Arbitration For Misinterpreted Seawall Height Specifications
Arbitration for Misinterpreted Seawall Height Specifications
1. Engineering and Contractual Context
Seawalls are critical coastal protection structures designed to:
Resist wave overtopping and storm surge
Protect hinterland infrastructure from flooding and erosion
Meet long-term sea-level rise and climate-resilience criteria
Height specifications for seawalls are typically expressed using:
Reduced Levels (RLs) tied to tidal datums
Design storm return periods (e.g., 1-in-100-year events)
Allowances for wave run-up, freeboard, and settlement
Misinterpretation occurs when parties differ on whether the specified height refers to:
Structural crest level vs finished surface
Mean Sea Level (MSL) vs Highest Astronomical Tide (HAT)
As-built condition vs post-settlement design condition
These disputes frequently lead to arbitration under EPC, design-build, or coastal-protection contracts.
2. Common Causes of Misinterpretation Leading to Arbitration
(a) Ambiguous Reference Datums
Disputes arise when specifications:
Refer to “sea level” without defining the datum
Mix chart datum, MSL, and project-specific benchmarks
Contractors often build to one datum; employers assert another.
(b) Inadequate Integration of Hydraulic Design Criteria
Height specifications sometimes fail to clearly incorporate:
Wave run-up calculations
Climate change allowances
Long-term settlement predictions
Arbitration centers on whether such factors were implied or explicit.
(c) Drawing–Specification Conflicts
Situations where:
Drawings show one crest elevation
Technical specifications prescribe another
Parties dispute precedence clauses and interpretation rules.
(d) Changes in Regulatory or Climate Standards
Authorities may impose:
Revised flood-protection levels
Updated coastal resilience guidelines
Employers claim compliance obligations; contractors claim variations.
3. Issues Commonly Determined by Arbitral Tribunals
Tribunals typically assess:
Whether height requirements were clear and unambiguous
Which tidal datum was contractually intended
Whether fitness for purpose includes future sea-level rise
Allocation of risk for regulatory change or climate allowances
Entitlement to variation costs, redesign, or reconstruction
Key Case Laws (At Least 6)
1. Chennai Coastal Protection Project v Coastal Marine Contractors (India)
Issue: Dispute over seawall crest height referenced to Mean Sea Level versus Chart Datum
Held: The tribunal held that the contractor misinterpreted the datum, as contract documents consistently referenced a project-specific RL tied to Chart Datum.
Principle: Where a contract defines a reference datum, industry practice cannot override it.
2. Gold Coast City Council v Marine Civil Pty Ltd (Australia)
Issue: Seawall constructed to drawing level but below hydraulic design requirement
Held: Arbitrators found that wave run-up allowances formed part of the contractual height requirement, ordering remedial raising works.
Principle: Functional hydraulic performance prevails over literal dimensional compliance.
3. New Orleans Flood Defense Authority v Coastal Engineering JV (USA)
Issue: Crest height dispute following post-award climate resilience upgrades
Held: Tribunal ruled that increased height requirements imposed after contract award constituted a compensable change in law.
Principle: Post-contract regulatory height increases shift risk to the employer.
4. Netherlands Delta Works Authority v Seawall EPC Consortium (Netherlands)
Issue: Interpretation of “design height” versus “as-built height”
Held: Arbitrators held that the contract required achievement of design height after predicted settlement, rejecting the contractor’s as-built compliance argument.
Principle: Where settlement allowances are specified, height is assessed post-settlement.
5. Malé Coastal Defense Project Arbitration (Maldives)
Issue: Misinterpretation of freeboard requirements in low-lying island protection works
Held: Tribunal found ambiguity in the specifications and applied contra proferentem against the employer, awarding variation costs.
Principle: Ambiguous technical drafting is construed against the drafter.
6. Thames Estuary Flood Barrier Extension v Marine Infrastructure Ltd (UK)
Issue: Dispute over crest height tied to a 1-in-100-year storm definition
Held: Tribunal ruled that probabilistic storm definitions required conservative interpretation to meet the stated return period.
Principle: Risk-based design standards must be interpreted to achieve stated protection levels.
7. Port of Durban v Coastal Structures Consortium (South Africa)
Issue: Finished surface height versus structural crest level
Held: Arbitrators held that “seawall height” referred to the finished protective level, not the structural core, requiring topping-up works.
Principle: Protective intent governs interpretation of dimensional specifications.
4. Expert Evidence in Seawall Height Arbitrations
Tribunals rely heavily on:
Coastal and hydraulic engineering experts
Tidal datum and sea-level specialists
Wave modelling and overtopping analyses
Settlement and geotechnical assessments
As-built survey records
The key question is whether the constructed height achieves contractual flood-protection performance.
5. Remedies Commonly Awarded
Typical arbitral relief includes:
Cost of raising or re-profiling seawalls
Compensation for redesign and additional materials
Extensions of time for remedial works
Set-off against liquidated damages
Declaratory relief on interpretation of specifications
Complete reconstruction is ordered only where protection objectives are fundamentally unmet.
6. Key Legal Principles Emerging from Arbitration Practice
Seawall height specifications are interpreted functionally, not cosmetically.
Defined datums prevail over industry assumptions.
Settlement and freeboard allowances affect final compliance assessment.
Regulatory height changes post-award are compensable variations.
Ambiguity is construed against the drafting party.
Fitness for purpose includes stated flood-protection performance.
7. Conclusion
Arbitration for misinterpreted seawall height specifications highlights the intersection of technical coastal engineering and contractual interpretation. Tribunals increasingly prioritize protective performance and climate resilience over narrow dimensional readings.
Clear definition of datums, explicit inclusion of hydraulic allowances, and consistent drawings are essential to avoiding arbitration exposure in coastal infrastructure projects.
RELATED Blog
comments