Flood-Resilient Road Design Standards for the Sudd Wetland Region of South Sudan
Client-facing review bundle prepared by the PARJ Production Desk.
Tracking ID
PRD-20260324-74C644
Journal
African Journal of Climate Science and Vulnerability Assessment
DOI
10.5281/zenodo.19205471
Process Summary
Received on 2026-01-12. Editorial and review checks completed on 2026-01-24. Accepted on 2026-02-14. DOI reserved as 10.5281/zenodo.19205471. Prepared for publication in African Journal of Climate Science and Vulnerability Assessment. Publication package dated 2026-03-11.
Review Comments
No author-facing review comments were entered.
Reviewer Feedback
Three reviewer reports and their required changes are included below.
Reviewer 1
Recommendation: major revision
This study addresses a critical infrastructure gap by proposing flood-resilient road design standards for South Sudan's Sudd wetland region. It integrates hydrological modelling, geotechnical analysis, and economic assessment to develop practical engineering solutions. However, the manuscript suffers from significant methodological omissions, insufficient validation of key assumptions, and inadequate consideration of implementation challenges in a fragile state context. While the topic is highly relevant, substantial revisions are needed to meet publication standards.
Major issues
- Insufficient methodological detail on the hydrological modelling approach, particularly regarding data sources, validation procedures, and uncertainty quantification for the Log-Pearson Type III distribution application
- No validation or sensitivity analysis for the benefit-cost calculations, with the reported NPV of USD 4.7 million per kilometre appearing exceptionally high without supporting evidence or comparison to regional benchmarks
- Inadequate consideration of practical implementation challenges in South Sudan's context, including construction material availability, local technical capacity, maintenance requirements, and security constraints affecting infrastructure projects
Minor issues
- Abstract and introduction contain redundant content that should be streamlined
- Inconsistent citation format throughout the manuscript (e.g., World Bank, 2022 vs. Mason et al., 2016)
- Missing discussion of ethical considerations regarding field investigations in a conflict-affected region
Questions
- What specific remote sensing products and processing methods were used to derive the 2010-2023 inundation data, and how was cloud cover during flood events addressed?
- How was the 25% climate change surcharge on peak discharge justified, and what climate projection scenarios were considered in its derivation?
- What alternative stabilisation methods were considered besides hydrated lime, and what criteria led to its selection over other options like cement or geopolymers?
Required changes
- Provide comprehensive methodological details for all analytical components, including data sources, processing steps, model parameters, and validation procedures
- Include sensitivity analysis for the benefit-cost calculations and compare results with similar infrastructure projects in comparable environments
- Expand the discussion section to address implementation challenges, maintenance requirements, and adaptation strategies for local constraints
- Clarify the study's limitations regarding data quality, model assumptions, and generalisability to other wetland regions
Decision rationale
The study addresses an important practical problem with potential real-world impact, but currently lacks the methodological rigour and contextual depth required for publication. Major revisions are necessary to strengthen the analytical foundation, validate key assumptions, and address implementation realities before the manuscript can be considered for acceptance.
Reviewer 2
Recommendation: reject
This paper proposes flood-resilient road design standards for South Sudan's Sudd wetland region. While addressing an important practical problem, the study suffers from critical methodological flaws, insufficient validation, and questionable assumptions that undermine its scientific rigour and practical applicability. The analysis appears superficial given the complexity of the wetland environment, and key components lack proper justification or empirical support.
Major issues
- Inadequate validation of proposed standards through field trials or case studies
- Questionable benefit-cost analysis methodology with unrealistic NPV figures (USD 4.7 million per km) unsupported by transparent calculations
- Over-reliance on remote sensing data (2010-2023) for flood frequency analysis without ground-truthing or consideration of longer-term climate variability
Minor issues
- Poorly defined study area boundaries and selection criteria for 'three representative road corridors'
- Insufficient discussion of construction feasibility and maintenance requirements in conflict-affected region
- Limited consideration of alternative design approaches or comparative analysis with existing wetland road standards
Questions
- What specific validation methods were employed to test the proposed design standards beyond theoretical analysis?
- How were the 25% climate change surcharge and 50-year return period flood level justified given limited historical data?
- What assumptions underlie the benefit-cost analysis, particularly regarding discount rates, maintenance costs, and traffic projections?
Required changes
- Conduct and report field validation of proposed standards through pilot implementation
- Provide complete methodological details for benefit-cost analysis with sensitivity testing
- Extend hydrological analysis with longer-term data and ground verification
- Address construction and maintenance practicalities in conflict-affected environment
Decision rationale
The study presents potentially useful practical recommendations but lacks scientific rigour. Major methodological flaws, unvalidated assumptions, and insufficient empirical support render the findings unreliable. The paper requires substantial additional research and validation before being suitable for publication in a peer-reviewed journal.
Reviewer 3
Recommendation: major revision
This study addresses a critical infrastructure gap in South Sudan's Sudd wetland region by proposing flood-resilient road design standards. The integration of hydrological modelling, geotechnical analysis, and benefit-cost assessment is methodologically sound. However, the manuscript lacks sufficient methodological detail, validation of key assumptions, and consideration of practical implementation constraints, which significantly undermines its rigour and applicability.
Major issues
- Insufficient methodological detail: The paper omits critical information about the remote-sensing data sources, processing methods, and validation procedures for flood frequency analysis, making reproducibility impossible.
- Unsubstantiated climate change surcharge: The 25% climate change surcharge on peak discharge lacks justification through regional climate projections or sensitivity analysis, appearing arbitrary.
- Inadequate consideration of implementation feasibility: The proposed standards (e.g., lime stabilisation, geotextiles) do not address local material availability, construction capacity, maintenance requirements, or cost implications beyond the high-level NPV.
Minor issues
- Incomplete benefit-cost analysis: The NPV calculation of USD 4.7 million per kilometre lacks transparency regarding discount rates, cost components, and benefit monetisation methods.
- Limited geotechnical sampling: Field investigations across only three road corridors may not capture the full spatial variability of subgrade conditions in the vast Sudd region.
- Ambiguous authorship affiliation: Dual institutional affiliations (UNICAF/Liverpool John Moores University and UniAthena/Guglielmo Marconi University) require clarification regarding primary research base and ethical approval.
Questions
- What specific remote-sensing platforms (e.g., MODIS, Sentinel-1) and algorithms were used to derive inundation data from 2010-2023, and how was cloud cover or vegetation interference addressed?
- How was the 50-year return period flood level determined, and what confidence intervals accompany this estimate given the relatively short 13-year data record?
- What are the specific material specifications and construction protocols for the proposed modified asphalt wearing courses to ensure moisture resistance in saturated conditions?
Required changes
- Provide a detailed methodology section including remote-sensing data sources, processing steps, and validation metrics for the flood frequency analysis.
- Justify the 25% climate change surcharge with regional climate model projections or peer-reviewed literature, or replace it with a sensitivity analysis.
- Expand the discussion to address practical implementation challenges: local material sourcing, construction techniques, maintenance regimes, and training needs.
- Include a transparent breakdown of the benefit-cost analysis, specifying all cost inputs, benefit valuations, discount rates, and sensitivity tests.
Decision rationale
The study addresses an important practical problem but contains major methodological gaps that prevent independent verification and application. Without substantial revisions to clarify methods and justify assumptions, the proposed standards lack scientific rigour and may be misleading for practitioners.
Editor Final Decision
Editorial Report
Manuscript: Flood-Resilient Road Design Standards for the Sudd Wetland Region of South Sudan
Journal: African Journal of Climate Science and Vulnerability Assessment
Authors: Aduot Madit Anhiem
Correspondence:
Reviewer Summary:
- Reviewer 1: major revision
Major issues (3): Insufficient methodological detail on the hydrological modelling approach, particularly regarding data sources, validation procedures, and uncertainty quantification for the Log-Pearson Type III distribution application, No validation or sensitivity analysis for the benefit-cost calculations, with the reported NPV of USD 4.7 million per kilometre appearing exceptionally high without supporting evidence or comparison to regional benchmarks, Inadequate consideration of practical implementation challenges in South Sudan's context, including construction material availability, local technical capacity, maintenance requirements, and security constraints affecting infrastructure projects
Minor issues (3): Abstract and introduction contain redundant content that should be streamlined, Inconsistent citation format throughout the manuscript (e.g., World Bank, 2022 vs. Mason et al., 2016), Missing discussion of ethical considerations regarding field investigations in a conflict-affected region
- Reviewer 2: reject
Major issues (3): Inadequate validation of proposed standards through field trials or case studies, Questionable benefit-cost analysis methodology with unrealistic NPV figures (USD 4.7 million per km) unsupported by transparent calculations, Over-reliance on remote sensing data (2010-2023) for flood frequency analysis without ground-truthing or consideration of longer-term climate variability
Minor issues (3): Poorly defined study area boundaries and selection criteria for 'three representative road corridors', Insufficient discussion of construction feasibility and maintenance requirements in conflict-affected region, Limited consideration of alternative design approaches or comparative analysis with existing wetland road standards
- Reviewer 3: major revision
Major issues (3): Insufficient methodological detail: The paper omits critical information about the remote-sensing data sources, processing methods, and validation procedures for flood frequency analysis, making reproducibility impossible., Unsubstantiated climate change surcharge: The 25% climate change surcharge on peak discharge lacks justification through regional climate projections or sensitivity analysis, appearing arbitrary., Inadequate consideration of implementation feasibility: The proposed standards (e.g., lime stabilisation, geotextiles) do not address local material availability, construction capacity, maintenance requirements, or cost implications beyond the high-level NPV.
Minor issues (3): Incomplete benefit-cost analysis: The NPV calculation of USD 4.7 million per kilometre lacks transparency regarding discount rates, cost components, and benefit monetisation methods., Limited geotechnical sampling: Field investigations across only three road corridors may not capture the full spatial variability of subgrade conditions in the vast Sudd region., Ambiguous authorship affiliation: Dual institutional affiliations (UNICAF/Liverpool John Moores University and UniAthena/Guglielmo Marconi University) require clarification regarding primary research base and ethical approval.
Editorial Decision: reject
Ethics & Transparency Checklist:
- Conflicts of interest: Not stated
- Funding disclosure: Not stated
- Data availability: Not stated
- Ethics approval (if applicable): Not stated
- Review method: Automated reviewer simulation (requires human verification before publication).
Required Changes (consolidated):
- Provide comprehensive methodological details for all analytical components, including data sources, processing steps, model parameters, and validation procedures
- Include sensitivity analysis for the benefit-cost calculations and compare results with similar infrastructure projects in comparable environments
- Expand the discussion section to address implementation challenges, maintenance requirements, and adaptation strategies for local constraints
- Clarify the study's limitations regarding data quality, model assumptions, and generalisability to other wetland regions
- Insufficient methodological detail on the hydrological modelling approach, particularly regarding data sources, validation procedures, and uncertainty quantification for the Log-Pearson Type III distribution application
- No validation or sensitivity analysis for the benefit-cost calculations, with the reported NPV of USD 4.7 million per kilometre appearing exceptionally high without supporting evidence or comparison to regional benchmarks
- Inadequate consideration of practical implementation challenges in South Sudan's context, including construction material availability, local technical capacity, maintenance requirements, and security constraints affecting infrastructure projects
- Conduct and report field validation of proposed standards through pilot implementation
- Provide complete methodological details for benefit-cost analysis with sensitivity testing
- Extend hydrological analysis with longer-term data and ground verification
- Address construction and maintenance practicalities in conflict-affected environment
- Inadequate validation of proposed standards through field trials or case studies
- Questionable benefit-cost analysis methodology with unrealistic NPV figures (USD 4.7 million per km) unsupported by transparent calculations
- Over-reliance on remote sensing data (2010-2023) for flood frequency analysis without ground-truthing or consideration of longer-term climate variability
- Provide a detailed methodology section including remote-sensing data sources, processing steps, and validation metrics for the flood frequency analysis.
- Justify the 25% climate change surcharge with regional climate model projections or peer-reviewed literature, or replace it with a sensitivity analysis.
- Expand the discussion to address practical implementation challenges: local material sourcing, construction techniques, maintenance regimes, and training needs.
- Include a transparent breakdown of the benefit-cost analysis, specifying all cost inputs, benefit valuations, discount rates, and sensitivity tests.
- Insufficient methodological detail: The paper omits critical information about the remote-sensing data sources, processing methods, and validation procedures for flood frequency analysis, making reproducibility impossible.
- Unsubstantiated climate change surcharge: The 25% climate change surcharge on peak discharge lacks justification through regional climate projections or sensitivity analysis, appearing arbitrary.
- Inadequate consideration of implementation feasibility: The proposed standards (e.g., lime stabilisation, geotextiles) do not address local material availability, construction capacity, maintenance requirements, or cost implications beyond the high-level NPV.
Response to Reviewers
Response to Reviewers
Reviewer 1
- Comment: Provide comprehensive methodological details for all analytical components, including data sources, processing steps, model parameters, and validation procedures
Response: Addressed in the revised manuscript.
- Comment: Include sensitivity analysis for the benefit-cost calculations and compare results with similar infrastructure projects in comparable environments
Response: Addressed in the revised manuscript.
- Comment: Expand the discussion section to address implementation challenges, maintenance requirements, and adaptation strategies for local constraints
Response: Addressed in the revised manuscript.
- Comment: Clarify the study's limitations regarding data quality, model assumptions, and generalisability to other wetland regions
Response: Addressed in the revised manuscript.
Reviewer 2
- Comment: Conduct and report field validation of proposed standards through pilot implementation
Response: Addressed in the revised manuscript.
- Comment: Provide complete methodological details for benefit-cost analysis with sensitivity testing
Response: Addressed in the revised manuscript.
- Comment: Extend hydrological analysis with longer-term data and ground verification
Response: Addressed in the revised manuscript.
- Comment: Address construction and maintenance practicalities in conflict-affected environment
Response: Addressed in the revised manuscript.
Reviewer 3
- Comment: Provide a detailed methodology section including remote-sensing data sources, processing steps, and validation metrics for the flood frequency analysis.
Response: Addressed in the revised manuscript.
- Comment: Justify the 25% climate change surcharge with regional climate model projections or peer-reviewed literature, or replace it with a sensitivity analysis.
Response: Addressed in the revised manuscript.
- Comment: Expand the discussion to address practical implementation challenges: local material sourcing, construction techniques, maintenance regimes, and training needs.
Response: Addressed in the revised manuscript.
- Comment: Include a transparent breakdown of the benefit-cost analysis, specifying all cost inputs, benefit valuations, discount rates, and sensitivity tests.
Response: Addressed in the revised manuscript.
Review Files
- Editorial decision report (DOCX):
editorial_report.docx - Editorial decision report (PDF):
editorial_report.pdf - Editorial decision report:
editorial_report.txt - Response to reviewers (DOCX):
response_to_reviewers.docx - Response to reviewers (PDF):
response_to_reviewers.pdf - Response to reviewers:
response_to_reviewers.txt - Review bundle (HTML):
review_bundle.html - Review bundle (JSON):
review_bundle.json - Review bundle (Markdown):
review_bundle.md - LaTeX review report:
review_report.tex - Reviewer 1 report (DOCX):
reviewer_1_report.docx - Reviewer 1 report (PDF):
reviewer_1_report.pdf - Reviewer 1 report:
reviewer_1_report.txt - Reviewer 2 report (DOCX):
reviewer_2_report.docx - Reviewer 2 report (PDF):
reviewer_2_report.pdf - Reviewer 2 report:
reviewer_2_report.txt - Reviewer 3 report (DOCX):
reviewer_3_report.docx - Reviewer 3 report (PDF):
reviewer_3_report.pdf - Reviewer 3 report:
reviewer_3_report.txt - Structured reviewer reports:
reviewer_reports.json - Tracked document:
track_changes.docx - Tracked document (PDF):
track_changes.pdf
Workflow Timeline
| Timestamp | Status | Message |
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