SMALL DAMS PETITS BARRAGES

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3.3.2 Overtopping caused by flood 3.3.3 Internal erosion 3.3.4 Slope instability 3.4 References 4. LEGISLATION & DECOMMISSIONING 4.1 Introduction 4.2 The regulation 4.3 The supervising authority 4.4 The owner 4.5 Decommissioning 4.6 Conclusion 4.7 References 5. FEATURES OF THE DESIGN OF <strong>SMALL</strong> EMBANKMENT <strong>DAMS</strong> 5.1 Introduction 5.2 Design floods 5.3 Homogenous and zoned embankments design 5.3.1 Homogenous type 5.3.2 Zoned embankment type 5.4 Freeboard 5.4.1 Definitions of freeboard 5.4.2 Freeboard design considerations 5.4.3 Freeboard design for wave run-up and wind setup 5.4.4 First approximations for freeboard requirements 5.4.5 Camber 5.5 Soil compaction 5.5.1 Compaction standards 5.5.2 Water content variation and effect on geomechanical properties 5.5.3 Layer thicknesses 5.5.4 Quality control during compaction 8
5.5.5 Compaction in confined areas 5.5.6 Testing of the pipe 5.5.7 Compaction of filters 5.6 Dam foundation treatment 5.6.1 Foundation watertightness 5.6.2 Foundation drainage 5.7 Drainage system for earthfill dams 5.7.1 Seepage control measures 5.7.1.1 Measures for pervious ground 5.7.1.2 Blanket grouting method 5.7.1.3 Artificial blanket 5.7.1.4 Practical considerations 5.7.1.5 Filter material criteria 5.7.1.6 Piping prevention criteria 5.7.1.7 Criteria regarding permeability 5.7.1.8 Uniform criteria 5.7.1.9 Criteria for the inherent stability of a filter 5.7.1.10 Cohesion clay criteria 5.7.1.11 Criteria regarding dispersive clay 5.7.1.12 Organic material criteria 5.7.1.13 Criteria and practice regarding synthetic materials 5.8 Slope stability 5.8.1 Introduction 5.8.2 Critical cases for analysis 5.8.3 Limiting equilibrium methods 5.8.4 Minimum safety factors against slipe circle failures 5.9 Surface drainage 5.9.1 Principles 5.9.2 Possible mechanical solution of the surface dewatering 9
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: FOREWORD ACKNOWLEDGEMENT SUMMARY TA
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 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
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characteristic must be determined.
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5.6.1 Foundation Watertightness The
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� 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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