Inside the Spillway: Radial Gate Opened for Major Repair

Introduction Dams play a crucial role in water management, hydroelectric power generation, and flood control. However, maintaining their efficiency requires regular inspection and repairs. Recently, one of the radial gates of our dam spillway was opened for an essential maintenance operation, revealing an inside look at the massive steel structure that controls water flow.

Why the Repair Was Needed Over time, constant exposure to high-pressure water, sediment abrasion, and structural loads can cause wear and tear on spillway gates. In this case, engineers identified surface corrosion, concrete damage at the spillway apron, and minor leakage, necessitating urgent rehabilitation.

The Repair Process

1. Gate Deactivation: Before any work could begin, the radial gate was safely deactivated, with upstream water levels carefully managed to prevent uncontrolled releases.
2. Structural Inspection: A team of engineers and hydropower specialists conducted a thorough structural assessment, checking for rust accumulation, seal damage, and mechanical integrity.
3. Concrete Restoration: The eroded spillway apron, visible in the images, needed reinforcement. Damaged sections were cut out, and new high-strength concrete was poured to restore stability.
4. Gate Sealing & Lubrication: The radial gate’s seals were replaced to prevent leakage, and moving parts were lubricated to ensure smooth operation.
5. Final Testing: Once repairs were complete, the gate was tested multiple times to ensure it could operate seamlessly under load conditions.

Challenges Faced Working in a spillway presents multiple challenges, including limited accessibility, the presence of residual water, and the need for precision engineering. Heavy machinery was brought in to assist with concrete repairs, while divers and technicians worked closely to examine submerged areas.

Impact on Hydropower & Water Management A malfunctioning spillway gate can lead to inefficient reservoir operation, unplanned water releases, and even safety concerns. This repair not only ensures the continued reliability of the hydropower plant but also improves flood management by guaranteeing controlled water discharge during high inflows.

Conclusion The opening of a radial spillway gate for maintenance is a rare and challenging event, offering valuable insights into dam engineering. These efforts help sustain the longevity and efficiency of the dam, ensuring optimal water resource management for years to come.