Dam Flap Gate Opened to remove floating debris.

The cloud burst upstream resulted in an extraordinary amount of debris accumulating in the reservoir. This excess debris posed a significant risk to the dam's structural integrity by exerting additional pressure. Given the urgency of the situation and the vast quantity of debris, capturing and removing it within a reasonable timeframe was not feasible.

As a result, the decision was made to utilize the flap gates to flush the debris downstream. This is a standard procedure designed to mitigate such risks and protect the dam. While this approach may temporarily displace the problem, it's essential to implement long-term solutions to prevent future accumulation and minimize the impact on downstream areas.

A flap gate consists of a straight or curved retaining surface pivoted on a fixed axis at the sill. When designed with a fish-belly-shaped leaf, it offers exceptional resistance to torsion, making it operable from one end for spans up to 20 meters. The closed-shell structure enhances its durability, with rigidly anchored bearings spaced between 2.5 to 4 meters. In the fully raised position, the flap gate forms an angle of 60 to 70 degrees with the horizontal. When fully lowered, the skin plate aligns seamlessly with the weir bottom, creating an unobstructed surface for water flow.

Flap gates provide excellent operational flexibility, enabling: Efficient Passage of Ice and Floating Material like debris and logs

Similar to drum and sector gates, water flows over the flap gate when it is open. Seals are installed along the lower edge and sides of the gate leaf for effective water retention. The lower seal may use a rubber strip secured to the sill and skin plate or align with the cylindrical surface of the skin plate’s lower section, often protected by a cover plate to ensure durability and functionality.
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