SMALL DAMS PETITS BARRAGES

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Destruction and Replacement New Pipe Installation PIPE BURSTING AND PIPE SPLITTING PIPE EATING HORIZONTAL DIRECTIONAL DRILLING MICRO- TUNNELING Conditions Pros Cons Comments shapes. varied using optional curing 3. Closed-circuit television techniques. inspection will be required immediately renovation. prior to 1. May be partially blocked; 1. It can replace existing pipe 1. This method must be This method is most useful for existing structural capacity with larger diameter pipe. modified by adding pipe increasing existing pipe should be less than the splitting techniques to repair diameters. If they are bursting forces. 2. Existing pipe is broken non-brittle pipe. deteriorated or not. Careful and left surrounding the new consideration should be taken pipeline. 2. This technique may not in determining if this technique burst reinforced or previously will be able to burst the existing repaired pipelines. pipe. 2. Common diameter is 305 mm (12 in.), yet up to 1 194 mm (47 in.) diameter is possible. 1. Useful for deteriorated and unreinforced clay, partially reinforced concrete, and highly deteriorated ductile iron pipe. 2. Any diameter. 1. Appropriate for flexible polymer pipe installation. 2. Useful for almost any diameter pipeline. 1. Appropriate for high compressive strength pipe 1. It allows for upsizing existing pipe diameters. 2. Existing [pipe materials are removed from the ground. 3. Realignment of the newly installed pipeline is possible. 1. Open trench and pit excavations may be eliminated altogether. 2. Flexible pipeline, drilling machine, and monitoring instruments allow for controlled direction and depth during installation. 1. It can perform installation of pipe at great 1. Only old clay pipe without reinforcing, asbestos concrete with or without mesh reinforcement and some highly deteriorated ductile iron pipe may be replaced. 2. Substantial insertion and extraction excavation will be required. 1. Some drilling machines require excavations to place the machine at the desired pipeline depth. 2. Only flexible pipes, such as polyethelene or steel, may be installed with this method. 1. Substantial excavations will be required for This technique is useful for eliminating the need for opentrench pipeline replacement for select existing pipe types. Where applicable, this technique can be very useful in upsizing and realigning a new pipeline. This technique is most useful for flexible-type pipe, which commonly is used for cable and electric lines. Gravity pipelines are less common, but are becoming more common with the use of direction and depth monitoring systems. This technique is useful for situations where open- 132
Conditions Pros Cons Comments types only, such as clay, reinforced fiberglass, and concrete pipes. 2. Useful for any diameter, 152 mm (6 in.) or greater. depths and tunnel through various soils and rock sizes. 2. Gradient and alignment of newly installed pipe is precisely controlled. insertion and extraction of the micro-tunneling machine. 2. Unexpected ground conditions can lead to a blocked machine, requiring an expensive removal. trench installation of pipe is not economical or possible. Also, it is very useful for installation of gravity pipelines that require strict control of gradient and direction. 133
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SMALL DAMS Design, Surveillance and
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FOREWORD The ICOLD - International
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ACKNOWLEDGEMENT The Ad Hoc Committe
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FOREWORD ACKNOWLEDGEMENT SUMMARY TA
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5.5.5 Compaction in confined areas
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7.2.1 Introduction 7.2.2 Spillway c
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1. SMALL DAMS DEFINITION AND CLASSI
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2 Fig. 1.2 - Relationship H . V wit
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1.3 REFERENCES [1] French Committe
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2.3 ZONED EARTHFILL DAMS In arid pa
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sloping core guarantees water impou
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Fig. 2.11 - Hlinky Concrete Gravity
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Fig. 2.13 - Photograph of Neusberg
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The gabion dam as the gabion retain
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Some inflatable dams are operated b
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3.1 INTRODUCTION 3. SAFETY OF SMALL
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Condition Effect on safety 13. Dama
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Fig. 3.2 - Massive dam break overto
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and suffusion or internal instabili
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downstream part of the embankment m
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small dam impounding a lot of water
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Whenever the Supervising Authority
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emergency management organizations
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c) The decommissioning plan should
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5.1 INTRODUCTION 5. FEATURES OF THE
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5.2 DESIGN FLOODS Inadequate flood
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downstream slope will show seepage
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Fig. 5.2 - Design Freeboard 5.4.3 F
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2 U f Fe S 1400 D Where Uf is the d
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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
Page 81 and 82: The junction of the downstream slop
Page 83 and 84: Fig. 5.14 - Hongshiyan homogenous d
Page 85 and 86: 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
Page 91 and 92: part (core) lies in the zone (Fig.
Page 93 and 94: 6. GUIDELINES ON SURVEILLANCE OF SM
Page 95 and 96: cases the owner may retain the serv
Page 97 and 98: Surface displacement on an embankme
Page 99 and 100: Fig. 6.1 - Leakage measurement usin
Page 101 and 102: Water Level Sounder - Details of th
Page 103 and 104: pressure) Left abutment 2 5 Weir ga
Page 105 and 106: 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
Page 113 and 114: 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
Page 119 and 120: Fig. 7.3 - Installation of the arti
Page 121 and 122: Fig. 7.7 - Dam overtopping protecti
Page 123 and 124: complete construction was in 2001,
Page 125 and 126: 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
Page 131: Pipe Rehabilitation SLIPLINING MODI
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
Page 143 and 144: Fig. 8.1 - Three small dams in casc
Page 145 and 146: 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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