U.S. Fish & Wildlife Service Low Hazard Dams - Association of State ...

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U.S. Fish & Wildlife Service Low Hazard Dams - Association of State ...

STANDING OPERATING PROCEDURESProblemProbable Cause andPossible ConsequencesRecommended ActionsTrashrack missing or damaged.Gate will not close. Gate or stemmay be damaged in effort to closegate.Raise and lower gate slowly untildebris is loosened and floats pastvalve. When reservoir is lowered,repair or replace trashrack.Ice action, rust, affect vibration, orstress resulting from forcing gateclosed when it is jammed.Gate-leaf main fail completely,evacuating reservoir.Use valve only in fully open or closedposition. Minimize use of valve untilleaf can be repaired or replaced.Rust, erosion, cavitation, vibrationor wear.Leakage and loss of support for gateleaf. Gate may bind in guides andbecome inoperable.Minimize use of valve until guides orseats can be repaired. If cavitation isthe cause, check to see if air vent pipeexists, and is unobstructed.Revision No. 0B-26 October 2008

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