Nanumaga Detailed Design Report - Report No. P19012_DetailedDesign_NGA_R1 - Draft

Oct 29, 2026

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Nanumaga Detailed Design Report for the Tuvalu Coastal Adaptation Project prepared under the United Nations Development Programme (UNDP) sets out the design basis, coastal protection works, and implementation approach. The draft report (Report No: P19012_DetailedDesign_NGA_R1 .00, Version 1.0 dated 18/03/21) documents acknowledgements, design life assumptions for maritime structures, and key inputs for the berm top barrier concept using geosynthetic mega containers. It also outlines drainage, borrow areas, boat ramp components, governance and procurement, and includes C-ESMP and appendices with coastal protection IFC drawings and safety in design assessment.

LanguageEnglish

CategoryResearch & Report

FormatPDF

Pages51

Reading Time2 h 9 min

AccessFree to download

1. INTRODUCTION

1.1 General

1.2 Project and report objectives

1.3 Report background

1.4 Report outline

2. BASIS OF DESIGN

2.1 Design Life

2.2 Design event

2.3 Site

2.4 Design inputs

3. COASTAL PROTECTION DESIGN

3.1 Overview

3.2 Structure details

3.3 Drainage

3.4 Borrow areas

3.5 Boat ramp

4. PROJECT IMPLEMENTATION

4.1 General

4.2 Project governance and oversight

4.3 Procurement strategy

4.4 Contract delivery

4.5 Construction Environmental and Social Management Plan (C-ESMP)

5. SUMMARY AND RECOMMENDATIONS

5.1 Summary

5.2 Recommendations

6. REFERENCES

Appendix A: Nanumaga Coastal Protection IFC Drawings

Appendix B: Nanumaga Coastal Protection Bill of Quantities

Appendix C: TCAP Safety in Design Assessment

United Nations Development Program Nanumaga Detailed Design Report Tuvalu Coastal Adaptation Project 12 March 2021 Report No: P19012_DetailedDesign_NGA_R1 .00 Document Summary Document Title Project Name Client Report No. Nanumaga Detailed Design Report Tuvalu Coastal Adaptation Project United Nations Development Program P19012_DetailedDesign_NGA_R1 .00 Document History Version Date 1.0 18/03/21 Author(s) James Lewis Reviewer(s) Artur Webb Status DRAFT Signature Acknowledgements The support of the Government of Tuvalu, in particular the Department of Lands and Survey, under the direction of Faatasi Malologa is gratefully acknowledged. We wish to express our sincere thanks to the Nanumaga Kaupule for their support and assistance. The design development benefited greatly from the valuable guidance and support of Alan Resture, Jone Feresi, Paul Audin, Puanita Ewekia and especially Dr. Arthur Webb, whose extensive knowledge of the Tuvaluan islands and their vulnerabilities gave birth to the concepts underpinning the Tuvalu Coastal Adaptation Project . We wish to acknowledge the people of Nanumaga for their warm hospitality during our time in Tuvalu Table of Contents 1. INTRODUCTION .............................................................................................................. 1 1.1 General................................................................................................................... 1 1.2 Project and report objectives .................................................................................. 1 1.3 Report background ................................................................................................. 2 1.4 Report outline ......................................................................................................... 2 2. BASIS OF DESIGN.......................................................................................................... 3 2.1 Design Life ............................................................................................................. 3 2.2 The Australian Standard Guidelines for the design of maritime structures (AS 4997- 2005) specifically excludes the design of “coastal engineering structures such as rock armoured walls, groynes, etc.” The Berm Top Barrier design presented in the Concept Design Report adopts buried geosynthetic mega containers (GMC) for the core of the structure. Geotextile containers were originally expected to have a service life of at least 25 years in their earlier design iterations. Improvements in geosynthetics have been reported to have design lives exceeding 40 years (Bettington, 2018) . This has been adopted as the design life of the BTB structure. Design event .......................................................................................................... 3 2.3 Site ......................................................................................................................... 3 2.4 Design inputs.......................................................................................................... 7 3. COASTAL PROTECTION DESIGN ............................................................................... 12 3.1 Overview .............................................................................................................. 12 3.2 Structure details .................................................................................................... 12 3.3 Drainage ............................................................................................................... 14 3.4 Borrow areas ........................................................................................................ 14 3.5 Boat ramp ............................................................................................................. 16 4. PROJECT IMPLEMENTATION.........................................................

FAQs

What is the purpose of the Nanumaga detailed design report?

It provides the detailed design basis and coastal protection design for the Tuvalu Coastal Adaptation Project, and specifies how the project will be implemented, including governance and environmental/social management planning.

What design life assumptions are used for the berm top barrier structure?

The report adopts an overall design life for the berm top barrier based on improvements in geosynthetics, referencing design lives reported to exceed 40 years.

What topics are covered under the coastal protection design section?

The section includes an overview, structure details, drainage, borrow areas, and the boat ramp, along with supporting design inputs.

Oct 29, 2026

Upload by Aditya