Rail Culvert Replacement Design - Echuca to Deniliquin Line
Sterling delivered the complete Issued for Construction design package for replacement of a deteriorated eleven-span timber rail bridge with precast concrete box culverts on V/Line's Echuca to Deniliquin corridor, achieving 50% improved waterway capacity.
Challenge
The existing Bridge ECHDQN-BR-243258 at chainage 243.258km was a 31.135m timber structure at end of life, requiring full replacement. Site inspection revealed typical concrete deck spalling, erosion at the piers, decayed timber sleepers, and cracking in mass concrete substructure elements. The bridge crossed a designated waterway within the Murray River floodplain, requiring coordination with multiple regulatory authorities including Murray River Council, WaterNSW, and NSW Department of Planning and Environment.
Solution
Sterling developed a precast concrete box culvert design founded on 300mm thick 3% cement stabilised Class 2 crushed rock to 98% compaction. The hydraulic design utilised TUFLOW modelling from the Echuca Moama Flood Study (2024) to assess flood behaviour and ensure compliance with V/Line freeboard requirements. Geotechnical investigations confirmed 200 kPa bearing capacity on stiff to hard clay at 1.5m depth. The design addressed track stiffness transitioning, scour protection, headwalls, wingwalls, and apron slabs in accordance with V/Line standards.
Deliverables
Complete Issued for Construction design package including structural drawings, hydraulic assessment report, geotechnical investigation findings, Safety in Design register, and regulatory approval documentation. The design progressed through Concept, Preliminary and Final Design stages per V/Line's design management procedures. Engineering Change Notices and Requests for Information were managed throughout the design development process.
Outcome
The replacement design increased waterway flow area by 50% from 39.73m² to 59.64m² with 33m clear span and 1.83m clear depth. Murray River Council issued formal design approval in May 2025. The standardised precast solution eliminated structural defects while providing improved flood conveyance capacity and reduced long-term maintenance requirements for this single-track broad gauge passenger line.
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