This book addresses current international practices applied for dam safety assessments by looking at a portfolio of dam safety projects in various developing countries (Armenia, Georgia, Tajikistan, Mauritius, Madagascar, Sri Lanka, Myanmar and Vietnam) spread across three continents (Europe, Africa and Asia). Safety assessment involved the review of 134 existing dams and comparison with the best international practices. A large part of dam safety assessment involves understanding of dam hazards, standards applied in the design and maintenance, as well as expectation and social circumstances under which the dams have been designed and constructed in a particular country. For example, standards for design floods, ground investigation, selection of design soil parameters and design earthquakes etc. used are often either non-existent or inadequate, which could lead to an unsafe design. If there are no standards to be applied in dam design and construction, consultants are often under pressure from clients to come up with minimalistic investigation and designs, which, after a few years after dam construction, show signs of deficiencies. Very often countries have no regulations and standards for requirements that should cover the maintenance and operation of dams.
The book also describes the Portfolio Risk Assessment of Dams, which can be used as a tool by clients and the funding agencies to identify priority assessment and rehabilitation projects that consider societal and economic losses. It also demonstrates how the implementation of Emergency Preparedness Planning could significantly
reduce the number of people at risk.
This book aims to help clients, consultants and funding agencies which are engaged in dam safety assessment projects in developing countries to focus on issues that are based on past lessons learnt.
Author(s): Ljiljana Spasić-Gril
Publisher: CRC Press/Balkema
Year: 2022
Language: English
Pages: 174
City: Leiden
Cover
Half Title
Title Page
Copyright Page
Dedication
Table of Contents
Preface
Acknowledgements
List of abbreviations
About the author
1 Introduction
1.1 Background on dam safety
1.2 This book
Note
2 Main aspects in dam safety assessment and principles and concepts applied
2.1 Data collection and assimilation
2.2 Approach to dam safety evaluation
2.2.1 Information on dam design life
2.2.2 Safety criteria for assessment of the design life of dams
2.2.3 Dam risk classification
2.2.4 Potential failure modes
2.3 Site inspection
2.4 Safety evaluation of design, construction, and operation
2.4.1 Hydrology, flood routing, design, and safety check floods
2.4.2 Dam breach assessment
2.4.3 Sedimentation
2.4.4 Geological, geotechnical, geotechnical, and geophysical conditions
2.4.5 Seismicity
2.4.6 Reservoir basin
2.4.7 Dam body
2.4.8 Overflow spillway
2.4.9 Outlet works
2.4.10 Review of instrumentation, operation and maintenance and emergency preparedness plans
Notes
3 Case studies: Eurasia/Western Asia – Armenia
3.1 About the country
3.2 About the dams
3.3 Dam safety projects II
3.3.1 Scope of the project
3.3.2 Field investigations
3.3.3 Studies
3.3.4 Typical deficiencies and structural rehabilitation works proposed for existing dams in operation
3.3.5 Specific dam safety issues related to the Marmarik dam
3.3.6 Portfolio risk assessment
3.3.7 Dam safety plans
3.4 Conclusions and challenges
Notes
4 Case studies: Eurasia/Western Asia – Georgia
4.1 About the country
4.2 About the dams
4.3 Irrigation and drainage community development project - dam safety action plan
4.3.1 Scope of the project
4.3.2 Field investigations
4.3.3 Studies
4.3.4 Typical deficiencies and rehabilitation works proposed for four dams
4.3.5 Safety aspects of the Rioni diversion weir
4.3.6 Risk assessment
4.3.7 Dam safety plans
4.4 Conclusions and challenges
Notes
5 Case study: Central Asia – Tajikistan
5.1 About the country
5.2 About the dams
5.3 Nurek dam
5.3.1 Background
5.3.2 Main project features
5.3.3 Dam safety and reservoir management project and Nurek HPP rehabilitation project
5.4 Usoy dam and Lake Sarez
5.4.1 Introduction
5.4.2 Risks
5.4.3 Lake Sarez risk mitigation project
5.5 Conclusions and challenges
Notes
6 Case study: South Asia – Sri Lanka
6.1 About the country
6.2 About the dams
6.3 Dam safety and reservoir conservation project
6.3.1 Project background
6.3.2 Profile of dams
6.3.3 Inspections and condition of dams
6.3.4 Operation and maintenance (O&M)
6.3.5 Emergency preparedness
6.3.6 Reservoir conservation
6.3.7 Dam safety legislation
6.3.8 Portfolio risk assessment
6.4 Conclusions and challenges
Notes
7 Case studies: South East Asia – Myanmar
7.1 About the country
7.2 About the dams
7.3 Dam safety assessment of five large irrigation dams
7.3.1 Background
7.3.2 Main features of the dams
7.3.3 Issues arising from site visits and dam safety reviews
7.3.4 Recommendations in the interest of safety
7.4 Conclusions and challenges
Notes
8 Case studies: Southeast Asia – Vietnam
8.1 About the country
8.2 About dams
8.3 Dam rehabilitation and safety improvement project
8.3.1 Project background
8.3.2 Dam classification, design and safety check floods
8.3.3 Reservoir sedimentation
8.3.4 Spillway capacity and safety against overtopping
8.3.5 Seepage through the embankment
8.3.6 Erosion of slopes due to dispersive soil properties
8.3.7 Upstream slope protection
8.3.8 Seismic stability of dams
8.3.9 Monitoring of dams
8.3.10 Capacity of local consultants
8.4 Conclusions and challenges
Notes
9 Case studies: East Africa – Mauritius
9.1 About the country
9.2 About dams
9.3 La Ferme dam rehabilitation project
9.3.1 Project background
9.3.2 Description of the dam
9.3.3 Summary of findings based on dam safety assessment
9.3.4 Proposed rehabilitation works
9.4 Conclusions and challenges
Notes
10 Case studies: East Africa – Madagascar
10.1 About the country
10.2 About dams
10.3 Emergency project for food security and social protection
10.3.1 Project background
10.3.2 Main features of dams
10.3.3 Main findings from dams’ inspections
10.3.4 Dams safety assessemnt
10.3.5 Summary of findings and further work recommended in the interest of safety
10.4 Conclusions and challenges
11 Lessons learnt and recommendations
11.1 Summary on the countries
11.2 Technical assessments
11.3 Political and social elements
Index
