raised valve stem for flood control gates above spillway structure into river |
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| navigate by keyword : valve stem raised backflow blocked bolted canal construction control dam design discharge drain drainage emergency engineering flood floodgate flow flowing gate industrial industry infrastructure level maintenance municipal open outfall pipe planning prevention rain rainfall reinforced river sewage sewer spillway storm stormwater stream structure stuck support system waste water waterway |
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| Engineering controls and gears to open and close flood gates |
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