Culvert & Drainage System

This comprehensive drainage infrastructure project encompassed the design and construction of a 2.5-kilometer concrete culvert and channel network, engineered to address chronic flooding issues in a low-lying agricultural and residential area. The system was designed to handle peak flow rates of 15 cubic meters per second during monsoon conditions.

The project included multiple box culvert crossings under existing roadways, open trapezoidal channels with reinforced concrete lining, sedimentation basins, and outlet structures discharging into the main river system. The culvert system featured reinforced concrete box sections (2.0m x 1.5m) designed for HS-20 traffic loading where required.

As Site Supervisor, I directed field operations and ensured the technical execution matched design specifications. My key responsibilities included:

• Establishing accurate longitudinal and cross-sectional leveling for proper hydraulic gradient
• Supervising excavation works and ensuring proper soil compaction in trench backfill zones
• Coordinating concrete placement for culvert sections and ensuring proper curing protocols
• Managing water flow during construction to maintain partial system functionality
• Verifying reinforcement placement and concrete cover requirements for durability
• Conducting as-built surveys and preparing completion documentation
• Coordinating with local authorities for environmental compliance and discharge permits

Challenge 1: Maintaining Drainage During Construction
The existing drainage system needed to remain partially operational during the upgrade to prevent flooding of adjacent properties. We implemented a temporary bypass channel system using corrugated steel pipes and pump stations, maintaining 60% flow capacity throughout the construction period.

Challenge 2: High Groundwater Table
Excavation depths for culvert foundations encountered groundwater at 1.5 meters below surface. We employed well-point dewatering systems with submersible pumps, maintaining dry working conditions while continuously monitoring discharge water quality for environmental compliance.

Challenge 3: Sediment Accumulation Design
Historical data indicated high sediment loads during storm events. We incorporated strategically placed sedimentation basins with removable weir systems, allowing periodic cleaning access while maintaining continuous flow capacity during normal conditions.