFINITION OF <strong>SMALL</strong> <strong>DAMS</strong> For this bulletin “Small Dams” are defined as having the following characteristics: 2 o 2,5 m < H < 15 m and H . V < 200 (*) o H is height in meters above river bed level to maximum crest level o V is storage volume in million m 3 at Maximum Operating Level = Full Supply Level in most cases. (*) Minimum dam height can be changed to 2 or 3 m in the case of dams in residential or very populated areas. Dams with 5 < H < 15 m and V > 3 hm 3 (million cubic meters) are classified as large dams according the ICOLD. For flood retention dams holding no water the storage volume at crest of spillway level (design storage volume) should be used. The classification of small dams as well as large dams is shown on Figure 1.3. 15
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: 1. SMALL DAMS DEFINITION AND CLASSI
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 and 28: The gabion dam as the gabion retain
Page 29 and 30: Some inflatable dams are operated b
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
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Thickness of pervious layer Thick D
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t 5.7.1.4 Practical Considerations
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It is generally accepted that cohes
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� Simple Bishop (1955) � Spence
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� The elements for surface draina
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The supporting layer for the rip-ra
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For very small reservoirs (fetch of
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The junction of the downstream slop
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Fig. 5.14 - Hongshiyan homogenous d
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material has been left in place or
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The homogeneous dam is recommended
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[3] OL and OH soils are not recomme
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part (core) lies in the zone (Fig.
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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
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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
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the others weir gauges need to be i
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� Earthquakes sensible at the dam
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APPENDIX INSPECTION CHECKLIST FOR S
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Exposed reinforcement � The condu
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These spillways can be lined or unl
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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
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Tube-a-manchettes injection system
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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
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Embankment dams that have properly
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and minimize erosion. Design of sui
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[20] SMEC- “Draft Guidelines for
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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)
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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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