icold technical committee on levees (le tc)

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ICOLD Technical Committee on Levees (LE TC)

Workshop, 1st part, Monday 10 June Morning Dams-Levees Comparison

Welcome - Introduction

•  LE TC has been established in Prague 2017 ICOLD meeting •  Its final terms of reference have been approved in 2018, including:

1)  Collect information on levees such as characteristics, policies and best practices for design, construction, operation, maintenance and ongoing management in different countries

2)  Explore similarities and differences between dams and levees 3)  Collaborate with other ICOLD Technical Committees on levee-related topics,

possibly to extend their publications to include levees as well as dams 4)  Explore the potential for combining dam and levee safety approaches in

various regulatory, and physical environments 5)  Work towards best practices on levee systems and combined dam/levee

systems 6)  Present levee related issues in a position paper 7)  Develop opportunities for capacity building and research on levees

ICOLD LE TC Workshop on dams-levees comparison # 2

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Overview of the program of the two days

• Monday 10 June morning (now): workshop on dams-levees comparison

• Monday 10 June afternoon: •  presentations based workshop •  + interactive sequence on risk informed levee design

• Tuesday 11 June - TC meeting •  Share and discuss progress on the objectives and deliverables of the TC •  Levees situation report •  Various topics (see agenda) •  LFD WG meeting


Message from the organization committee

• You should go to the breaks and lunches in the building where we are attending the workshop and or committee meeting.

• There will NOT be one central break/lunch on Monday and Tuesday.


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Dams-levees comparison report

• The dams-levees comparison report is one of the two main deliverables of our TC, with the levee situation report.

•  It will help to identify technical issues where collaboration with other TCs is interesting/essential (dams-levees similarities) and where specific issues could be later tackled by our TC or new TCs.

• Together they will help us prepare a position paper, to be presented in ICOLD 2021 Marseille congress. The aim of this position paper will be to demonstrate that levees have permanent added value for the ICOLD-community as a whole.


Dams-levees comparison report - History

• This report was one of the initial objectives of the EUCOLD LFD WG

•  It was the topic of different workshops: Lelystad (2017), Aix en Provence (2018 – only partially) and Paris (2019). The Paris meeting incorporated all ‘post it note’ ideas assembled during a half day workshop at the Vienna congress.

• The outcome is a scoping document (disseminated): 2019 04 18 Scoping Document - Dams Levees Comparison Report and a detailed outline with content.


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Dams-levees comparison workshop

• Appointment of a session secretary (or more…)

• Quick self-introductions: briefly state your: •  name, •  country, •  affiliation, •  membership status (ICOLD LE TC, EUCOLD LFD WG, none)

• Attendance list: to be signed / completed


Dams-levees comparison report content •  Preface + Summary / Résumé •  Chapter 1: Introduction, aim, scope •  Chapter 2: General features, functions and forms of dams and levees •  Chapter 3: Dams and levees in flood risk management (FRM) •  Chapter 4: Governance •  Chapter 5: Design •  Chapter 6: Construction •  Chapter 7: Operation •  Chapter 8: Inspection, monitoring, assessments and maintenance •  Chapter 9: Emergency management •  Chapter 10: Conclusions and recommendations

•  Draft document (detailed outline with some content): 2019 04 23 Dams Levees Compar Report Draft Structure.doc


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Dams-levees comparison report work organisation

• Different roles: •  Leads for the report: Jonathan Simm + Rémy Tourment •  Chapter Leads / Section leads •  Writing (Chapters / sections) •  Contributing •  Reviewing (Chapters / sections) •  National point of contact •  Point of contact with another TC


Dams-levees comparison report work organisation

•  At the moment we are still missing : •  Leads for two chapters (6 Construction and 9 Emergency management) •  More section leads (not mandatory) •  More writers / contributers / reviewers •  Points of contact (national / TCs) •  See spreadsheet “Dams-Levees comparison Tasks”

•  The report has to be produced using the ICOLD Bulletin template •  Each chapter will now be developed in a separate file. •  Ideas presented in the draft outline now have to be further developed.


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Draft chapters

• Draft chapters: •  Are available on the TC shared web space •  Are shared by email among the Chapter teams

• Some draft chapters (and other contributions) were received too late before this Ottawa ICOLD meeting (initial deadline 29 May) to be disseminated to the whole TC, they will be disseminated soon. Thanks anyway to contributors.


Key points about this report

• The aim of this report is to illustrate the existing similarities and differences between dams and levees, in that way helping to illustrate joint lessons that can be drawn by considering both dams and levees, and to illustrate the added value of levee-related knowledge to the dam community, and vice versa.

• The intention is to be relatively (though not entirely) complete regarding topics, but not regarding detail ! The intended level of detail should be just enough to illustrate and discuss dam-levee similarities and differences, and the report should refer to background literature for further detail. Also, the report will focus on commonly occurring situations, rather than the numerous exceptions that also exist.


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Chapter 1 (Leads Jonathan / Rémy)

• Chapter 1: Introduction, aim, scope •  1.1 Aim and scope of the report •  1.2 Introduction to and outline of the report

• This chapter has to be actually drafted / written, but the ideas that need to be put into it are now quite clear (as can be seen in draft outline)

• Writing it can start now, but it may be better to finalize it after Ch 2-9 are more advanced, to take into account possible changes.


Chapter 2 (Lead Rémy)

• Chapter 2: General features, functions and forms of dams and levees

• 2.1 Key definitions • 2.2 Functions of dams, levees and related structures • 2.3 Dams and levees types. Structural components. • 2.4 Components and functions of dams and levees • 2.5 Failure mechanisms


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Chapter 2

• There has been some development of the content of this chapter since the draft outline of the report but it is far from finished

• This chapter will use many illustrations • Help is needed to share the work, but also to help me keep

momentum : Volunteers to help write / contribute / review chapter or sections?

• A lot of concepts in this chapter are shared with many other chapters. So, it would be useful to share this chapter as soon as possible with other chapters.


Chapter 2

• Objects are described through a hierarchy: •  (water/river basin) system => structure => component

map/hydraulic & cross section/structural


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Chapter 2

• Some issues:

• Many definitions for dams and levees, not always consistent, not always discriminating

• Key definitions before functions? Should not definitions include the function?


Chapter 2

• Key messages to other chapters: • There are many other types(or sub-types) of hydraulic

structures, similar to dams/levees, and the similarities and mainly the differences are not always between these “black and white” categories. This needs to be kept in mind while writing the different chapters.

• Consider also the various environments (rivers, sea, torrents, lakes, estuaries, …)


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Chapter 3 (Lead Marcel Bottema)

• Chapter 3: Dams and levees in flood risk management (FRM)


TCLE Dam-levee report; progress Chapter 3

• Chapter 3: Dams and levees in Flood Risk Management (FRM) •  Status as of May 2019:

•  Draft of full chapter finished; illustrations still to be improved •  Chapter leader: - •  Main author: Marcel Bottema •  Reviewer: -


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TCLE - Dams and levees in FRM (ch3)

• Chapter structure: •  3.1: Definition of Flood Risk Management (FRM) •  3.2: Role of dams and levees in river basins and FRM •  3.3: FRM-related similarities and differences between dams and levees •  3.4: Dams and levees in FRM context – Lessons and recommendations •  3.5: References



•  3.1 - Definitions: •  General definitions to be included in the Glossary of Chapter 2

•  Perhaps to be discussed: the level of detail/completeness of the glossary (during the TC meeting)

•  Section 3.1 serves to discuss and define the concept of FRM (Flood Risk Management) :

•  General principle: adopt ICOLD definition, or Int. Levee Handbook if more appropriate •  However ICOLD provides no definition and the ILH only a description. Other definitions focus

on FRM-implementation choices rather than FRM itself. •  Therefore, it is proposed to adopt the definition of www.floodsite.net

•  FRM / Flood Risk Management is the holistic and continuous societal analysis, assessment and reduction of flood risk.

•  This can be supplemented by the ICOLD Risk Management definition: Risk Management is the systematic application of management policies, procedures and practices to the tasks of identifying, analyzing, assessing, mitigating and monitoring risk.

•  Need definitions of risk (not always understood consistently by different people) and its components (different decompositions)


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• 3.2 – Role of dams and levees in river basins and FRM •  General approach: To investigate similarities and differences between

levees and dams, first their role within river basins and various FRM-related conceptual frameworks should be considered.

•  This leads to four different perspectives: •  Geographical and river basin context •  Source-pathway-receptor framework •  Safety chain framework •  Type of measure (structural, non-structural)



• 3.2 – Dams levees and river basins •  Rough characteristic… •  Upstream mountains: hydropower dams •  Upstream city: flood management & water

supply dams; urban levees •  Middle course: Multipurpose dams

(hydropower, water supply, navigation, ..) •  Levees along lowland river (both along cities

and farmlands) •  Estuary dam to protect Delta City against storm

surges (with both upstream and coastal levees)

•  Note: Upstream flood management ideally should match with downstream flood protection..


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•  3.2 – Three further perspectives on dams & levees within FRM

•  Source-pathway-receptor •  Source: hydraulic or other loading (rain, high water level.discharge, waves, earthquake) •  Pathway: often a barrier between source and receptor •  Receptor: people, property, environment

•  Safety chain

•  Type of measure •  structural measure (dam, levee, ..) •  Non-structural measure (warning, evacuation, spatial planning, insurance, incentives, ..)

Emergency action Preparedness

Prevention (protect)

Proaction (avoid)

Recovery (& learning)



•  3.3 – FRM-related similarities and differences between levees and dams: •  Similarities

•  Both have a key role in FRM •  Both are structural measures, often near concentrations of people and/or assets •  Both have to provide a significant amount of protection, but their protection is only up to a certain level

•  Differences •  Unlike levees, dams often have river regulating functions •  Dams are more often newly/purposely designed structures (and levees historically developed) •  (hydropower) dams may also be constructed in relatively remote areas •  In terms of efficiency for a range of flood probability •  River / Marine / other environments

•  And many cases with both similarities and differences… •  In terms of safety chain, source-receptor-pathway concept, the function of containing or retaining water, the type of

design flood, … •  Both dams and levees can be multipurpose, but the unlike dams, the primary function of levees is rarely unrelated

to FRM. •  Impact of failure: can be huge for both levees and dams, but is perhaps less direct and less predictable for dams

due to cascade effects affecting downstream dams and levees


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• 3.4 - Recommendations: •  Explore the FRM-related role of dams and levees in a separate publication.

•  Maybe even work towards guidance that indicates in what situation levees are the most promising FRM-option, and in what situation dams?

•  Work towards integrated safety approaches considering both dams and levees in a river basin

•  Knowledge about cascade effects of dam and levees failures is also desirable. •  Background: required safety levees for downstream urban levees tend to increase beyond the

protection levels that can be assured by the operation/storage of upstream dams. •  Check the ILH and ICOLD Bulletins for mutual inconsistencies in FRM-related definitions

and classifications, to avoid misunderstandings and facilitate an integrated approach.



• 3.5 - References: •  Int. Levee Handbook, ICOLD Bulletins 31, 125, 131, 142, 156, 170 and a

few other references •  To be discussed:

•  Any essential reference missing? •  In terms of format:

•  Section at end of each chapter? •  Or a separate Reference section at the end of the report? (in alphabetical order or

organized by chapter ?)


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• How to move on with Chapter 3 (Dams, levees and FRM)? •  Illustrations must be replaced by tailor-made ones free of copyright; who

can help? •  Who can help with (review and/or) upgrading the draft to a final draft? •  General TCLE feedback

•  Can we move on using the present draft? •  Is anything essential missing?


Chapter 4 (Lead Adrian Rushworth)

• Chapter 4: Governance

• 4.1 Roles and responsibilities • 4.2 Ownership and management • 4.3 Funding • 4.4 Regulation(s) • 4.5 Stakeholder involvement


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Chapter 4: Governance

• 4.1 Roles and responsibilities • 4.2 Ownership and management • 4.3 Funding • 4.4 Regulation(s) • 4.5 Stakeholder involvement

Chapter 4 roles

Role Name Lead Adrian Rushworth Write Meindert Van Contribute Johnny Lyttle

Review Christian Holzgang

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Current position

1.  Outline content 2.  Suggestions and comments from Vienna 2018 3.  Issues

•  Lack of information •  Practice varies between countries.

Possible content

4.1: Consider State (both Ministries and executive bodies), Local/Regional Authorities, Owners/Managers, Engineering companies, and Regulatory Enforcement, Construction (Contractor / Control) 4.2: Ownership/management may be function/country/situation dependent 4.3: Funding: public/private/joint? For building/operation/maintenance 4.4: Regulation: European/National/Local. Depending on country / object/function(s). Relates to Safety standard, Design, Maintenance, Management, .. Levee inventory report points at some marked differences between levees and dams. 4.5: About role/objectives and position/involvement of stakeholders

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Feedback

• Questionnaire • Sources of information / other consultees to consult

Links to other chapters

Like for Chapter 2, a lot of concepts in this chapter are used in other chapters. So, it would be useful to share this chapter as soon as possible with other chapters. Chapter 5: Design o 5.1 Safety standards and overall safety approach (deterministic, risk-based, ..) o 5.2 Actions and loadings o 5.3 Design to prevent the different deterioration /damage mechanisms Chapter 6: Construction Chapter 7: Operation Chapter 8: Inspection, monitoring, assessments and maintenance o 8.1 Inspection and monitoring o 8.2 Assessments, investigations and risk-informed approaches o 8.3 Maintenance Chapter 9: Emergency management o 9.1 Examples of actual failures of dams and levees o 9.2 Emergency management

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Chapter 5 (Leads David Bouma + Meindert Van)

• Chapter 5: Design

• 5.1 Safety standards and overall safety approach (deterministic, risk-based, ..)

• 5.2 Actions and loadings • 5.3 Design to prevent the different deterioration /damage

mechanisms


Dam-Levee-Intercomparison Report – Chapter 5 - Design

• Outline structure and content circulated 2 June – for discussion and further development this week:

Chapter 5: Design •  5.1 Safety standards and overall safety approach •  5.2 Site characterisation •  5.3 Design loadings •  5.4 Design to prevent the different deterioration /damage mechanisms •  5.5 Other design issues: •  5.6 Design guidance references •  5.7 Historic design practices •  5.8 Summary


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• Tabular format suggested for this section – for discussion



Volunteers needed please for writing, contribution and review roles……


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• Key issues •  Lining up the team – contributors / reviewers needed •  Other sources of information / review - suggestions please •  Communication links to be established within Ch 5 team – this week •  Level of detail? This is a huge topic! Need to keep text concise and

focus on comparison – we are not writing a design text! •  Programme for writing, review etc to be confirmed



•  Potential links with other ICOLD TCs? Most of them! •  A Computational aspects of analysis and design of dams – Ch 5.2, 5.4 •  B Seismic – Ch 5.2, 5.3, 5.4 •  C Hydraulics - Ch 5.2, 5.3, 5.4 •  D Concrete Dams – link with flood walls - Ch 5.3, 5.4 •  E Embankment dams - Ch 5.2, 5.3, 5.4 •  F Engineering / planning for water resources projects – 5.1, 5.2, 5.3 •  G Environment - 5.1 – 5.5 •  H Dam safety – 5.1 •  I Public Safety – 5.1 •  J Sedimentation of reservoirs – 5.2 – 5.5 •  M Operation, Maintenance and Rehab – 5.5 •  P Cemented materials in dams – 5.2-5.4 •  S Flood evaluation and dam safety – 5.2 – 5.5 •  T – Prospective new challenges – maybe •  U – Dams and river basin management – 5.5 – 5.5 •  V – Hydromechanical equipment – in some case – 5.3 – 5.5 •  W – Selection of dam type – 5.2 – 5.4 •  Y – Climate change – 5.2 - 5.5 •  Plus ICOLD bulletins will feature prominently in Ch 5.6 •  Probably not K, L, N, O, Q, RE, X and Z

•  Timing for connecting with other TCs – perhaps after first draft developed? ICOLD LE TC Workshop on dams-levees comparison # 42

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Chapter 6 (Lead ???)

• Chapter 6: Construction

•  No defined outline for this chapter at the moment

• Two pages of text


Chapter 6 - Construction (Lead ???)

•  Sources •  For levees: ILH Chap 10 •  For dams: is there a similar (comprehensive) reference? What are the possible sources?

•  Malcolm Corlett (UK) via Jonathan Simm •  A contribution by Amir Farid Mojtahedi


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Some key issues for Chapter 6 construction

•  ICOLD Bulletins 73 and 78 •  Similarities

•  Geotechnical structures with foundation challenges •  Earthworks, similar plant •  Access challenges for both: but remoteness vs “long and thin” site issue

•  Key differences: dam vs levee •  Foundation – mountainous vs alluvial •  Structural complexity vs linear diversity •  Rates of placement and sampling & testing •  Bulk placement vs trimming of slopes •  Stakeholder complexity (higher with levees) •  New vs modification works •  Cofferdams vs temporary surface protection


Chapter 6 (Lead ???)

•  Issues and questions •  Limit between design and construction sometimes unclear (need good information / coordination between chapters 5 & 6 teams)

•  Embankment dams and levees only? •  What about components? (filters, revetments, geosynthetics, pipes, spillways, …)


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Chapter 7 (Lead Malcolm Barker)

• Chapter 7: Operation

•  In the draft detailed outline, there is no outline for this chapter, one page of ideas


Chapter Summary Maintenance is discussed in Chapter 8, Emergency management in Chapter 9. Define Operation for Levees and Dams Common features •  Passive operation (Dam or Levee) and Active operation (gates, sluices, valves, pumps)

management •  Operational procedures must comply with many standards and regulations set by the

owner, state or local governments. •  Safety of the structure •  Operational requirements determined from risk and operational life •  Surveillance required for active operation including visual inspections •  Instrumentation operation and surveillance required for performance review and “safety” Differences •  Dams include the quality of the water, the safety of the employees, etc •  Dams keep water in and levees keep water out


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Operation Definition

Levee Operation - International Levee Handbook •  “Day to day activities for flood defences management, excluding

maintenance •  Passive (embankment) and Active (gates, sluices, valves, pumps)

management Dam Operation •  Passive (Dam) and Active (gates, sluices, valves, pumps) management •  The Dam operation includes normal, flood and emergency conditions. •  Operational procedures must comply with many standards and regulations

set by the owner, state or local governments. These regulations cover a range of issues such as the safety of the Dam, the quality of the water, the safety of the employees, etc


Design Requirements for Operation

Dams •  Life • Hazard or Consequence Category •  Fallback or risk based flood capacity for “safe” operation using

spillways (gates, fuse plugs, uncontrolled) and outlet works •  Environmental release •  Fish, turtle, eel or other fauna passage Levees •  Life • Hazard or Consequence Category •  Fallback or risk based flood capacity for “safe” operation


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Function and implications for operation Dam •  Retain water for long periods (apart from detention basins) •  Flood retention (Active and Passive) •  Water Supply •  Hydropower •  Water transfer •  Environmental enhancement •  Aquifer recharge •  Design life implications for the dam

Levee •  Keep water out of a leveed area (Restrain water for limited time; some permanent retention) •  Get water out of a leveed area should it be inundated •  Keep the levee resilient during flood and storm events •  Design life implications for the levee


Operating Rules ü The operational rules for the system as a whole ü Operational rules for each individual regulated structure that forms part of the integrated system fro both

dams and levees Dams •  Purpose - Required to prevent failure scenarios release of water from the reservoir •  Pumps/turbines •  Spillway gate operation •  Outlet works •  Fuse plugs Levees •  Purpose - Required to prevent failure scenarios – release of water into the levee area or into the river •  Pumps •  Gates •  Spillways •  Breach sections


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Operation Plan Normal operating procedures and rules Contingency and emergency action plans including operating procedures designed to avoid and/or minimise environmental impacts including threats to human life resulting from any overtopping or loss of structural integrity of the regulated structure A plan for the decommissioning and rehabilitation of the regulated structure at the end of its operational life – Dams – Yes but is there such a thing for a levee?


Operation Plan Dams • Operation and Maintenance Plan • Operational plan" for a dam means a document that amongst

other things sets out procedures and criteria to be used for operating a dam during a particular time period.


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Operation Plan Levees? •  Operation plan for structures in the levee •  A permanent levee system requires minimal operational activity to provide

protection during a flood, provided it has been managed to ensure its level of service is consistently maintained. It is technically the most reliable protection system as it is always in place to offer flood protection up to its design standard.

•  There are no day-to-day activities required on levee systems except during flood events. Depending on the levee element or component, inspections, maintenance works and defect rectification should be scheduled once or several times per year based on the risk profile of the asset or in response to unsolicited reports. Regular inspections and maintenance work should ensure that all components of the levee system are in working order and that there are no fences, gates, trees and building encroachments that would prevent emergency vehicle access on or alongside the levee or compromise levee operation and safety.

•  Prior to the arrival of floodwaters Visual inspection of the levee to ensure it is operational and to identify any potential weaknesses or operational constraints.


Keeping water out

Dams •  Bypass channels

Levees • Mechanisms to close off during high water periods

•  Stop logs •  Flap gates •  Slide gates •  Flood gates •  Demountable structures •  Sandbags


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Linking Maintenance and Operation

The description of operational inspection and maintenance tasks to be undertaken by the owner/manager’s staff once or several times per year over the life of the asset should cover at least: • Regular maintenance for each defined component of the levee

system (e.g. mowing of batters, removal of weeds and debris, cleaning and checking operational readiness of connected assets, such as pumps, drainage systems, drop logs, gates, valves)


Discussion Points

What is done internationally for: • Passive Operation

• Active Operation


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Chapter 8 – Inspection, monitoring, assessments and maintenance (Lead: Scott Rashke)

• 8.1 Inspection and monitoring • 8.2 Assessments and investigations (traditional and risk-

informed approaches) • 8.3 Maintenance

Chapter 8 – Inspection, monitoring, assessments and maintenance – ORGANIZATION OF TEAM

• Need to identify (need updated information from RT 4/18 request to LE TC):

•  non-US authors/contributors •  Subject Matter Experts (SMEs) with extensive experience in dams/

levees

Lead Write Contribute ReviewChapter 8: Inspection, monitoring, assessments and maintenanceScott Raschke US NBG Malcom Barker

Jay Stateler (ex-USBR)George Sills (ex-USACE)John Cyganiewicz (ex-USBR)Graham Bradner (GEI)USACE (various)

Amir Farid MojtahediDavid Bouma

8.1 Inspection and monitoring Scott Raschke Aurélie Garandet8.2 Assessments, investigations and risk-informed approaches Rémy Tourment8.3 Maintenance Scott Raschke Aurélie Garandet

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Chapter 8 – Inspection, monitoring, assessments and maintenance – KEY ISSUES

A focus on summary of differentiators and why these exist (dams vs. levees, not just summary for dams and levees):

•  Fundamental Methodologies / Types •  Technology Applications •  Approach based on system / structural

differences (what are key differentiators) •  Outcome / Purpose (Use Case) – Life

Cycle Mgt of Asset

Chapter 8 – Inspection, monitoring, assessments and maintenance – POTENTIAL SOURCES

•  ICOLD Technical Bulletins •  US Society on Dams (USSD) White

Papers •  US Association of State Dam Safety

Officials (ASDSO) •  Training Materials / Ref Materials

•  Agency Practice •  US Army Corps of Engineers, •  US Bureau of Reclamation

•  International Levee Handbook •  Need additional suggestions, particularly

as it relates to non-US information

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Chapter 8 – Inspection, monitoring, assessments and maintenance – CROSS-CUTTING ISSUES

Chapter 1: Introduction, aim, scope Chapter 2: General features, functions and forms of dams and levees

Chapter 3: Dams and levees in flood risk management (FRM)

Chapter 4: GovernanceChapter 5: Design Chapter 6: ConstructionChapter 7: OperationChapter 8: Inspection, monitoring, assessments and maintenanceChapter 9: Emergency managementChapter 10: Conclusions and recommendations

•  As with the ILH, there will be many cross-cutting issues across the chapters

•  Will be a need to identify and cross-reference accordingly

•  Will require a fairly complete working draft to reference specific content

Chapter 8 – Inspection, monitoring, assessments and maintenance – LINKS TO ICOLD TC / US NBG TC

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Chapter 8 – Inspection, monitoring, assessments and maintenance – LINKS TO ICOLD TC

Technical Committee Co-operate Priority Action Notes

E EMBANKMENT DAMS (2017-20) Yes H Ongoing action H DAM SAFETY (2015-18) Yes H Review bulletins and other publications before contacting

Make contact at Vienna - RT Common members in both TCs

Q DAM SURVEILLANCE (2017-21) Yes H Review bulletins and other publications before contacting Make contact at Vienna - RT

S FLOOD EVALUATION AND DAM SAFETY (2015-18) Yes H Review bulletins and other publications for material that - can use, - cannot use, - use with adaptation Make contact at Vienna - RT

An important TC to link

N PUBLIC AWARENESS AND EDUCATION (2015-18) Yes L Initial contact to confirm what TC want from Levee TC for potential publication eg lead times,

TC co-ordinates public relations.

O WORLD REGISTER OF DAMS AND DOCUMENTATION (2017-20) Yes L No current action Not necessarily to create a database

A COMPUTATIONAL ASPECTS OF ANALYSIS AND DESIGN OF DAMS (2017-20)

Yes M Review focus of TC. Are they working on embankment dams? Contact Ignacio and Frossard - RT

High priority to investigate if should link with the TC

B SEISMIC ASPECTS OF DAM DESIGN (2017-20) Yes M Review bulletins and other publications for applicability before contacting

High priority to investigate if should link with the TC

G ENVIRONMENT (2017-20) Yes M Explore TC activities, review bulletins. Encourage TC to incorporate levee activities (possible quick win)

M OPERATION, MAINTENANCE AND REHABILITATION OF DAMS (2017-20)

Yes M Explore TC activities, review bulletins.

P CEMENTED MATERIAL DAMS (2017-20) Yes M Review focus of TC Contact TC and encourage to include Levees in TC scope

T PROSPECTIVE AND NEW CHALLENGES FOR DAMS AND RESERVOIRS IN THE 21st CENTURY (2017-20) (AD HOC Committee)

Yes M Keep in contact Already connecting with this TC

U DAMS AND RIVER BASIN MANAGEMENT (2015-18) Yes M No current action Involve TC when we start on system work

Y CLIMATE CHANGE (2014-17) Yes M Review focus of TC

Chapter 8 – Inspection, monitoring, assessments and maintenance – US NBG TC

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Chapter 9 – Emergency management (Lead ???)

• Chapter 9: Emergency management

• 9.1 Examples of actual failures of dams and levees • 9.2 Emergency management


Chapter 9 – Emergency management – key issues

•  Focus on emergency management of the structures themselves (not the hinterland)

•  Dam and levee breaching processes. •  Accidental vs deliberate breaching

•  Common or potentially common issues •  Spillway / overtopping management

•  Key differences •  Degree of permanence of loading

•  Flood and earthquake issues •  Reservoir drawdown vs surface protection •  Intensity of breach vs complexity of multiple breaches •  Role of volunteers in management

•  Knowledge transfer issues •  Emergency management procedures for levees applicable to small dams


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Chapter 10 (Leads Jonathan / Rémy)

• Chapter 10: Conclusions and recommendations

•  To be added after having a complete draft. Aim (and scope) and key messages / key outcomes must be clearly highlighted. Best is to separate conclusions and recommendations (separate sections?) and to clearly highlight the main key messages before mentioning a list of messages-per-chapter. Perhaps also add some key tables or diagrams if these help to summarize the results. For recommendations, please also consider the spin-off that might results from this report.

•  Potential key messages that may (or may not – depending on the contents of the report) appear in this Chapter:

•  Main Key message: Dams and levees have a significant number of similarities regarding the structure and their functions and management, but also a fair number of differences. The latter may provide lessons for levees and dams.

•  Further suggested general highlights and key messages: •  areas of levee knowledge having added value for the dam community •  areas where dam knowledge may or may not be directly applicable to levees, or where dam and levee

terminology do not match •  key areas where the Levee Committee should aim to co-operate with other ICOLD Committees •  areas where dam and levee terminology do not match (check section 2.1- link with disciussion on glossary)


General discussion – headline issues

• Key principles, hierarchies, frameworks •  visualisation

• Transferrable ideas: dams ↔ levees • Key issues for discussion with other ICOLD TCs:


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Organisational issues (whole report / all chapters)

• Method /timing for linking with other TCs • Analysis of existing bulletins and their relevance to levees

•  Comprehensive list of bulletins? • Chapter team meetings (teleconference/ physical?)

•  Need for such meetings before the end of the year (to be taken into account in the core group workshop in January 2020

• Meetings between Ch leads and Report leads – planning


Conclusions - Planning

•  We need to have a final draft ready for the New Delhi 2020 ICOLD meeting •  Chapter teams have to work under the active coordination of chapter leads •  Need for a detailed planning soon from all chapter teams •  Workshop (teleconference) in September / October with all chapter leads

for updating and finalizing the planning •  Regular contact between chapters and report leads •  Workshop in Crete (EUCOLD symposium) on 1st October 2019. agenda

will depend on attendance (need for a doodle) •  Workshop of core group on 21-22 January 2020 •  April 2020 New Delhi meeting – Fist complete draft of the report for review

by the whole TC


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Lunch break

• Please be here on time this afternoon at 13:30 We have many interesting presentations and discussions this afternoon (ends at 16:30)

• Bon appétit and good discussions during this lunch break (12:00-13:30)


icold technical committee on levees (le tc)

Documents